.308 Winchester

[DocRDS]

SMK are usually around. Its not like finding varget (F*** Varget!). Midsouth has them right now.

I do wonder about some of you fellas and those super-heavy bullets. has anyone thrown them in a BC to see their benefits? I suspect lowlight is gonna be along to smack us all and tell us lighter and faster. 185 is about my limit before I need to pull out a magnum.

 

[rijndael]

I've got some 195 TMK laying around

195 TMKs ran great for me out of a factory 700. The long throat helped seat them longer. I used Varget, about the same amount as I used with the 195s.

 

[straightshooter1]

I used to really shoot a lot of the 155s. I switched to the 175 SMK and I'm just about out, and thinking about switching back again. Of course there are none available anywhere!

You might want to check out the 169 SMK's??? They've got a higher BC than the 175's at .527 and also they're also a longer bullet than the 175's. These 169 SMK's have been work very well for me with the same powder I use for the 168's and 175's. Many places have the 169's available and at a lower cost the either the 168's or 175's (why, I dunno . . . but these days I'm not going to argue for getting them under $200).

 

[Downzero]

You might want to check out the 169 SMK's??? They've got a higher BC than the 175's at .527 and also they're also a longer bullet than the 175's. These 169 SMK's have been work very well for me with the same powder I use for the 168's and 175's. Many places have the 169's available and at a lower cost the either the 168's or 175's (why, I dunno . . . but these days I'm not going to argue for getting them under $200).

I'll have to run some ballistic calculator information to figure out if these will be superior to the 155s. How are they in terms of seating depth sensitivity for you?

 

[straightshooter1]

I'll have to run some ballistic calculator information to figure out if these will be superior to the 155s. How are they in terms of seating depth sensitivity for you?

So far, in my experience I can see no difference from either the 168's or 175's. The 169's look to be like a hybrid ogive and definitely more forgiving than a secant ogive.

With the velocities I'm getting my ballistic calculator show it being stable out past 1200 yds. from the 1:10 Krieger 26" barrel.

 

[Downzero]

So far, in my experience I can see no difference from either the 168's or 175's. The 169's look to be like a hybrid ogive and definitely more forgiving than a secant ogive.

With the velocities I'm getting my ballistic calculator show it being stable out past 1200 yds. from the 1:10 Krieger 26" barrel.

I ran some numbers and while the new 169 is superior to the old school SMKs, the 155 is significantly superior to the new 169 in terms of performance, even if you assume as Brian Litz has shown that the 155 TMK has the same BC as the 155 (new) Palma bullet.

By "significantly," it's not quite 10%, but it's not trivial. If I could get a 500 pack of the 169s, I may give them a try. Bummed that they designed an entirely new bullet that doesn't actually perform better than one they already had, however.

 

[straightshooter1]

I ran some numbers and while the new 169 is superior to the old school SMKs, the 155 is significantly superior to the new 169 in terms of performance, even if you assume as Brian Litz has shown that the 155 TMK has the same BC as the 155 (new) Palma bullet.

By "significantly," it's not quite 10%, but it's not trivial. If I could get a 500 pack of the 169s, I may give them a try. Bummed that they designed an entirely new bullet that doesn't actually perform better than one they already had, however.

Plenty of 500 packs at Blue Collar Reloading: https://www.bluecollarreloading.com...ierra-30cal-169gr-hpbt?variant=39250057494626

 

[DJL2]

SMK are usually around. Its not like finding varget (F*** Varget!). Midsouth has them right now.

I do wonder about some of you fellas and those super-heavy bullets. has anyone thrown them in a BC to see their benefits? I suspect lowlight is gonna be along to smack us all and tell us lighter and faster. 185 is about my limit before I need to pull out a magnum.

I have been using essentially the same methodology Litz demonstrates in AB to compare bullets for a while. I had originally purchased these for a .30-06 when I couldn't find 208 ELD-M, thus why they're lying around.

With a "normal" rifle, there's the concern that COL eats your powder volume and you lose relative performance. I fully acknowledge that. However, if they "work" in your chamber and magazine setup, it comes down to what problem you're trying to solve. I would invite your attention to this article: https://rifleshooter.com/2016/11/si...k-load-development-308-winchester-and-varget/

While the comparison in that article clearly omits a number of very good projectiles, it does highlight the advantage of a more aerodynamic bullet at range.

