The 300 Gr. SMK with H-4831 is also a shooter. I shot a couple of 1.00" 5 shot groups @ 200 yds the other day to test the load. So, that is .5 MOA @ 100 yards. According to my external balistic program the 300 gr. has more drop @ 1,000 than the 250 Gr. by about 18". However, the energy is still there. I'm going to try it @ 1,000 if the wind ever stops blowing here in our valley. I'm wanting at least 1 MOA at 1,000 yards under ideal conditions.
I'm pulling the Surefire muzzel break off my Surgeon 338 Lapua and replacing it with a Holland break. The Surefire is okay..but it is set up to accomidate a Surefire Supressor ($1,800.00). I have a different supressor ordered ($650.00) ..waiting on the ATF paperwork to be completed. The Hollan break is a bit lighter and will unscrew when I want to screw the supressor on the Lapua.
I'm going to try the H-1000 with the 300 Gr SMK soon. I like the H-1000 powder in my 260 Rem...also in a Surgeon rifle..the best groups is with a 140 Gr. Berger VLD Moly coated bullet and 48 gr. of H-1000, .166" 5 shot group. It is very consistance "Bug Hole" groups.