300 PRC update

[MOUNTIC]

Oh dear lord...I didn't even think about changing my bushing size...welp...I guess we'll see if I have the proper size soon.

If neck thickness is the same as the win mag ADG brass you should be good in the 335-336 range.

 

[b6graham]

sherman(ADG) brass is .335 bushing per rich

 

[Defiance Machine]

Maybe I read that wrong but are you saying prefits work with a Deviant action?

We're saying the same work required to chamber/thread a barrel would be necessary whether it be a 700 or one of our actions, and since prefits are available, in the case of the Ruckus it would actually be easier and cheaper.

 

[b2lee]

If you need it...and you hurry... Powder Valley is showing 6 1lb bottles of Retumbo in stock.

 

[Mk32784]

If you need it...and you hurry... Powder Valley is showing 6 1lb bottles of Retumbo in stock.

How does Retumbo compare to RL26 for velocities on the 225/230? I got Retumbo left over... but I can't seem to find RL26.

 

[b2lee]

How does Retumbo compare to RL26 for velocities on the 225/230? I got Retumbo left over... but I can't seem to find RL26.

Don't know...this weekend I should have some load data on RL-26...so I can probably give it to you after Sunday. So far....for me it is N565, Retumbo, Maybe RL -26 when I get data........ big gap... H1000.....HUGE GAP.... RL-33.

I've yet to find anything as good as N565 for me...in my gun....in my conditions....for my developed loads.

 

[abn31c]

Well, damn. I got 4 lbs. H1000 left. Anyone try Rl23 in the 300 prc yet?

 

[dfp dfp]

Range report

My 24" MPA tube seems fast to me...

This trip out with Rl 26... match 225s

70°..70%H..750 feet..B29.86

74.5..2870
74.7..2877
74.9..2882
75.1..2902

Stopped there....last test with H1k....the faster the sloppier... started seeing same results and running out of time...(It has a strip and start each string at not greater than 86°)....

My barrel seams to like high 27s to low/mid 28s...Have to rework a few and hone in on the jelly...

Just sharing

 

[Prw]

Range report

My 24" MPA tube seems fast to me...

This trip out with Rl 26... match 225s

70°..70%H..750 feet..B29.86

74.5..2870
74.7..2877
74.9..2882
75.1..2902

Stopped there....last test with H1k....the faster the sloppier... started seeing same results and running out of time...(It has a strip and start each string at not greater than 86°)....

My barrel seams to like high 27s to low/mid 28s...Have to rework a few and hone in on the jelly...

Just sharing

Thanks for the info

 

[Mk32784]

Don't know...this weekend I should have some load data on RL-26...so I can probably give it to you after Sunday. So far....for me it is N565, Retumbo, Maybe RL -26 when I get data........ big gap... H1000.....HUGE GAP.... RL-33.

I've yet to find anything as good as N565 for me...in my gun....in my conditions....for my developed loads.

Gotcha, thanks look forward to hearing your report!

Thread has been super helpful getting ahead of this.

 

[Merovingian]

FYI: Unknown has ADG back in stock.

 

[b2lee]

SHH!!!!! Don't tell anyone...I may need 200 more.

 

[Merovingian]

SHH!!!!! Don't tell anyone...I may need 200 more.

I'll delete mine, if you delete yours.

 

[b2lee]

It will be gone before I'm home from work. Plus I'm out of cash until payday. They had 203 bottles of Varget 2 days ago at Powder Valley...and it's all gone now. The Hornday brass is currently at 9x fired and still holding up decent with moderate loads. If I keep the 230's under 3000fps I'm good

 

[Merovingian]

You're golden. The way I look at it is the faster they sell out the first lot, the more likely they'll keep them on the schedule for an Apr. run. I got 2 this time round, should be here tomorrow...that'll be plenty till spring.

 

[b2lee]

I'm sure atleast half of you got the Mile High email about Berger bullets. I'd be interested in load data on the EOL 245gr Bergers.

 

[FauXPaS]

If neck thickness is the same as the win mag ADG brass you should be good in the 335-336 range.

I got my ADG brass today. Wall thickness at the neck was 0.016. Total diameter (0.308+0.016+0.016) of 0.340. So, I ordered 336, 337, and 338 bushings. Hopefully one of those is the ticket.

 

[b2lee]

I thought Hornady brass was the worst brass in the history of man according to the forums?

Yep...can't wait to get the 'good stuff'....it is bad when you want to really push the pressure. To be honest...maybe everyone should have some Hornady brass...because it shows pressure early...and may save some damage to your rifle or......your face....when doing load development.....then run the good stuff when you need 50 firings from your brass and better consistency.

