Carey Farmer
Well-Known Member
I read a lot of posts about folks inching their powder charges up until they start feeling sticky bolt lift, then backing down their charge a percent or two and calling that safe enough. Does anyone know what chamber pressures are usually associated with sticky bolt lift, for the various cartridge diameters?
Based on a simple hoop stress model for a pressurized cylinder, chamber pressure for sticky bolt lift should be different for different cartridge case diameters. For example in Remington-pattern 1.0625" tenon barrels, sticky bolt lift should take 35% more chamber pressure in a standard (0.471" diameter) chambering than in an "ultra-mag" (0.551" diameter) chambering. That suggests that going up to sticky bolt lift pressure with say, 30-06 Springfield or .280 Remington cartridges might involve pretty high pressures.
Based on a simple hoop stress model for a pressurized cylinder, chamber pressure for sticky bolt lift should be different for different cartridge case diameters. For example in Remington-pattern 1.0625" tenon barrels, sticky bolt lift should take 35% more chamber pressure in a standard (0.471" diameter) chambering than in an "ultra-mag" (0.551" diameter) chambering. That suggests that going up to sticky bolt lift pressure with say, 30-06 Springfield or .280 Remington cartridges might involve pretty high pressures.