 

[Downzero]

SMK are usually around. Its not like finding varget (F*** Varget!). Midsouth has them right now.

I do wonder about some of you fellas and those super-heavy bullets. has anyone thrown them in a BC to see their benefits? I suspect lowlight is gonna be along to smack us all and tell us lighter and faster. 185 is about my limit before I need to pull out a magnum.

My rifle is a 12 twist so I never tried it.

Although I do have plenty of Varget.

 

[DocRDS]

I have been using essentially the same methodology Litz demonstrates in AB to compare bullets for a while. I had originally purchased these for a .30-06 when I couldn't find 208 ELD-M, thus why they're lying around.

With a "normal" rifle, there's the concern that COL eats your powder volume and you lose relative performance. I fully acknowledge that. However, if they "work" in your chamber and magazine setup, it comes down to what problem you're trying to solve. I would invite your attention to this article: https://rifleshooter.com/2016/11/si...k-load-development-308-winchester-and-varget/

While the comparison in that article clearly omits a number of very good projectiles, it does highlight the advantage of a more aerodynamic bullet at range.

You SOB, I think you just made me buy a 1:10 308 twist barrel for that incoming AT-X.

I'll definatly check out the profiles in AB as I get more proficient. 308 is such an odd caliber anymore (or maybe I should say 'going through a transition')--When I scaled top projectiles from 223, 6, 6.5 up to 308 the corresponding weight was 190ish, but that convinced me I needed either 30-06 or 300 Win Mag to get the speed (Somehow I got it in my head you need to be between 2700-2900 FPS--which is probably something I heard but can't prove). Maybe 308 isn't dead yet. And despite my best efforts to be a manbun lover, the 308 bolt is still my best shooting rifle.

@Downzero Just gotta throw you some shade. I'm newer to reloading so I've never even seen a bottle of Varget. Even right before the pandemic when I started it was scarce. I've been surviving on 4064 and MR2000

 

[D̷e̷v̷i̷l̷D̷o̷c̷A̷Z̷]

You SOB, I think you just made me buy a 1:10 308 twist barrel for that incoming AT-X.

I'll definatly check out the profiles in AB as I get more proficient. 308 is such an odd caliber anymore (or maybe I should say 'going through a transition')--When I scaled top projectiles from 223, 6, 6.5 up to 308 the corresponding weight was 190ish, but that convinced me I needed either 30-06 or 300 Win Mag to get the speed (Somehow I got it in my head you need to be between 2700-2900 FPS--which is probably something I heard but can't prove). Maybe 308 isn't dead yet. And despite my best efforts to be a manbun lover, the 308 bolt is still my best shooting rifle.

@Downzero Just gotta throw you some shade. I'm newer to reloading so I've never even seen a bottle of Varget. Even right before the pandemic when I started it was scarce. I've been surviving on 4064 and MR2000

Funny. I too got bit by the 308w bug in the last scarce cycle. When things calm down again and everyone is fighting for Creedmoor stuff I’ll be alone and happy stacking 308w and the OG improved 308w……the 243w.

 

[DocRDS]

The FTR guys do pretty damn well with 18 pound 308's off of a bipod at 1000 yards.

I think that the most popular FTR load out there right now is a Berger 200.20x going around 2650 FPS in most cases.

Just for full caution in case any other inexperienced shooters are out there (like me)--those are not factory chambers. Trying to get that kind of load in a standard 308 may result in personal injury. I was reading up on this (see i do listen!) and I think the OAL was over 3 inches on some and they were using fairly long barrels of 28 to 32 inches. I think that was where my disconnect was--My experience was on 24" barrel with mag length seating, so i was like WTF are those velocities (150+ faster than the 195 SMK!!!) ...

 

[huntnh]

I should have picked up some 150 when it was available earlier in the week

 

[Downzero]

I think some if not all of that has been covered before in this thread, especially the freebore specs and loading long.

I believe the "freebore" on a typical SAAMI spec reamer is in the range of .090" freebore.

I believe the "freebore" on a typical FTR style reamer is in the range of .168" and goes up to the .225" range.

They also can't use mags under the rules in FTR so single feeding is required. They load their bullets out long to get as much powder into the case as they can.

