Thoms got it right. I'd get a few different kinds of bullets (I'd at least try 250gr SSTs and 240gr XTPs at first) and then work your powder charge up from about 80gr until you get some good groupings.

Some MLs will NOT perform at mag charges, 120gr+ and the shooters will have to settle for the lower velocity they get in turn for more accuracy. However, get the right bullet and you will probably get something you can push faster if you really think you need to.

See, Thom is shooting only 90gr T7 3f (roughly equivalent to 100gr of the powder I use) with the same bullet I push with 130gr pyro RS to get accuracy, and we have the same gun! I won't shoot lighter charges, cause I'm expecting longer shots in the wide-open areas I hunt.