That is a good point to keep in mind Gil. I have Federal once fired, New Cheddite and once fired RST hulls on hand. I envision low pressure loading and a small increase in pressure over published old style hulls should be tolerable in current nitro proofed guns. Would have them tested to be sure they would be safe. One could also drop the charge a grains or two to lower the pressure and still have a suitable load for clays. Would be nice to make use of these hulls with a eco friendly wad column.