It's not bad brass....the softness is a feature!

 

[b2lee]

I'd be interested to see what you get with some N565. I never keep loads long enough for it to matter...but interested to see my loads when it gets 90F+ outside in the summer....actually..I just can't wait until i'm not constantly cold every day

 

[abn31c]

I cant find shit for powder, gonna get some rl23 this weekend to try with 215 hybrids.

 

[dfp dfp]

Dont both

I cant find shit for powder, gonna get some rl23 this weekend to try with 215 hybrids.

Bass pro has one lb. H1k for 32 bucks if ur in to that sort of thing...

 

[MOUNTIC]

For the Lone Peak Fusion TI hunting rifle... few more days til I can go pick it up.

 

[Ledzep]

77.5gr of Retumbo will push a 250 A-tip at 2950fps in a 37" barrel.

 

[Mk32784]

I just tired to order more from unkown they say it's gone.

Going to go with Retumbo for now. Can't find any Rl26

 

[triumph001]

77.5gr of Retumbo will push a 250 A-tip at 2950fps in a 37" barrel.

View attachment 7265428

I remember my first Marlin goose gun.

 

[Rocketmandb]

How does Retumbo compare to RL26 for velocities on the 225/230? I got Retumbo left over... but I can't seem to find RL26.

I played with Retumbo before I went on my great RL26 quest. It is nowhere near as fast. H1k worked better for me pre-RL26.

 

[LongRangeAggie]

From Berger tech, pulled from the 300 PRC Facebook group, load up boys. I'm hoping to have some 245s loaded this weekend, will report, can't wait to see what they do with N565 behind them.

 

[Steel head]

77.5gr of Retumbo will push a 250 A-tip at 2950fps in a 37" barrel.

View attachment 7265428

 

[JohnK454]

I got my ADG brass today. Wall thickness at the neck was 0.016. Total diameter (0.308+0.016+0.016) of 0.340. So, I ordered 336, 337, and 338 bushings. Hopefully one of those is the ticket.

Just measured my new ADG brass with a tube mic - my neck thickness is running .0151" - .0153"

Edited to add:

(100)
Avg weight 262.0grs
Min 260.9grs
Max 262.8grs
Std dev .52

 

[LongRangeAggie]

Should I use the Federal 210M or 215M? Someone enlighten me

 

[b2lee]

I use the 210M because I have a literal shit ton of them....and have seen absolutely no problems with them. Others' swear by the 215M's.

 

[abn31c]

Just measured my new ADG brass with a tube mic - my neck thickness is running .0151" - .0153"

Edited to add:

(100)
Avg weight 262.0grs
Min 260.9grs
Max 262.8grs
Std dev .52

That makes 2 grains heavier than my batch of Hornady, and about the same std dev.

 

[LoanHarvey]

77.5gr of Retumbo will push a 250 A-tip at 2950fps in a 37" barrel.

View attachment 7265428

That is one cool mo fo!!!!!

 

[abn31c]

I’m running CCI200 they cut my SD down in muni win mag over the 215M.

Yes, the 200's are the shit for me as well.

 

[Ledzep]

That’s amazing! What action and what barrel twist/ manufacturer?

ARC Nucleus long action, Bartlein 1:8.5" twist. It was supposed to finish at 36" but I haven't had a problem by not cutting the last inch off... yet... so I left it at 37". MTU Contour.

 

[b2lee]

I think the Retumbo is completely burned by about 20 inches....you may have better speeds with RL-33. RL-33 sucks donkey butt for me...however...it may be great for you with that long barrel that needs a more prolonged powder burn. If you lived closer..I'd give you some to try out.

 

[LongRangeAggie]

@Ledzep how much does that bad boy weigh?

 

[4KDOA]

Mid South is showing RL 26 1lb and 8lb in stock.

 

[Ledzep]

@Ledzep how much does that bad boy weigh?

18.7lb with my AMG in an ARC Unimount. The mk6 was a temp.

 

[NVScout]

I’ve had some N565 waiting on the ADG that just showed up !! Does anyone have any data for 565 and the 230 A-tips ? And has anyone sacrificed a case to Aztec that they would like to share ??

 

[b2lee]

I'm using 78.5gr of N565 with the 230gr A-TIPS... WARNING!!!!! That is HOT and using Hornady brass. I intend to start at around 75gr and work up since the ADG brass most likely has less case capacity and will shoot hotter with less powder.

