Re: New US Military .300 Win Mag Match MK 248 MOD
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ChadTRG42</div><div class="ubbcode-body">An exact copy of it. The charge weight is all I would need, and I should be able to figure that part out based on the velocity. I have some 220 SMK, so I may play with them and some H1000. </div></div>
I've been playing with this load lately.
I went up to 75.7gr of H1000 but, I was about .030 off the lands *(JBM said I was making 2860fps and I was at 27.0 moa at 1000 from a 100yd zero ).... moved down to 75.0gr at .010 off the lands and, it's showing pressure signs. I'm going to start off at 73.5 and move to 74.5 and see how that does at .010 off the lands.
75.0gr at .010 off the lands in a 26" 1:10 twist was giving almost 2900fps... It was dangerously hot. Brass looked ok but, the primers were having that nice moon crater and they were flat as hell.
This charge was only 26.25 elevation from a 100yd zero at 1000yds.
I shot them like that instead of pulling them... I'll probably have to throw away the brass now since the primer pockets are most likely too loose! LOL
If I had to guess ( and I do right now ), I'd say the 2850fps charge is somewhere around 74.0gr with the 220smk.
OAL ended up being about 3.52, win brass, rem 9 1/2M primers.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ChadTRG42</div><div class="ubbcode-body">An exact copy of it. The charge weight is all I would need, and I should be able to figure that part out based on the velocity. I have some 220 SMK, so I may play with them and some H1000. </div></div>
I've been playing with this load lately.
I went up to 75.7gr of H1000 but, I was about .030 off the lands *(JBM said I was making 2860fps and I was at 27.0 moa at 1000 from a 100yd zero ).... moved down to 75.0gr at .010 off the lands and, it's showing pressure signs. I'm going to start off at 73.5 and move to 74.5 and see how that does at .010 off the lands.
75.0gr at .010 off the lands in a 26" 1:10 twist was giving almost 2900fps... It was dangerously hot. Brass looked ok but, the primers were having that nice moon crater and they were flat as hell.
This charge was only 26.25 elevation from a 100yd zero at 1000yds.
I shot them like that instead of pulling them... I'll probably have to throw away the brass now since the primer pockets are most likely too loose! LOL
If I had to guess ( and I do right now ), I'd say the 2850fps charge is somewhere around 74.0gr with the 220smk.
OAL ended up being about 3.52, win brass, rem 9 1/2M primers.