22GT load data

[padom]

95 SMK / H4831sc small OCW loaded up. If they shoot anywhere near as good as @Krob95 load I'll be happy.

Loaded 10rd up 38gr....then 3 each 37.4, 37.7, 38.0, 38.3, 38.6 all 0.025" off the lands....no crunch.. powder still has a little room in the case to move.. hopefully I can get out tomorrow to shoot these.

I have a Bartlein 28" 1-7.5 .218 being cut to compare to this 26" 1:7 .219 OBW... I also have a HH .219 28" 1-7.5 coming as well in 6 weeks or so....

 

[Krob95]

what's your CBTO with those 95's?

 

[padom]

what's your CBTO with those 95's?

It's in the picture above. 1.916" I'm right at 1.941" touching lands...

 

[Krob95]

Oh my bad, the pics weren't there when I posted that lol

 

[just browsing]

AI AT-X
28” Brux chambered by 360Precision
6.5 twist .169 fb
85.5gr LRHT (.015-.020 jump)
35.0gr H4350
22GT OCD

Velocity was 3101, spreads in the 5s with 1x fired brass. Virgin brass was about 15fps slower at 3086 with the same spreads. Barrel has about 240 rounds on it so it should be fully broken in.

This was cold bore followed by 5 rounds. That’ll do.

 

[padom]

AI AT-X
28” Brux chambered by 360Precision
6.5 twist .169 fb
85.5gr LRHT (.015-.020 jump)
35.0gr H4350
22GT OCD

Velocity was 3101, spreads in the 5s with 1x fired brass. Virgin brass was about 15fps slower at 3086 with the same spreads. Barrel has about 240 rounds on it so it should be fully broken in.

This was cold bore followed by 5 rounds. That’ll do.

View attachment 7930477
View attachment 7930478

Nice. 85.5 are next up after testing these 95smk

 

[just browsing]

I've had good luck with the Berger 85. I think its a good bullet.

I’ve had good luck with them too. In a number of barrels now including .223, 22BRA, and 22GT.

I did shoot them through the AB Mobile Lab Doppler with the 22BRA and was surprised to see them running a 2% BC variation. Lot to lot conformity and on-target results have been solid in my experience so I would have expected them to be significantly better than that.

The 88gr ELDs tested worse out of the same barrel FWIW… but again, they seemed to shoot fine for me in testing. Would like to try (but haven’t had a chance) 90gr A-Tips and SMKs, though with cost/availability of the Berger’s and how well they’re shooting right now I’m not in a huge rush to change things up again.

 

[padom]

Got out today to shoot 2 OCW's both at 200yd.. Not the accuracy results I was hoping for but Ill try a seating depth test next with the 95 SMK....


95 SMK / H4831sc OCW

No pressure through any of the charges. Really good, consistent single digit SD's and a nice wide consistent POI from 37.4 - 38.00... Consistently right at 0.5moa so nothing horrible.. At least it was consistent other than that 1 group at 38.3..... Ill play with seating depth to see if I can tighten up 37.7...








85.5 LRHT / H4350 OCW

No pressure with any of these charges either. Anything closer to the lands and you werent getting much of the bearing surface in the neck. I generally like to keep bullet diameter worth of bearing surface in the neck (.224).... But when I loaded up .01 off there was probably only half the neck engaging the bullet bearing surface so I seated deeper to 0.03... Either way, didnt like this combo as SD's werent great other than 1 charge weight.... Probably done with H4350, ill play with some other powders.

 

[padom]

I may have missed it, you running standard .120" freebore @padom ?

0.169" which I thought is the standard freebore for 22GT...

 

[padom]

Haha, I hadn't heard that. My buddy has been running the same .120" as the 6mm. So I assumed it was the go to freebore. I run DTACs in my 6GT with .120. And had great luck at that length with my BR. I guess .120" is so 2021

From the smith's I've talked to 0.169 is the original 22GT reamer spec and is pretty much the standard unless they had a reamer made with a shorter freebore.... the people I know running 22GT are all 0.169 freebore and their barrels are chambered by a different smith. So idk

I was running 0.100 and now I'm running 0.130 in my 22BR and it's fucking perfect.

