I could be totally wrong in my thinking, but the Edge is based on the slightly longer 300 RUM case. You could try chambering a piece of 300 RUM brass - if it chambers, would suspect it's an Edge. If it doesn't chamber, I would suspect it's likely a 338 RUM. Just a thought.
Check out Hodgdons reloading data online. They have data for 275 gr bullets- you should be able to start with that.
I couldn’t find data for the 285 gr Amax earlier so I looked that 275 gr and 300 gr bullets and kinda figured it out from there.
Good luck and be safe!
I have a Seekins Havak 6 CM and really enjoy the rifle. Shoots and handles very well. Factory ammo and hand loads shoot tiny groups. I’d have no hesitation about buying another!
I’ve shot my brothers Ridgeline 300 WM before and it shot great as well. You’ll see a lot of hit or miss reviews with...