Perry, I believe everyone can make their own judgment about what pressure levels are safe in their guns. I attempted to locate the pressure for these shells, but was unable to find any data. If anyone knows the pressure, I would love to have the info. However with a 1250/1300fps 1/1.25 oz load my guess is that the pressures are in the 10,000+ range which I would deem too high for most of my vintage guns.

Owen