I have done a small amount of research on this rifle and for the price point for a hunting rifle offering MOA accuracy with all of it's features, I decided to get one. I sold my only .308 And had quite a bit of ammo left over, so that's what I went with. I'm on a tight budget, so I chose the Cabela's Covenant 4-16x44 AO with the 30mm tube. My question to the group is this...Has anyone ever had problems with this or another weapon which had the 5R rifling throwing shots AS SOON as the barrel gets any sort of heat to it? The reason I ask is because while sighting in, I tried several various ammos to see which grouped the best. QUALITY ammo would normally touch the first 2 shots or very close to it. The 3rd would be anywhere from 1/2 to as much as an inch off. I take my time when I shoot and don't just throw lead down range so it's not like it was 3 shot rapid fire hot. The ammunition which performed the best was Winchester Ballistic Silvertip. All were 150 grain. To test the barrel heat theory, I recently went to Kentucky on a visit where it was much cooler. Temp was right around 50 as opposed to the 73 when I shot here in Tx. SAME RESULTS. at 200 yards , cold bore was DEAD ON. second was about 1/4 inch low right, and 3rd was approximately 1 inch lower but dead even. I was using a lead sled. Before mounting the scope, I ensured the bases were purple loc-tited to make sure they didn't come loose. Rings were loc-tited and torqued to specs. A also visually inspected the crowd. I wanted to make sure it wasn't nicked or damaged. Although I did it with the naked eye and a flashlight, it wasn't even scratched. The scope travels as it's supposed to and adjustments are accurate. the ONLY THING That is making sense to me is the barrel heating up. I am getting MOA(BARELY) as advertised, but as close as the first 2 shots are, this rifle has real potential. Would switching to a 165 or 168 grain round possibly help? This thing has me scratching my head!