 

[Plam408]

I'm building a 22GT prs match rifle.
Proof 26 inch competition contour.
Cci 450 primer.
88g eldm
H4350 powder.
What powder charge should I start and end at?

 

[4O6shootist]

I'm building a 22GT prs match rifle.
Proof 26 inch competition contour.
Cci 450 primer.
88g eldm
H4350 powder.
What powder charge should I start and end at?

I'd start around 35gr, you'll likely end around 36-36.4 at 3120fps. The 88s shot very well there in my rifle.

 

[padom]

I tested a bunch of freebore lengths in my 22 Dasher, just working my way out with different bullets and lengths. It came down to wanting .120 to .130". So I split the difference and ordered a .125" from Manson.

Once I got to .220" with a 95gr SMK it fell off a cliff. I'll have to set it back and recut it it's so bad. I just didn't see anything that made me believe there was a need to go longer. It shot just like my BR at the shorter length with no need to get the bullet further out of the case. My BR also did well at .160, but then I came to the same conclusion there as well. .120 and .130" is money and I didn't gain anything going a little longer.

My plan is to run 88s for local funnsy stuff and experiment with the 90gr Atip for big matches.

Looking forward to hearing your thoughts with the rounds you're testing. Maybe that extra freebore is the sweet spot in the GT.

Yea I asked around and everyone told me 0.169 was the standard reamer print for 22GT so I went with it. Looking around, all the 22GT prints I see at Alpha, GA Precision, etc. all have 0.169 freebore

 

[dimar1492]

Has anyone hear used one of Alpha Munitions reamers for this cartridge?

 

[Danrobberg]

I have and it works very well. The reamers are expensive but I have a 6 dasher and 22 gt alpha legacy reamer. I run alpha ocd brass in both.

I just got a hawk hill .219 barrel with a 7.2 twist and it shoot incredibly well.

35.1 grains of H4350
85.5 berger hybrids
Cci 400
Seated .020 off lands
3020 fps

 

[dimar1492]

I have and it works very well. The reamers are expensive but I have a 6 dasher and 22 gt alpha legacy reamer. I run alpha ocd brass in both.

I just got a hawk hill .219 barrel with a 7.2 twist and it shoot incredibly well.

35.1 grains of H4350
85.5 berger hybrids
Cci 400
Seated .020 off lands
3020 fps

Thanks for the info.

 

[Krob95]

Has anyone hear used one of Alpha Munitions reamers for this cartridge?

That's what mine is done with.

 

[nrspence]

Alpha reamer for mine as well.

 

[dimar1492]

Thanks, I may pick one up

 

[Krob95]

Went shooting Saturday, when loading my magazine, I noticed this bullet had a fucked up jacket. Could very easily feel it with a fingernail. Figured I'd shoot it anyways to see what happened. Ended up landing about a full inch away from the other 4 shots. Check them Sierra's. Never know what may show up.

 

[padom]

New PVA Bartlein 28" 1-7.5 ready to go....

 

[padom]

Went shooting Saturday, when loading my magazine, I noticed this bullet had a fucked up jacket. Could very easily feel it with a fingernail. Figured I'd shoot it anyways to see what happened. Ended up landing about a full inch away from the other 4 shots. Check them Sierra's. Never know what may show up.


View attachment 7933919

Now I'm gonna have to check my 95's more closely. Haha

 

[John Glidewell]

I have 26" Hawk Hill in a 7.5 twist.

It's interesting that the stability factor is well under 1.5 for the long .224s. Which is kinda the established guideline for full BC via Applied Ballistics. But both my 7 and 7.5" twist barrels gave me the same verified BC at 1000 yards with several bullets. Even the long 95gr SMK gave me a verified .290 G7 BC.

And I think there is value in the slower RPM of the 7.5". I was popping the 95gr like crazy in the mid 3100's with my 22 Creedmoor with a 7 twist.

I just got mine together, running 90 SMK in 7 twist at 3150 and I had a few come apart. Going to back off a little. Next barrel will be a 7.5.

