Also, I would not use promo or other “hot” loads in original 2.5” chambered guns that have been reproofed for 2.75”. Just because the chamber will accommodate the shell doesn’t mean all 2.75” loads should’ve used. For me intended pressures are unchanged from original proof. Lengthened chambers don’t change that. I hear all the time that modern ammo (and the associated pressures implied) can be used if the gun has been reproofed with lengthened chambers. I don’t buy that.