Re: 300 Weatherby Load Help
Thank's everyone for the information. It was exactly what I was looking for. It looks like I should give IMR7828 and RL22 a try (Does anyone know how well these powders perform in the 338 Lapua, my next project?).
Here is some more background on the rifle:
I bought the rifle when I was in college. It originally shot 2-3" groups. I left it with my dad to work up some loads for me (before I was equipped to reload myself). He couldn't get it to shoot any better, so as a surprise for me, he had it bedded and free-floated. So there went the factory 1.5" guarantee, at least without replacing the stock. The action and the first inch of the barrel were bedded. This did not help, nor hurt, the rifles accuracy. At one point I backed out the front action screw, inserted some folded business cards between the stock and the barrel, and shot groups while tightening the front action screw. Doing this I was able to get a 3/4" group, but didn't like the upwards pressure on the barrel.
Since then, on this last ditch effort to get it to shoot, I have done the following:
Purchased some Weatherby brand brass instead of the Remington brass. Prepped the brass by trimming all the cases to the same length, uniforming the primer pockets, deburring/uniforming the flash holes. Opened up the barrel channel more since the original 'free float' job was poorly done, having left some high spots that may have contacted the barrel during recoil. Tightened the action screws with less torque than before. Thouroughly cleaned the barrel and the chamber with Kroil, various powder and copper solvents, and JB's Bore Paste. Purchased some heavier bullets, since all previous loading and shooting was done with bullets ranging from 150 gr. to 168 gr.
This last weekend I worked up and shot some loads with the RL19 that I already had on hand and some 180 gr. SPBT SGK's. I tried several loads from 72.5 grains to 78.5 grains (all well below the max listed charge weight). Well Guess what!! ALL the groups were below 1.3"!! Most notable were 0.624" with 77 gr., 0.806" with 76.5 gr., and 0.907" with 78.0 gr.