 

[padom]

I have 26" Hawk Hill in a 7.5 twist.

It's interesting that the stability factor is well under 1.5 for the long .224s. Which is kinda the established guideline for full BC via Applied Ballistics. But both my 7 and 7.5" twist barrels gave me the same verified BC at 1000 yards with several bullets. Even the long 95gr SMK gave me a verified .290 G7 BC.

And I think there is value in the slower RPM of the 7.5". I was popping the 95gr like crazy in the mid 3100's with my 22 Creedmoor with a 7 twist.

Just going up from 7 to 7.5 twist my exact same load goes from 313,000 to 290,000rpm.... did the same thing with my 22BR last month and damn that 7.5 22BR is an absolute lazer. Unbelievably accurate at 700yd which is the farthest I shot it so far...

My rule of thumb, I do my best to stay at or under 300,000 rpm

 

[padom]

I just got mine together, running 90 SMK in 7 twist at 3150 and I had a few come apart. Going to back off a little. Next barrel will be a 7.5.

Yea thats 324,000rpm....yikes

 

[John Glidewell]

Yea thats 324,000rpm....yikes

7.5 gets me to 302,00 rpm, but I will play with this and try to find the threshold. Only had 2 of 20 go last outing so I think it is right on the ragged edge. Thinking I may go to 85.5 or the 80.5 bergers and see what happens. I did not plan for the rpm on this one, lesson learned.

 

[4O6shootist]

You guys popping heavies in the 7tw, are these 218 or 219 bore diameters? Ive got a few hundred 88s and 500 ish 90 atips through my 7tw 22gt, never had a bullet failure through the 7tw hawkhill.

 

[padom]

You guys popping heavies in the 7tw, are these 218 or 219 bore diameters? Ive got a few hundred 88s and 500 ish 90 atips through my 7tw 22gt, never had a bullet failure through the 7tw hawkhill.

I never popped a bullet but I'm also conscious of keeping my rpm in check... I'm running 7 and 7.5 twist and bith 218 and 219 in 22BR and 22GT.

 

[Krob95]

It's so weird how that works because running 3160 with the 95's in a 218 and 6.5tw barrel i never had an issue and it was a laser beam.

 

[just browsing]

Same boat as Krob… I’m running 6.5 twist at 3100 with 85.5s and haven’t had any issues popping jackets. .219 bore. 500 rounds on it, 2 matches, load development… every bullet accounted for.

I also have a 6.5 twist 22BRA that shoots 85.5s around 3060… again, no issues.

Obviously 340k+ RPMs (LOL) is pretty extreme, but I think it has more to do with bullet selection than anything else.

 

[Widowmaker300]

Anyone running varget?

 

[padom]

Anyone running varget?

Not Varget but close... I finally got out to test some 4166 today. Screwed my new 28" PVA Bartlein 1-7.5 on my TL3 yesterday. Shot 50rd 37.7gr H4831sc 95smk and they shot ok, nothing special... Best group was 0.5" @ 100yd 2983 SD3 / ES8 @ 0.03 off lands.

Came home and cleaned the barrel last night after those first 50rd. Loaded up a 4166 / 85.5 LRHT pressure test today and shot them. I know I know, my data is shit because I forgot my chrono at home and didnt realize until I got to the range. At least I know where to play..

Loaded virgin Alpha brass from 32.0 - 35.5 in 0.5gr increments. Everything was seated 0.05" off the lands. I was very happy with the results. I shot this fast because I had to get back to take my son to his dentist apt. So I rushed through it and the barrel was smoking hot, no waiting for it to cool between charges.... Knowing all that, it shot really good!!

No pressure until 35gr.. slight ejector mark @ 35gr, little heavier ejector mark at 35.5gr and a slightly sticky bolt but nothing crazy..Its killing me what kind of velocity I was getting. I shoot 4166 in my 22BR and it shoots lights out with 28.7gr @ 3030 out of identical Bartlein blank with 88 ELD...


Going to load up an OCW 33 - 34.5gr in 0.3gr increments with the chrono tomorrow.