Here's an article about it. I think he goes on podcasts where he gives more details

Ian Klemm Sets New F/TR Palma National Record - Vihtavuori

Congratulations to Team Vihtavuori member, Ian Klemm, for establishing a new F/TR Palma National Record and winning the 2020 Midwest LR National Championship. The Midwest LR National Championship was held August 8-9th at the Alliance Rifle Club in Malvern, Ohio. Ian was competing with a 308...

www.vihtavuori.com

What is F/TR palma? I even looked at the rules and I don't see a division for that. I also thought Palma was shot with 155 grain bullets and iron sights, so I can't even figure out what they're talking about (e.g., scopes and 200 grain bullets in a Palma competition).

 

[Downzero]

Another thing that is funny to me is that a 308 with a Sierra 155 TMK at 3000FPS is almost exactly the same as a 6BR with a Berger 105 Hybrid at 2900FPS on both drop and wind all the way out to 1000 yards.

That may be, but I couldn't get 3000 fps out of my 24" barrel (although a dedicated F class rifle might have a 30 or even a 32 inch barrel and maybe could) and most of the people shooting 6mm cartridges in PRS are using a 108 grain Hornady and are achieving higher velocity than 3000 FPS (because they're not running a 6 BR, they're using a Dasher, or a 6mm Creedmoor, or something with more capacity than 6BR). In both sports, there is a pauper's division for those of us shooting .308 for a reason--the ballistic advantage is substantial.

Your comparison isn't apples to apples or even close, which is why the massive ballistic advantage 6mm cartridges have in competition appears to vanish on unrealistic assumptions (100+ fps there on the 155 TMK out of a realistic barrel length, and -100 fps/irrelevant cartridge comparison).

Also, I don't know if you're aware, but Brian Litz's blog has published that the 155 TMK doesn't actually have a higher BC in the real world compared to the Sierra 155 grain 2156. Sierra claims a .504 G1 BC on the latter and .519 on the former, but apparently when analyzed with radar, there's no demonstrable difference. Still, the BCs are impressive and probably among the best that any magazine-length .308 round can use, but perhaps not as good as your calculators make them look. The same may also be true for the heaviest 6mm bullets as well, but I don't have a 6 anymore so I can't say I'm as familiar with them as I am the .308. VLD bullets look really sleek and awesome on paper, but ballistic models aren't perfect and the BC in the real world may be lower than measured under certain lab conditions.

 

[Downzero]

It wasn't really a PRS related comment. Obviously, the 6BR is going to have a huge advantage in PRS for the lower recoil alone.

It was more a general comment that people somehow think that a 308 can't do well at 1000 or further and people never say anything like that about 6BR when they both have very similar elevation and drop with attainable loads out of 26" barrels which are common for PRS.

Personally, I see 10x as many 6BR variants or Dashers as I do 6 Creeds at matches.

I bought the 308 as a trainer for my match 6 creed and it's been a lot of fun playing around with.

My labradar tells me I get over 3000FPS with no pressure signs out of a 26" proof prefit with the TMK's. I am shooting a 6 Creed Proof Prefit right around 3130 with Berger 109 LRHT's. I've been so impressed with the Proof Prefits that I now have 5 or 6 Proof 308 barrels and 4 6 Creed Proof barrels.

My actual 155TMK drop was 3.4mils at 600 yards on multiple occasions.

I shoot at 1000 (or even further, was shooting 1150 a few weeks ago) with a .308. I dunno why people would think a .308 can't perform at 1000. I shoot my 223 out to 800 yards with magazine length cartridges as well. If people are saying that a 308 won't perform at 1k, they're not trying.

 

[Shoots 700's]

.308 goes to 1000 just fine. Wind is just a bit tricky

 

[Darkside-Six]

I’ve been running 42.5 IMR 4064 behind Berger 168 Hybrids right at 2690. Lapua Brass and FED210 primers. Thing is an absolute hammer.

 

[Baddog 0302]

What is F/TR palma? I even looked at the rules and I don't see a division for that. I also thought Palma was shot with 155 grain bullets and iron sights, so I can't even figure out what they're talking about (e.g., scopes and 200 grain bullets in a Palma competition).

F/TR if F class Tactical or something like that, shooters are limited to 223 & 308 chamberings

 

[db2000]

I’ve been running 42.5 IMR 4064 behind Berger 168 Hybrids right at 2690. Lapua Brass and FED210 primers. Thing is an absolute hammer.

