I have a Weatherby Backcountry in .338 RPM with the 18 in barrel. I originally wanted this rifle in this barrel length in order to use a suppressor and still keep the rifle a manageable length and weight. I have a Silencerco Hybrid 46 I was using on this rifle, direct thread attachment. I'm prepping for an Idaho elk hunt in about a month. It's been very hot here in Texas so I sighted the rifle at an indoor 100 yard range about an inch and a half high. The barrel gets hot very quickly - and it was still over 85 degrees in the indoor range - and I thought the larger group size was due to the barrel heating up. I was consistently getting the first round at the top of the sight-in diamond - about 1.5 inches high - and the next two about 2 inches lower. We has a cool front move through this weekend so it only got up in the 90s so I went to a 200 yard outdoor range . I consistently had first round close to the bull and the next 2 rounds 5 to 7 inches lower . I was also checking my Weatherby .280 Ackley at 200 with no issues while letting the .338 RPM cool so I was pretty sure it wasn't me. I was about to pack it in with frustration when I decided to see how it shot without the suppressor. I immediately shot a 1.8 inch 3 shot group at 200 yards, 5 MOA low and 2 MOA left, made the corrections and put 3 in the bull. Anyone else had this kind of problem with a suppressor affecting accuracy?