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I had a Sako Finnlite, fluted pencil barrel, in 22-250 that would start walking groups after the second shot if the barrel was not allowed to cool. The 22-250 is a hot round and will cause the barrel to quickly heat up. I also shoot the Hornady V-max 55gr. I sold the Finnlite and got the Sako Varmint heavy barrel and have no problem with rapid multiple shots. Get good scope mounts and during site in let the barrel cool after it starts heating and it should return to zero.
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