I get 2650 185 Juggs Varget 43.5 gr and 2740 175 SMK H4895 42.2 gr w/ 24” 1:10 FGMM 210M and brass

 

[straightshooter1]

I’ve been running 42.5 IMR 4064 behind Berger 168 Hybrids right at 2690. Lapua Brass and FED210 primers. Thing is an absolute hammer.

Ditto . . . except I've been using 168 SMK's with COAL @ 2.856 ( otherwise, same load, same MV out of 26" barrel, same brass and primers).

 

[bluejay75]

Varget is starting to feel overrated. Im feeling that IMR 4064 is performing more consistently across more bullet weights and types. A slight edge in velocity to Varget...but lot to lot 4064 is waaaayyyyy more consistent and predictable.

 

[straightshooter1]

Varget is starting to feel overrated. Im feeling that IMR 4064 is performing more consistently across more bullet weights and types. A slight edge in velocity to Varget...but lot to lot 4064 is waaaayyyyy more consistent and predictable.

The only thing that bugs me about IMR-4064 is being able to meter those little logs with consistency that one can more easily get with a power like Varget.

 

[Snuby642]

Just ordered 500 of the new 169g smk's.
I think they should work well in my sons (mag lenght) 20 inch gun.

Trick will be to get more varget that evidently is the best in his 20 inch that we have had.

 

[Darkside-Six]

Varget is starting to feel overrated. Im feeling that IMR 4064 is performing more consistently across more bullet weights and types. A slight edge in velocity to Varget...but lot to lot 4064 is waaaayyyyy more consistent and predictable.

Same. Varget was hit or miss for me in 308. I see a lot of shooter swear by it but I found a decent load with 175SMK’s but IMR 4064 is way easier. And easier to come by. If you can’t find a load with 4064 then something is wrong with your rifle. Hahaha.

 

[bluejay75]

Same. Varget was hit or miss for me in 308. I see a lot of shooter swear by it but I found a decent load with 175SMK’s but IMR 4064 is way easier. And easier to come by. If you can’t find a load with 4064 then something is wrong with your rifle. Hahaha.

Where’s your 4064 node with that bullet. I’m at 43-43.2.

 

[Darkside-Six]

Where’s your 4064 node with that bullet. I’m at 43-43.2.

Lol. Close. 43.3 running right at 2725.

 

[bluejay75]

Lol. Close. 43.3 running right at 2725.

What COAL? Sometimes we miss some good stuff in just how we pick increments. Im going to try that and see if its more forgiving.

 

[Darkside-Six]

What COAL? Sometimes we miss some good stuff in just how we pick increments. Im going to try that and see if its more forgiving.

I’d have to go back through my data book but I think so where around 0.02 off lands to Ogive.

 

[Gungnir388]

Lol. Close. 43.3 running right at 2725.

I had 2710 with 43.3 and Berger 175gr VLD targets. Get about 2720 with 43.3 behind 175gr scenar-l

 

[Shoots 700's]

I get 2650 185 Juggs Varget 43.5 gr and 2740 175 SMK H4895 42.2 gr w/ 24” 1:10 FGMM 210M and brass

What barrel length and twist?
guess i should have read all of it.

 

[Downzero]

F/TR if F class Tactical or something like that, shooters are limited to 223 & 308 chamberings

I know what F T/R is and I know what Palma is, but I've never heard of a match combining the two and I can find no reference in the NRA rules to it. If people are shooting 200 grain bullets and scopes, that isn't "Palma."

 

[PracticalTactical]

I shoot at 1000 (or even further, was shooting 1150 a few weeks ago) with a .308. I dunno why people would think a .308 can't perform at 1000. I shoot my 223 out to 800 yards with magazine length cartridges as well. If people are saying that a 308 won't perform at 1k, they're not trying.

Ya, no doubt... I wouldnt say guys are not trying, they probably just dont know the tricks to do it well at long range.

I was in a match some years ago where a Farench guy der out of Quebec (Star Shooter) I never shot with before showed up with a long throated 308 running 185 Jugs, while I was running a .3075" bore Krieger with 155 SMKs. At short range I had better accuracy and took a few distances, but I started to fade at 900 and just fell apart at 1000.