 

[John Glidewell]

I just got some 85.5s to try. Talked to a few bullet folks, Sierra said their 90s are thin jackets and to try a lighter bullet, said their 80s are thicker jackets. Berger said their LRHT line is thicker jackets on purpose and I would prob be fine with the 85.5s, so we will see. It will be interesting to see what velocities you got.

 

[padom]

I just got some 85.5s to try. Talked to a few bullet folks, Sierra said their 90s are thin jackets and to try a lighter bullet, said their 80s are thicker jackets. Berger said their LRHT line is thicker jackets on purpose and I would prob be fine with the 85.5s, so we will see. It will be interesting to see what velocities you got.

I mean...if Im shooting them in my 22BR with only 28.7gr and getting 3030..... Whats 32-35gr giving me in the 22GT?? Same identical blank....length, twist, etc.. only difference is 22GT instead of 22BR chamber.. I would say gotta be over 3100....

 

[John Glidewell]

That's my thought. QL has mine at 37.7 of N555 at 3185 and max of 39.6. I will run a ladder from mid 36 to mid 38 and see what happens.

I plugged 4166 into my 22GT profile with 28" barrel and it has 34 grains on barrel time at 3166fps. Of course that is not a trued profile for your gun but probably in ball park. Has 35 as max.

 

[padom]

That's my thought. QL has mine at 37.7 of N555 at 3185 and max of 39.6. I will run a ladder from mid 36 to mid 38 and see what happens.

I plugged 4166 into my 22GT profile with 28" barrel and it has 34 grains on barrel time at 3166fps. Of course that is not a trued profile for your gun but probably in ball park. Has 35 as max.

I would say that is spot on....I called 35gr start of pressure...everything before that looks good

 

[4O6shootist]

I mean...if Im shooting them in my 22BR with only 28.7gr and getting 3030..... Whats 32-35gr giving me in the 22GT?? Same identical blank....length, twist, etc.. only difference is 22GT instead of 22BR chamber.. I would say gotta be over 3100....

The gt is quite a bit larger vessel than the BR, believe 38.X vs 44.X, however bet it is running fast. My 6gt liked 4166, psi was around 2940 with 108/109s. Hadn't tried it in the 22.

 

[padom]

The gt is quite a bit larger vessel than the BR, believe 38.X vs 44.X, however bet it is running fast. My 6gt liked 4166, psi was around 2940 with 108/109s. Hadn't tried it in the 22.

I've shot and have data with 4166 in 223rem, 220TB, 22BR, x47L, 6.5cm and 308win....its given me great speeds and accuracy in all of those cartridges.

We will see what the numbers are tomorrow

 

[4O6shootist]

I've shot and have data with 4166 in 223rem, 220TB, 22BR, x47L, 6.5cm and 308win....its given me great speeds and accuracy in all of those cartridges.

We will see what the numbers are tomorrow

I tested it against varget in the 6gt. Equally great accuracy, buy 4166 pressured out about 60fps sooner. My rig was a 28" barrel and 4166 at 2940 was just under pressure, but it shot well there. That was Horandy brass however, have since switched to alpha.

 

[padom]

Alright, I loaded up a smaller OCW today 32.2gr - 34.6gr. I stopped at 34.6gr because I started to see signs of pressure above that yesterday when I forgot my chrono.. Well no shit I saw pressure above 34.6gr after todays outing over the Labradar!! hahahha.. I was easily 3350-3400 yesterday at 35.5gr!!

These speeds are exactly what I thought they would be based off my experience with 4166. One thing I did different today, I loaded everything to .040" off instead of 0.050" off like yesterday. I was just shooting pressure test today over the Labradar. Wasnt shooting for accuracy. No breaks, not cooling, just shot them all in a row, 86F and 75% humidity...barrel was smoking how for this test.

34.3gr 4 shots in 1 hole then I yanked that 5th one. Ill go back to 0.050" off and test around 33gr.

 

[John Glidewell]

And no blow ups? Nice!

 

[padom]

And no blow ups? Nice!

Zero. Every single bullet accounted for... going up from 7 to 7.5 twist has been great. 3300 is only 316,000... my 7 twist that would be 340,000rpm

Now I was only looking for pressure today and it starts in a little at 34.6....1 out of 5 cases had an ever so slight bolt that was a hair heavy...

