300prc 230 Berger load development

B

Bluepsylo

Private
Minuteman
Sep 4, 2019
29
2
#1
For you seasoned and experienced people. I've been loading for this 300PRC. it's build on a Savage stainless action, 31" IBI 1:8 5R barrel with 3.850 AICS mag. Choate ultimate stock.

Currently fire forming new Lapua brass with 79.8grs of VV N570. Avg velocities @ 3015fps. Barrel has around 300 down the pipe so it should be broken in. It seems that I can put 2 shots tight but then always seem to pull the 3rd. Am I beating myself? Yesterday I wanted to confirm my zero @ 400yds and shot these groups. Thing it's a seating depth thing or is it me.
 

Attachments

  • Screenshot_20210901-193721_Range Buddy.jpg
    Screenshot_20210901-193721_Range Buddy.jpg
    172.3 KB · Views: 266
  • shot_1630550132725.jpg
    shot_1630550132725.jpg
    246.1 KB · Views: 260
#5
Not sure if this is a serious post but in case it is, those are solid groups. My guess is that you’ve reached the limit of that system’s precision potential with those components (and possibly any combination of components).

What’s the purpose/application for this rifle?

Are you using it in F-Class or similar? hunting (its more then adequate as is for hunting)? “plinking” (a stupid ass term but one that’s used all too frequently so thought id throw it in).
 
#7
nn8734 said:
Not sure if this is a serious post but in case it is, those are solid groups. My guess is that you’ve reached the limit of that system’s precision potential with those components (and possibly any combination of components).

What’s the purpose/application for this rifle?

Are you using it in F-Class or similar? hunting (its more then adequate as is for hunting)? “plinking” (a stupid ass term but one that’s used all too frequently so thought id throw it in).
Click to expand...
It is a serious post. I respect your reply. I'm happy with the results but am always looking for ways to improve on my reloading and shooting. I'm just a regular guy who likes to shoot. I don't have time to compete at the moment (three little boys). I built this rifle to shoot a mile. That's a personal goal (consistently hit a mile 1 moa or less).
 
#9
Bluepsylo said:
It is a serious post. I respect your reply. I'm happy with the results but am always looking for ways to improve on my reloading and shooting. I'm just a regular guy who likes to shoot. I don't have time to compete at the moment (three little boys). I built this rifle to shoot a mile. That's a personal goal (consistently hit a mile 1 moa or less).
Click to expand...
Well in that case, my suspicion is the problem isnt related you as a shooter or your load but something in the system itself.

ive seen that pattern of tight group w/flyer before in my R700 when i swapped my bedded McMillan A2 stock with a Cadex Dual Strike about 7 years ago. with the A2 id rarely have flyers however the dual strike (unbedded) threw one every forth shot or so.

To confirm/deny, I shot five 5-round groups using the rifle with the A2 and then five groups with the DS at 100 and 200 meters. With the A2 on, had two flyers total that were my fault while the dual strike had a flyer in every group but one.

I sold the DS and kept the A2.
 
Last edited:
  • Like
Reactions: bogey and babyguppy
#10
nn8734 said:
Well in that case, my suspicion is the problem isnt related you as a shooter or your your load but something in the system itself.

ive seen that pattern of tight group w/flyer before in my R700 when i swapped my bedded McMillan A2 stock with a Cadex Dual Strike about 7 years ago. with the A2 id rarely have flyers however the dual strike (unbedded) threw one every forth shot or so.

To confirm/deny, I shot five 5-round groups using the rifle with the A2 and then five groups with the DS at 100 and 200 meters. With the A2 on, had two flyers total that were my fault while the dual strike had a flyer in every group but one.

I sold the DS and kept the A2.
Click to expand...
Thanks, that's the kind of input I've been looking for. This barrel being 1.25" is heavy. I clearanced the stock to clear the barrel and I bedded really first 2" of the barrel back to the lug but I think the barrel maybe touching the stock due to flex on recoil? I'm gonna open it up a bit more and try.
 
#11
Stop evaluating performance with 3 shots. You're making the assumption that the system is repeatable to a degree that variations can be identified and diagnosed with sample size = 3. It's not realistic.

In my experience/testing, short-hand evaluation that I am lukewarm confident in starts at 10 shot groups. True evaluation is 20-35 shots. I'm not saying you NEED to do 20-35 shot groups. I'm saying if you want to have statistical confidence in the performance of your loads you have to shoot a minimum of 18-20 shots. This is based off of tracking thousands of rounds worth of 20-50 shot groups and seeing when the data converges to a realistically useful level. YMMV.

Honest opinion: Keep what you have the same and just shoot it. Don't worry about "patterns" you see in 3 or 5 shot groups, and only diagnose problems when you can't hit your intended targets.
 
  • Like
Reactions: spife7980
#12
Ledzep said:
Stop evaluating performance with 3 shots. You're making the assumption that the system is repeatable to a degree that variations can be identified and diagnosed with sample size = 3. It's not realistic.

In my experience/testing, short-hand evaluation that I am lukewarm confident in starts at 10 shot groups. True evaluation is 20-35 shots. I'm not saying you NEED to do 20-35 shot groups. I'm saying if you want to have statistical confidence in the performance of your loads you have to shoot a minimum of 18-20 shots. This is based off of tracking thousands of rounds worth of 20-50 shot groups and seeing when the data converges to a realistically useful level. YMMV.

Honest opinion: Keep what you have the same and just shoot it. Don't worry about "patterns" you see in 3 or 5 shot groups, and only diagnose problems when you can't hit your intended targets.
Click to expand...
I appreciate the input.
 
You must log in or register to reply here.

Similar threads

pangris
Battle Arms Development barrels and customer service – Caveat Emptor
Replies
15
Views
818
JS8588
J
S
300PRC +P Load development
Replies
107
Views
6K
BCX
BCX
S
Load Development for a 300PRC +P
Replies
3
Views
668
Sweet Tooth
S
6MT
300gr SMK & VV N570
Replies
2
Views
348
disky1
D
M
ZA/Bighorn Origin - Proof Prefit - 300WM or 300PRC with 215+ Bergers
Replies
10
Views
1K
Michael Theunissen
Michael Theunissen
Top Bottom
Back
Home
Forums
Merch
Alerts