When I did my load development for my 264, I stuck to 140gr. For me then, the best powder was Ramshot Magnum. I tried all the usual suspects. I guess, it was almost 20 years ago, there wasn't as many as there is now. I used Hornady SSTs. Accubond 140 weren't available then. I got to do some loading and check them out. I think it might be a better choice in close without losing long range.
