Selecting test group size and variation for projectile gr load development?

I’m open to some suggestions and pointers.

There you have it; we have gone from ‘looking for suggestions and pointers’ to shooting at 900 yards in 20 responses.

Again, I built a 270 Winchester, I loaded 6 boxes of ammo with two different loads in each box; that meant I was using different head stamps, different bullets and different powders. The cases with different head stamps were new case, once fired cases from different manufacturers in groups of 10. I went to the range and fired all 120 rounds in one day. I did not adjust the scope, I did not have one flyer and each group could be covered with a quarter, some of the groups shared the same hole.

I loaded another 6 boxes of ammo and delivered the rifle to the new owner. I wanted him to determine ‘what the rifle liked’. His answer was ‘everything’. He said he would fire the first round of the next 10 and then adjust the scope to zero. His groups were smaller that my groups and he though he could improve on that but he did not like the trigger. Easy solution, improvements in accuracy can be had for $150.00 +/- a few.

Point: I could load 100 rounds of any one of the 12 different loads I gave him; all he had to do was sight the rifle in.

F. Guffey
 
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