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One Shot

I shoot a 30-06 rifle with a handload I have used for years using a 165 Nosler Partition at 2800 FPS. The ability to shoot beyond 200 yards at a range or on private land is unavailable in my area. In the past I would chrono my load and consult a table or calculator for proper sight in at 100 yards (2-2.5” high) and I felt I was good with a par of out to 300 yards my self imposed absolute maximum. Two years ago I was mule deer hunting and shot a buck at 228 yards and I hit it a little high in the spine but it went down. Last year I was antelope hunting and the ranch had a long range target range with a 8“ gong at 300 yards I held on the top edge and shot over it, so I held dead center and I hit it 3 times in a row. This didn’t match the trajectory table but I thought it might have to do with change in elevation. The next day I shot an antelope at 325 yards and hit lower than expected by about 4” I thought it was me based on the previous day shot again with the same hold and same result so I held higher shot again and put I t down. I felt bad so I went back to the gong shot it holding dead center and hit it. We saw a mule deer at 294 yards and I shot it and it rolled over dead but the bullet hit high towards reds the spine about 5” higher than I would have thought. In June I went axis deer hunting in Hawaii and checked my rifle and it was 2” high at 100 yards saw a deer at 225 yards shot it and hit high in the spine a little back. Held low on shoulder shot again and put it through the shoulder and he was down for good. When I returned home I shot the rifle and it was hitting 2” high and 1/2 “ right at 100 yards. With a nice 1/2” group. I shot at 200 yards and I am hitting 4” high 21/2” right. Group sizes are 3/4-1” in size. I tested the scope it is good the rifle is grouping well. I have tried shooting it off a lead sled, sand bags, bench rest tripod, shooting prone over my pack with the same result. I purchased Nathan’s book on long range shooting (currently on page 300) and am open to learning. I have been shooting a long time and unless this loading breaks every rule of physics I am at a complete loss. I suspect it may be some flaw in my shooting form but my groups are good and consistent just not where they should be. Any ideas?