I shot paired next to this guy for the finals because he was in first and I was in second overall... I got a first hand look at the accuracy he was getting at 1000 over me. I was fighting to hold the 4 ring (In Canada that's like an 8 in the states) While he was throwing bricks at the 5 ring (10 in the states) and V Bull (V Bull is an X in the states.)

I went home with about a dozen second place awards and the guy out of Quebec running 185 Berger Jugs had a stack of gold.

So ya.. a 308 can certainly be set up to stay supersonic past 1000.

Needless to say, after he took me to school I ordered a new reamer, barrel and changed to a longer throat configuration with heavier bullets.

 

[jLorenzo]

Found the lands in my Howa finally, can anyone give me a frame of reference as far as throats go? It seems long judging by how the jammed round looks. What is a standard .308 throat?
COAL 2.9190
CBTO 2.3275
with 155 SMK

 

[db2000]

Decided to revisit IMR4064 as it gave 3-6 SD in my bolt gun and good groups. Varget have single digit SDs closer to 10. Same 10 rd groups though.
Did some runs in my new Seekins SP10 to see what it liked. Already Varget 43 and 185 Juggs (43.5 was too hot although my bolt gun likes it). Varget was the better choice. Maybe going up on IMR would be better. Didn’t try another weight besides 42.5 gr. Also only had a few loaded so not very strong data.

10/25/21
67F 79% 29.72 in

B 185 Jugg
IMR 4064 42.5
FC brass x 2
BTO 2.145 (max for mag)
2494, 2487, 2510, 2509, 2515
2503, 2520, 2502, 2503 SD 10.1
2.0” minimal pressure

B 185 Jugg
V 43.0
FC brass x2
BTO 2.145
COL 2.2008
2494, 2500, 2504, 2491 SD 5.8
1.25” minimal pressure

 

[Downzero]

Ya, no doubt... I wouldnt say guys are not trying, they probably just dont know the tricks to do it well at long range.

I was in a match some years ago where a Farench guy der out of Quebec (Star Shooter) I never shot with before showed up with a long throated 308 running 185 Jugs, while I was running a .3075" bore Krieger with 155 SMKs. At short range I had better accuracy and took a few distances, but I started to fade at 900 and just fell apart at 1000.

I shot paired next to this guy for the finals because he was in first and I was in second overall... I got a first hand look at the accuracy he was getting at 1000 over me. I was fighting to hold the 4 ring (In Canada that's like an 8 in the states) While he was throwing bricks at the 5 ring (10 in the states) and V Bull (V Bull is an X in the states.)

I went home with about a dozen second place awards and the guy out of Quebec running 185 Berger Jugs had a stack of gold.

So ya.. a 308 can certainly be set up to stay supersonic past 1000.

Needless to say, after he took me to school I ordered a new reamer, barrel and changed to a longer throat configuration with heavier bullets.

Everything I shoot is out of a magazine. It might be a long magazine, but it's out of a magazine. I haven't tried 185s or anything like that because my 12 twist won't stabilize them anyway. Certainly for F class type shooting, you're going to want to get all you can out of the cartridge. But there is nothing unconventional needed to make a .308 shoot at 1000 other than bullets with a G1 BC over .500.

 

[Snuby642]

My precious.

 

[Baddog 0302]

My precious.

View attachment 7729742

Let us know how they group

 

[Snuby642]

They are 0.100 thousands longer than SMK 168 (1.30) ,BTO is 0.53 and bc is 0.527 .

We will see if they run at mag lenght, problem is no load data found.
I have got with Sierra tech dept.

 

[jLorenzo]

I have 100 of the 169s. I read somewhere that Sierra reccomends a seating depth of 2.850, don't quote me on that.
I have Varget, Tac, IMR4895, N140, N150 BLC2 and CFE223. Which powder should I try first with these?

 

[Temper]

I have 100 of the 169s. I read somewhere that Sierra reccomends a seating depth of 2.850, don't quote me on that.
I have Varget, Tac, IMR4895, N140, N150 BLC2 and CFE223. Which powder should I try first with these?

Requesting Varget.

 

[StrayDog]

I'm definitely interested in what speeds guys can get out of the 169's with 24" and 26" barrels.

At some point I'll load some 169s over 44gn of varget in virgin lrp Peterson brass and report back how they do in a seasoned 24" 1-10 5R Bartlein M24.
Maybe this winter...
Also thinking about trying 46-47gn 2000mr...

