I recently purchased a used Ruger 77 Mark II in 243 Winchester and just had a chance to shoot it for the first time yesterday. My first batch of reloads consisted of about 37 grains of some old DuPont IMR 4350 I picked up at a garage sale. It was originally sold for about $4 /lb from the original sales sticker. I combined this with 100gr BTSP and 87gr SP bullets and Winchester magnum primers. This was as much a sight in and function test using up old components as an accuracy test. Best groups at 130 yards were about 1.5 inches with no consistent pattern of vertical or horizontal string and no real difference between 87 and 100 grain bullets. The barrel on my 243 was completely free floated by the last owner. Having only put about 20 rounds down the tube, I'm still getting used to the rifle but I can fire tighter groups with my 223 and 308 in the 77 series. I created some more loads last night upping the powder charge with 4350 to about 39 grains and also putting together some loads with IMR 4831 to try. The newer IMR 4831 metered more smoothly for me. I'm not sure at this point how much the loads had to do with the accuracy but I'm thinking the rifle will need pressure at the tip of the stock. Has anyone experimented with bedding options in Ruger 77s?