Since you're rifle has a 1-in-12" twist, you probably should stick with bullets 55 grains and lighter, as it probably won't stabilize the longer (heavier) bullets well and accuracy will suffer.

I'd also recommend you try Varget to start for powder. You might also try Hodgdon's new "Experimental Packs" of powder for varmint rifles. (BTW: Hodgdon powders are made right there in Austrailia, so you'll get the fresh stuff!)I use Varget and have found that it provides outstanding accuracy and is very consistant regardless of temp. The only major negative is that Varget is extruded (although the grains are very short which is good) and doesn't meter with great consistancy in my RCBS Uniflow powder measure. The variations in charge weight aren't large, and if you don't load close to max loads then it's probably not a problem. Being a stickler for consistancy I take the time to weigh every charge. Doubles my loading time, but the results probably worth it, if for no other reason than my own peace of mind.

Enjoy you're new rifle, and let us know when you find its "pet load."

Good Luck,

Mike