I tried several powders in my Ruger .264 for an article in HANDLOADER, and Ramshot Magnum, Reloder 25 and Retumbo worked best. In my rifle 63.5 grains of RL-25 shot the smallest groups woith 140's, and showed zero signs of high pressure with cases or over the chronograph, even though it's 3.5 grains over Alliant's max. But am in the process of trying some even slower powders now, which are more temp-stable than RL-15--though 25 would work fine if you're not hunting in widely varying weather.
I should add that in my first .264, a pre-'64 Model 70 Westerner, Magnum turned out to be the best powder with 140's. There wasn't any published data then, but the load I settled on (68.5 grains) turned out to be just about exactly what Ramshot lists as their maximum among 140's today. It got around 3220 fps and very good accuracy from the 26" barrel.
Hi John,
How temp-stable is Ramshot Magnum
Thanks
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