Test sounds good. I am with @PBWalsh on shooting at 100y. External factors can skew the data at distance. Converting the measurements to MOA/MIL after verifying on paper over multiple groups is what I recommend. Try and shoot them how you normally would from bipod and barricade as to not skew data. If you normally load bipod then do that, however as an instructor I would recommend trying a more neutral position in the futureI've got 40 rounds loaded for the test. 6ARC
Lapua Grendel necked down
108 eldm
29.4 Lever
2.290 oal
should be 2670-2700 This barrel only has about 40 rounds on it. It is the replacement Rainier UM. If head space grows over these 50 rounds they can stick this barrel up their ass.
VLTOR Fusion F-15 Face trued & shimmed. The VTOR Fusion extension is just as loose as the MUR's
Steel KRG Arca rail
22" +2" gas barrel
Gun weight with Ckyepod & no mag is 15lbs-6oz.
I'm thinking 5 rounds to get a good zero @100y Bi-pod/rear bag & light preload, 5 more to true dope to waterline at 500y with same bi-pod rear bag. Then build and break position 5 x with 3 shots each from prone bipod/rear bag to kneeling off a barricade with a smedium heavy fill up against the magwell.
Does this sound like a reasonable test?
What is the preferred program you guys would suggest I use to calculate mean radius after this test??
500Y on paper will probably hurt my feelings. Hopefully the load will be at or under 1 moa at 100y
Thanks
Hornady 4Dof and BallisticX are what I use for measuring groups. I typically go with Ballistic X as it's only function is to measure so it's quicker to knock out and more refined in my experience.