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I neck size all my six bottle neck calibers from .223 Rem to .378 Weatherby Magnum. However I only shoot cast bullets in them and all my rifles are bolt action. I do believe I get a bit more accuracy by doing so, but admit the difference is small. I don't believe neck sizing makes the brass last longer, as most brass get neck splits after X no. of firinigs. Lately I have started to neck size .444 Marlin & .45-70's that I shoot in Marlin lever action rifles...using .44 and .45 caliber pistol carbide dies...I only size the first 3/8" of the case neck with them
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