powder for 300 win mag

[stacy]

MY GO TO POWDER IS RL-22 WITH 185 BERGERS ONCE HELD A 1000YD RECORD WITH THIS COMBO FEW YRS BACK IN MY 300 WIN MAG

 

[KMG]

I think it will be a good choice for 225-240 grain bullets. Yes it's slow, but coupled with a long barrel, 28-30 inches. I think that I will get close to the same velocity as my 208's with h1000 load at lower working pressures. I haven't been able to test my high node test lots as of late, but looking to soon. All things being equal my load for the 208's has me running 76 grains h1000 & .5 moa. I ran a ladder test with the 225's & h1000 & maxed at 75 grains before pressure signs. RL33 maxes out at 81 grains, thats about max capacity without using a drop tube, that's 6 grains difference in max charge, approximately 7%. I also know that RL33 has about a 40fps per grain increase +/-. This was observed on a 6.5 saum based wildcat that load for.

 

[KMG]

Do you think RL33 will give better velocity or is it too slow ?

Did more test loads for my 300wm with Hor. 225bthp's & RL33, to find higher nodes. It was kind of like picking a favorite child. Everything was .75 moa & better @ 100yds. Best groups were .4moa @ 77.8gr & .550moa @ 80.2 grains. I lost some light during the last bit of testing so my chrony was not reading reliably. But based on the info I've compiled from previous chrono readings I can safely say that the 80.2 load was running in the 2900+ range. 80.2 grains was my highest charge during this outing, but I'm going to try higher as the groups were just getting better as the powder charge increased. In my initial tests my ladder stopped at 81 grains with only a slightly flattened primer. I know there is the case capacity for more powder & possibly more velocity but there is that point of diminishing returns. That said I'm a curious bird & I'll probably run 80.5 upto 82 grains just to see what's possible. This wouldn't be my first rifle that had it's accuracy node above a book max charge either..