I may have a 300 weatherby in the works. i have a few questions. First off this rifle will be a Remington 700 with 24" barrel. I have heard the 26" is better for a case of this size but I don't like anything over 24". So I will deal with the handicap. Right now I have H4350, IMR 4350, H4831, RL15,17, and 19 on hand. Will any of these powders work good with this length barrel and a 180-200 grain bullet? Also, has anybody had any experience shooting the Speer 200 gr Hot Cor to Weatherby velocities? Will it hold up? I have only ever shot it out of a 30-06. Thanks for any help.