Loaded up 50 107's in new Alpha Dasher brass last night, hope to push them through my brand spanking new barrel to do some speed up this weekend before load dev. Loaded them with a very mild 29.5 gr Varget, thinking after that I'll do a bunch of 5 round groups at 0.5gr increments. Will need to wring some speed out of this one, Ladasha only has an 18" barrel and is waiting on either a 2-12 NX6 or 3-18 Rokscope to trim her top end up a bit lol.
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thats a light load lol
heres what blue mountain precision told me about load dev:
find hard jam, start at like 31gr of varget, set it .010 off, 40 off, 80 off and 120 off and I make big jump windows and I just knocked the charge down by a tenth for each seat depth, that keeps velocity at the same speed. 26" barrel you are in the 2860-2900 with a 108 typically. you can get 3k but it doesnt hold groups there, pressure is too high.
just to make a quick load to go out, break the barrel in for 100 rounds and then finish the load completely because I'm a big believer in just sending some rounds through the barrel before you waste your time doing load development. Let it season in and then so I'll go ahead and I'll do .010 with three shots, a 40 with three shots, an 80 off with three shots and a 120 with three shots.
then I just shoot groups. I was a dasher. I do that 200 yards. I don't do it at 100 with other guns. I'll do 100 yard jump test. after narrowing down a smaller jump range, he does .003 jump tests at 400yds.
i believe that velocity range works with 6mm in general. i have a match 243w criterion barrel that i was trying to run 3k with 108 bergers and it was only getting .75-1" @ 100yds. tried all sorts of powder and bullets, same issue, inconsistent from day to day too. after scouring the 'net on theory and such, i loaded a powder charge for 108's to hit the 2870 range, loaded bullets from 80gr to 112gr all .010 off jam. they all shot in pretty similar fps range and all shot the best the barrel ever done consistently. pretty eye opening to see for myself after fighting it so much.
