I have a tool i use to check my shoulder ogive or shoulder bump.
After sizing cases I can measure that and I want them all the same.
All neck ID the same and OD the same.
You know that stuff though.
For cold bore shooting that is not bad.
Once fired .308 brass with a crimp I will go out on a limb and say LC brass.
I have shot groups with many different brands of brass and Norma, Lapua or Winchester
are my favorites in .308
Take those same cases and load the same and go shoot again and see if you get the same results.
When I first began loading for .308 and 30-06 I tried neck sizing VS full length sizing and FLS won every time.
I did modify my dies so that the cases were only sized down at most .002" anywhere. Except the neck of course.
Another multiple rounds fired on multiple days test was setting my shoulders back .008" on winchester cases.
This was not a test at first but I found my case life was not great and I made a tool to measure shoulder bump and found I was setting them back .008" each time.
Accuracy was excellent in fact better than bumping them .000" or .002" back.
Case life was very short though.
I tend to over think things and I was thinking maybe there was some shock absorber effect happening when the shoulder had to "bump out" to fill the chamber or some extra time for powder to burn that resulted in increased accuracy.
Little more accuracy was not enough to have less case life though.
I suppose if I shot competition I would sacrifice case life.
But I do not and my accuracy needs to just be good enough to result in a clean 1 shot kill to put meat on the table.
Your groups are good enough to stretch their legs and you may be surprised at the results at 200 yards. You may shoot the same group sizes.
After sizing cases I can measure that and I want them all the same.
All neck ID the same and OD the same.
You know that stuff though.
For cold bore shooting that is not bad.
Once fired .308 brass with a crimp I will go out on a limb and say LC brass.
I have shot groups with many different brands of brass and Norma, Lapua or Winchester
are my favorites in .308
Take those same cases and load the same and go shoot again and see if you get the same results.
When I first began loading for .308 and 30-06 I tried neck sizing VS full length sizing and FLS won every time.
I did modify my dies so that the cases were only sized down at most .002" anywhere. Except the neck of course.
Another multiple rounds fired on multiple days test was setting my shoulders back .008" on winchester cases.
This was not a test at first but I found my case life was not great and I made a tool to measure shoulder bump and found I was setting them back .008" each time.
Accuracy was excellent in fact better than bumping them .000" or .002" back.
Case life was very short though.
I tend to over think things and I was thinking maybe there was some shock absorber effect happening when the shoulder had to "bump out" to fill the chamber or some extra time for powder to burn that resulted in increased accuracy.
Little more accuracy was not enough to have less case life though.
I suppose if I shot competition I would sacrifice case life.
But I do not and my accuracy needs to just be good enough to result in a clean 1 shot kill to put meat on the table.
Your groups are good enough to stretch their legs and you may be surprised at the results at 200 yards. You may shoot the same group sizes.
