.221 load data

[earschplitinloudenboomer]

Rocky Raab;
...this is a project gun, made waaaay back. Mark X Mini Mauser,
originally in .223, had the chamber cut shorter and reamed for .221 (this was before even Kimber was chambering for this carttridge)...so, also have issues with the 1 in 9 twist. Went through a lot of powders and bullets, trying to duplicate Hornet, some shot good but not great. Started up in bullet weight through the 40gr, got up to 53gr and got the accuracy I'm looking for (1/2 inch at 100 from a bench rest), however, this is with 17.5grs of IMR4198. Going to 55gr. spitzer boattails next, since I'm going to a new bullet I thought I would try new powders. The RL7 you guys suggested sounds like just what I'm looking for.
Thanx.