Re: Subsonic 260 rem Loads?
I have thought about the same thing. You will want to use a 140 or 160 grain SP flat base, and look at Titegroup or Trail Boss powders. A starting point is the big question. I don't want to experiment with a custom gun!! As a start, I'd load up 10-12 grains of Trail Boss , and see what velocity you get. Then work it down from there. If something work, let us know!
Chad