I dont plan to shoot anywhere near those speeds but just reporting the data...3150-3200 is where I want to be

 

[just browsing]

35.0gr of 4350 has settled at an average speed of 3165, and the spread was under 5 today across 20 rounds.

I also shot 34.9, 35.0, and 35.1 charge weights in the same series to see how the node was doing and while the spread did jump slightly, it was still comfortably in single digits across 15 rounds (5x each).

Calling it good.

 

[padom]

Good thing I wasn't doing any accuracy testing and my last 2 posts were just pressure tests with 4166 in my new 28" PVA Bartlein..

Because I cleaned my barrel today and discovered that when I took my scope off to pull the PVA OBW earlier this week and install the new Bartlein I put my scope back on.. turned the MDT one piece mount nuts with my fingers and never tightened them or torque them... hahahahah...

So those 150rd or so I've put through it were all with a loose scope... I was cleaning the rifle and I touched one of the MDT one piece mount nuts and it was just spinning and loose. Checked the other 3 nuts....spinning loose...said damn I never tightened them up....I dont know how the damn scope didn't fall off. Shout out to MDT! .

Barrels cleaned, scope is properly torqued on, 1x brass is sized and ready to load.

 

[Plam408]

I just started to break in my 22gt Proof barrel.
Soft recoil and accurately is there.

How are you guys resizing your brass?
I have Alpha 22gt brass with Rcbs 6gt fl dies and .249 redding bushing.
Should I change out the expander ball to 223?

 

[padom]

I just started to break in my 22gt Proof barrel.
Soft recoil and accurately is there.

How are you guys resizing your brass?
I have Alpha 22gt brass with Rcbs 6gt fl dies and .249 redding bushing.
Should I change out the expander ball to 223?

Yes...unless you want to ruin your brass.... I remove the expander and use a 21st Century TiN Turning mandrel after my FL Bushing die..

 

[just browsing]

I just started to break in my 22gt Proof barrel.
Soft recoil and accurately is there.

How are you guys resizing your brass?
I have Alpha 22gt brass with Rcbs 6gt fl dies and .249 redding bushing.
Should I change out the expander ball to 223?

Just remove the expander and use a mandrel to set neck tension after sizing/cleaning/etc.

21st Century, Sinclair and a few others make dedicated mandrel dies.

.247-.248 bushing with a .2220-.2225 mandrel should do the trick.

 

[4O6shootist]

I just started to break in my 22gt Proof barrel.
Soft recoil and accurately is there.

How are you guys resizing your brass?
I have Alpha 22gt brass with Rcbs 6gt fl dies and .249 redding bushing.
Should I change out the expander ball to 223?

Find the bushing that gives desired neck tension. Mandrels arent necessary, plus its another step that work hardens necks prior to seating. Believe I'm using a 250 bushing and getting loaded diameter of 252nk. Original reamer was 255nk, but since have reamed to 257 for adequate clearance.

 

[Krob95]

I'll echo the above, pull that expander ball, and get an expander mandrel. .2220 or .2225 and expand after sizing. I didn't notice any issues over the course of 3 firings in my brass with out annealing. SD's were single digit still.

 

[padom]

Find the bushing that gives desired neck tension. Mandrels arent necessary, plus its another step that work hardens necks prior to seating. Believe I'm using a 250 bushing and getting loaded diameter of 252nk. Original reamer was 255nk, but since have reamed to 257 for adequate clearance.

Ill disagree on this. Using a proper bushing size sizing down .004 under loaded neck diameter and opening up a neck .002 to give you a final .002 neck tension does not work harden necks... This process works the necks the least compared to other methods with the best concentricity..

Just using a bushing and no expander ball or mandrel pushes all imperfections to the ID of the neck with no expander to straighten it out....

If it works for you great, but there is a thread around here somewhere I tested all the methods, FL sizing, Bushing only, Bushing and Expander ball, bushing and mandrel, etc. and just using a bushing with no expander or mandrel gave the least consistent and most runout of all the methods tested...