Had a strange thing happen this weekend. Kids are in a match kinda like Fclass, but scored electronically on a steel plate. So we have two dashers. The kids had shot 3 rounds of 10 shot strings at 500y with short breaks in between. It was 95 degrees outside (Texas). Gun was getting pretty warm. Ammo was in the shade. Targets got moved to 635y. So a longer break after the 500y series. Girls gun we had previously during warmup got a good dope to 635 using 3.4mils. First shots at 635 on warm gun where roughly 18" high. took us 5 shots to find the misses and move her down on the plate. Final dope dialed in at 2.6mils. After we got her on she held 3-4" vertical at 635y. Next heat my boy shot the same targets (different gun) and used his dope of 3.4mils. Dope was good. We got home I took the gun out with the remaining 12 rounds we had and the gun shot good out to 790y.
Both guns running 2956 fps. Girls gun 32.6 grains of Varget 105 hybrids. Boys gun is 32.7 of Varget 105 hybrids. No pressure signs both guns. Loads developed at around 75 degrees, but have been shot at 85-90 degrees.
Any ideas??? First I might add that the girl is 9yo and anything can happen at that age. That said after I dialed her down she held a 1/2 moa vertical for 5 remaining shots. I was initially thinking hot gun, hot ammo, hot mag equals pressure spike. But we had no heavy bolt lift. no ejector marks on brass. The calculation in the app says the 105's would have to be traveling at 3350 to get that same dope. I would think if we had that big of a pressure spike we would have the telltale signs
Both guns running 2956 fps. Girls gun 32.6 grains of Varget 105 hybrids. Boys gun is 32.7 of Varget 105 hybrids. No pressure signs both guns. Loads developed at around 75 degrees, but have been shot at 85-90 degrees.
Any ideas??? First I might add that the girl is 9yo and anything can happen at that age. That said after I dialed her down she held a 1/2 moa vertical for 5 remaining shots. I was initially thinking hot gun, hot ammo, hot mag equals pressure spike. But we had no heavy bolt lift. no ejector marks on brass. The calculation in the app says the 105's would have to be traveling at 3350 to get that same dope. I would think if we had that big of a pressure spike we would have the telltale signs
