The 16ga F2 is not a low pressure load, while the length is 2 5/8" the pressure is 9857psi. So it's a bit hot for vintage guns proofed for 3 1/4 Ton.

They do thump you, but they do work great in a heaver gun if your not shooting a ton of them as others have said.

Good Luck!

Greg


Gregory J. Westberg
MSG, USA
Ret