Just scored a 24" barrel, express-sighted, Ruger No.1-A in .275 Rigby on GunBroker. This will be my first 7x57, or any 7mm for that matter. While awaiting delivery, I've been thinking about what I should feed it. I have prior experience owning No.1s in .223 to .375 Ouch & Ouch, so I'm familiar with most of the No.1's traits and how to deal with them. As I have some IMR 4350 on hand, I'm drawn to RevMike's suggested 46 grains of it under a 160 grain Sierra GK. I also understand that Ruger 7x57 throats tend to be longish. I would most appreciate any other observations, suggestions or recommendations you all might have.
