I have a buddy who shoots a savage 110 in 243 which is twisted 1:9 so there fore your rifle probably is also, his rifle shoots the 100 gr. bullets like a house of fire using one of the 4350 powders,my coyote rig is a n old ruger 77 liberty model RS thats twisted 1:10 and mine tackdrives the 80-85 gr.bullets,I started using this 243 about 4 years back for calling coyotes and I just love this thing,even killed a few whitetails and a muledeer Buck,when this little rifle barks the quarry gets on its knees like right now, Ive been ringin wileys dinner bell now for 31 years and Ive hunted him with a 222 Rem. up to 25-06 even shot a couple with a 7mm mag.but the one rifle that has impressed upon me the most is this little 243 winchester,I dont know any other way to say it other than it is just AWESOME!!!!!! Hope you have the same experiance with yours,Good Hunting,Mike.....