I will have my new 404 Jeffery on A Weatherby Mark V action (made by Wayne York in Pendleton, Oregon, stocked in a Pendleton stock) in a couple of weeks! Can't wait! I know some frown on the Mark V, but I'm happy with the ones I have. My 458 Lott has proven to be less than fun with full loads, if fired more than a few times. I've gone to Hornady 350's in it, at maybe 2600 fps. Recoil is manageable, but bullet has a rather low SD and a bad ballistic coefficient. Both factors are much improved with the .404. Am looking forward to shooting it !Why bother inventing things like muzzle breaks for people who cannot handle or do not like recoil? The gases that would propel the gun backwards (like a rocket) are lead out sideways or backwards, thereby drastically reducing recoil. Shooting offhand would be a highly inaccurate practice, which it is not. (just watch Olympic shooting disciplines). If it was, I would be dead twice over already as I had to shoot myself out of deep shit.
Bullets are most definitely in the barrel during recoil. A look at chamber pressure vs time curves and a simple calculation of bullet residence time in the barrel will confirm this. On a more experiential side, shooting my 458 Lott RSM confirms it: offhand & standing, the rifle impacts at point of aim at 50 yards with Hornady factory 500 gr soft points. If I sit at the bench and hold the rifle firmly down on a rest, it groups 6" left and 8" low at 50 yards. At the bench, my strong hold eliminates muzzle movement after firing; while standing, I let the rifle jump. The difference in impact point is the effect of recoil on trajectory. It's big, in this hard-recoiling rifle. It's negligible in a .22
Momentum is unchanged, unless the object is acted on by a force. It's conserved in elastic collisions. For every force, there is an equal and opposite force, which is the concept governing recoil. The recoil force starts when a force is placed on the bullet, which is the instant it moves some distance. The gun is reacting to the bullet's movement from the time it begins to move.