westernrover
Member
- Joined
- May 4, 2018
- Messages
- 1,613
The 125's won't do that without substantially more recoil. Use the Lucky Gunner results and find two loads that penetrated and expanded similarly. Punch the bullet weight, velocities and the estimated powder mass (from load data) into a recoil calculator and see which one recoils more in the same weight gun.
With similar caliber and expansion, to get the same penetration with a lighter bullet will require more velocity which in turn requires more powder mass. With the lightweight bullet at high velocity, the shooter is experiencing recoil from ejected propellant that never hits the target. The bullet is going faster, but has less momentum. Because handgun bullets have a lot of aerodynamic drag, they slow rapidly so that the advantage of a heavier bullet is even more pronounced the farther down range it goes. When the light bullet hits with less momentum, it also has less sectional density. It needs even more velocity to overcome all these shortcomings and penetrate as much.
With similar caliber and expansion, to get the same penetration with a lighter bullet will require more velocity which in turn requires more powder mass. With the lightweight bullet at high velocity, the shooter is experiencing recoil from ejected propellant that never hits the target. The bullet is going faster, but has less momentum. Because handgun bullets have a lot of aerodynamic drag, they slow rapidly so that the advantage of a heavier bullet is even more pronounced the farther down range it goes. When the light bullet hits with less momentum, it also has less sectional density. It needs even more velocity to overcome all these shortcomings and penetrate as much.