Sighting in a new rifle
A month ago a bought a weatherby 307 in 300 win mag. Bore sighted the scope and put it away. Last weekend I decided to put it on paper. I have factory ammo but instead decided to shoot up a zip lock baggy of assorted 300Win In the baggy was my old handwritten note that said “not my reloads”. Huh, I didn’t remember. I looked over the ammo. All brass said 300Win. About 40 rounds. The bag held 2 types of bullets. Some short stubby ones (maybe 150’s) and some really long ones. I was wondering if the long ones would stick in the rifling so I tried one. They chambered fine. I know I know I should have pulled the lot but I really wanted to get this gun on paper. My range is 100 yards across my pond. Picked a spot at 40 yards in the water. Bang, perfect hit. Took another shot and it hit 4 ft high. Then far to the left. Then back on target. Checked the scope screws and a crude bore sight (look down barrel and scope). All seemed fine. The next 20 rounds were all over. Some even appeared to double splash in the pond. Never hit my target at 100 yards. Frustrated I got a full sheet of plywood as a target. The next 6 shots missed the plywood. Almost ready to give up I took a closer look at the reloads. The stubby ones were .308. The long ones were .277. Aargh. Somebody was shooting a 7mm/300W. Took out the factory ammo. Guns shoots amazing. I threw away all remaining reloads and destroyed the used brass. Thought my momma raised a smarter son.