 

[straightshooter1]

I'm definitely interested in what speeds guys can get out of the 169's with 24" and 26" barrels.

169 SMK's out of a 26" 10:1 Krieger barrel; Lapua brass:

43.2 gr IMR-4064, COAL: 2.929", MV: 2722 fps

43.5 gr H-4895, COAL: 2.929", MV: 2769

40.5 gr AR-Comp, COAL: 2.926 (BTO:2.270), MV: 2686

These all produce 5 shot sub .5" groups @ 100yds. H-4895 did the best in group size, SD's in single digits and ES's in low teens.

 

[straightshooter1]

At some point I'll load some 169s over 44gn of varget in virgin lrp Peterson brass and report back how they do in a seasoned 24" 1-10 5R Bartlein M24.
Maybe this winter...
Also thinking about trying 46-47gn 2000mr...

Using my Varget data in QuickLoad for my 168 SMK's, this is what QuickLoad shows for the 169 SMK's:

45.5 gr Varget(99.5% filled), COAL: 2.926 (BTO:2.270), MV*: 2776 fps out of a 26" barrel; 2733 fps for a 24" barrel.

*estimate (tends to be verily accurate base on the particular lot of Varget I have)

 

[Baddog 0302]

Interesting , COAL 2.9++, the only Mag. that I can load to that length is my Tikka. Because of that I've got two dictated ammo box's . A royal pita to start loading an AR-10 Mag. and have to start all over again with the 2.800 length ammo

 

[StrayDog]

Using my Varget data in QuickLoad for my 168 SMK's, this is what QuickLoad shows for the 169 SMK's:

45.5 gr Varget(99.5% filled), COAL: 2.926 (BTO:2.270), MV*: 2776 fps out of a 26" barrel; 2733 fps for a 24" barrel.

*estimate (tends to be verily accurate base on the particular lot of Varget I have)

Cool, but I also need mag length loads, @2.87 is Max, I'll aim for 2.84-5". The old standard load for 168smk was 44, figured I'll just load 5 and shoot em for a baseline. The only problem is finding time...

 

[Snuby642]

I may have to recive the stupid award on this one. Sierra said they moved the ogive forward from the 168 smk good and they did by 0.030 from the base.

However they failed to make it clear to me that the oal was 0.100 thousands longer. Ouch.

His tactical ruger is just that and has a stingy box basically mag lenght. He needed it for work.

I thought I was doing good.

I think the lands are 2.145

What is the lenght capacity on aics bottom metal if he can find one for ruger?

 

[straightshooter1]

Interesting , COAL 2.9++, the only Mag. that I can load to that length is my Tikka. Because of that I've got two dictated ammo box's . A royal pita to start loading an AR-10 Mag. and have to start all over again with the 2.800 length ammo

Yeah, the mags I use for my RPR allows me to go out to 2.960

 

[straightshooter1]

Cool, but I also need mag length loads, @2.87 is Max, I'll aim for 2.84-5". The old standard load for 168smk was 44, figured I'll just load 5 and shoot em for a baseline. The only problem is finding time...

For these 169 SMK's I started with loads that worked well for the 168 SMK's and there wasn't much adjustment to get the 169's to work. If your COAL is at 2.850 to fit your mags, my QL calculation (based on my lot of Varget) for a 24" barrel shows 44.0 grs of Varget getting an MV of ~2697fps (and my Lapua brass capacity of 55.9 grs of H2O). QL also shows pressure to be somewhere around 56,930 psi; well below the SAAMI max of 62,000 psi.

A different lot of Varget power is likely to produce different results, so one should always start low and work up.

 

[straightshooter1]

I may have to recive the stupid award on this one. Sierra said they moved the ogive forward from the 168 smk good and they did by 0.030 from the base.

However they failed to make it clear to me that the oal was 0.100 thousands longer. Ouch.

I made some measurements when I got my first batch of the 169 SMK's back in February and here's how they compared to the 168's (different lots will be different, but this gives some idea of the differences):

169 SMK's:
Bullet Length: 1.301 (from several different lots I sorted, the range was 1.987 - 3.06)
BTO: .650
Boat Tail: .168
Bearing Surface: .483

Compare that to my 168's . . .
Bullet Length: 1.214
BTO: .617
Boat Tail: .144
Bearing Surface: .453