Re: 300. wsm Loads!! First time ever!
Not the same cartridge/caliber, but I shoot a lot of RL-22 for my 7mm Rem. I my 257 WSM I have shot a lot H414, but that is more because I have a lot of it in my arsenal. It shoots good enough and I didn't notice much variance with other more "case filling" powders. I do really like the H414 because it measures SOOOOOO easy compared to chopping the RL-22 in the powder measure.
I HAVE NOT VERIFIED THIS, but this guy says it is his favorite load for his 300 WSM:
67.0 grReloder 22 3,000 fps2.84" Fed LR guestThis is the most accurate powder bullet combination load I have been able to get for my Savage 12BVSS 300 WSM. I get 1/4 inch groups @ 100 yards using Hornady 180 gr. SST with 67.0 grs. of RL-22 using Winchester brass, Federal Large Rifle Match primers.
Be aware too, (and I have not personally had this problem), they claim that RL-22 is both temperature sensitive and can vary quite a bit from lot to lot. I have shot probably 20-25 lbs of this over they year and no problem, but just search for RL-22 and varying and you will find quite a bit of posts.
RL-22 is a favorite of mine though...