Recoil from a 308?

Try this one. A slight variation of a 45 Raptor. I used a .458 barrel rather than .452. A rimless 460 S&W Magnum.




THIS recoils! I have replaced the mainspring housing with a flat one and curved the bottom corner of the house and frame, but it just plain hurts...can fire it three times in a row is all. Then I am done.