You guys are making me think that I need to try 4350 powder. I've never tried it in my 243.

I'm going to mention my load since I don't see it listed. My rifle absolutely loves 40.3 grains of IMR 4831 powering 95 grain Hornady SST bullets. I get .5" groups pretty consistently and I've had good performance on deer as well. The other 243's I have also shot it exceptionally well.