 

[Rocketmandb]

I got my 250 ADG cases today. I prepped 50 of them and will load them tomorrow for a Sunday trip to the range. I haven't weighed them yet, but I did measure a few of the necks. All seemed to be 13.5 - 14 thousandths.

ALSO...

I got my LE Wilson seater die a little bit back, so will be using that for the first time with the ADG.

Fun times.

 

[b2lee]

Unknown Munitions is showing 47 boxes of 300PRC brass in stock at the moment.

https://www.unknownmunitions.com/product/adg-brass/

 

[TripleBull]

Mid South is showing RL 26 1lb and 8lb in stock.

Thanks, I scored.

Ididn't want to push it into the current budget situation but couldn't afford not to buy while available.

 

[Dschapp44]

Looks like preorder for the April run to me unfortunately

 

[NVScout]

I'm using 78.5gr of N565 with the 230gr A-TIPS... WARNING!!!!! That is HOT and using Hornady brass. I intend to start at around 75gr and work up since the ADG brass most likely has less case capacity and will shoot hotter with less powder.

If anyone has a H20 capacity for the ADG I’ll try and run quick load on it.

 

[NVScout]

Cartridge : .300 Precision Rifle Cartridge
Bullet : .308, 230, Hornady A-TIP 3091 G7
Useable Case Capaci: 85.686 grain H2O = 5.563 cm³
Cartridge O.A.L. L6: 3.830 inch = 97.28 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N565 *C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 74 60.00 2152 2365 26961 9758 90.8 1.952
-18.0 76 61.50 2206 2486 28688 10081 92.0 1.905
-16.0 78 63.00 2261 2610 30516 10394 93.1 1.858
-14.0 80 64.50 2315 2738 32457 10698 94.2 1.813
-12.0 81 66.00 2370 2868 34517 10990 95.2 1.769
-10.0 83 67.50 2424 3002 36703 11270 96.1 1.726
-08.0 85 69.00 2479 3138 39021 11537 96.9 1.676
-06.0 87 70.50 2533 3278 41482 11788 97.6 1.626
-04.0 89 72.00 2588 3420 44092 12025 98.2 1.579
-02.0 91 73.50 2642 3564 46863 12244 98.8 1.533
+00.0 92 75.00 2696 3711 49804 12445 99.2 1.489
+02.0 94 76.50 2749 3861 52927 12628 99.5 1.446
+04.0 96 78.00 2803 4012 56246 12791 99.8 1.405 ! Near Maximum !
+06.0 98 79.50 2856 4166 59774 12934 99.9 1.365 ! Near Maximum !
+08.0 100 81.00 2909 4321 63527 13055 100.0 1.327 ! Near Maximum !
+10.0 102 82.50 2961 4478 67523 13161 100.0 1.290 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 92 75.00 2827 4081 60410 12038 100.0 1.367 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 75.00 2512 3224 39541 12165 93.6 1.650

 

[aaronk]

I’ve had some N565 waiting on the ADG that just showed up !! Does anyone have any data for 565 and the 230 A-tips ? And has anyone sacrificed a case to Aztec that they would like to share ??

Here's my data so far, no signs of pressure at 78.0g so running up to 79.0g next. Gun is a Seekins Havk with 26" barrel. I'm hoping to get upper 2800's, as I'm not trying to push it too hard. The factory Hornady 225g ELD Match is shooting at 2,883fps out of my gun, which seemed fast, but I'll take it!

This is with Hornady brass, not ADG.

 

[Rocketmandb]

I got my 250 ADG cases today. I prepped 50 of them and will load them tomorrow for a Sunday trip to the range. I haven't weighed them yet, but I did measure a few of the necks. All seemed to be 13.5 - 14 thousandths.

ALSO...

I got my LE Wilson seater die a little bit back, so will be using that for the first time with the ADG.

Fun times.

More info:

- External neck diameter of a loaded round is .3365 - .337.
- I also used a mandrel to open up the necks, then...
- I used a .335 bushing to size them back
- If I have time, I'll get external neck size of all loaded rounds (first 50)
- External neck diameter of a new case is .333

 

[Rocketmandb]

Weighed 25 ADG cases post-prep (slight material loss from chamfer/deburr, but not really relevant):

Weight in grains

257.64
257.14
256.6
258.4
257.8
258
257.92
258.8
257.54
257.9
257.86
258.2
257.68
257.52
258.38
257.7
258.58
257.56
257.08
257.7
256.44
258.04
257.86
258.18
258.02

Average: 257.7816 gr
SD: .5398 gr