newer rifle savage stealth evolution in 6 creedmoor with short freebore , when I first received this rifle in noticed freebore was to short for factory hornady ammo which didn't present a big problem as I planned to handload , which I did.
I found VERY GOOD LOAD at the top pressure wise 40gr h 4350 lapua brass small primer pocket neck turned to .014 and a .269 neck bushing , rem 7.5 under berger 105 hybrid .
this load shot .26 moa at 3007 fps es 14 sd 7
I also worked up a load using hornady brass and 80gr noslers 43gr h 4350 cci br2 , this load shot .313 moa at 3200 fps which was also up there in pressure.
so I decided to rework these loads to find a lower velocity node for the berger 105's and started at 38.3 with the twice lapua brass with all components being from same lot numbers through out testing the results are as follows 5 shot group avg velocity
38.3gr 3118 fps es 80 sd 32
38.5gr 3134 fps es 82 sd31
38.8gr 3149 fps es 67 sd 27
39.1gr 3160 fps es 45 sd 20
39.4gr 3162 fps es 22 sd 9
39.7gr 3244 fps es 48 sd 19
40.0gr 3195 fps es 38 sd 14
now my real problem..... I have blown 1 primer and pierced 4 or 5
now I understand barrels can get faster after so many rnds ( i'm at 400) but I cant wrap my head around that much velocity increase along with the primer issues and the heavier bolt lift
oh and by the way I reset the factory hornady 108 eld depth to .005 off lands and the produced the best group of the day at an avg of 3033 fps
also tried some hornady brass with the 105's and started at 40gr cause of increased case capacity over the lapua and they procceded to blow 3 primers .
END OF TESTING .
my first thought was my scale was off so I pulled bullets from remaining test loads and found charge weight to be correct
rifle was clean prior to testing with no obstuctions
I am at a loss as to my next step other than reducing loads another 2gr and starting again