Re: Bore tech bullets for 338 Lapua
If you are seeing a plunger mark, your pressures are likely past SAAMI max pressure for the cartridge. It means brass is starting to flow/deform at the base.
Load data for lead core and solids of the same weight is not interchangable due to the longer bearing surface and higher land engagement forces with solids.
Since I get 250 gr Scenars to stay supersonic to 1,500 yards and don't get to shoot to 1,000 often let alone longer distances I just stick with them. They have been VERY accurate out of a 26" 1-10 barrel at 2950 fps