Start as long as your mag allows, try 42 or 43 grains to start, and see what that gets you. You might want to check to see how far off the lands mag length seating puts you at, but you're talking hunting bullets, presumably stuff you won't be using primarily for PDs, so do you really need itty-bitty, teeny-weeny groups to plug your deer across 600 yard clear cuts at distances that likely won't give you the expansion you want???
