1911Tuner
Moderator Emeritus
It depends.
How heavy is the rifle and how heavy is the shotgun?
What is the velocity of the projectiles?
What is the mass of each projectile?
What is the powder charge in each cartridge?
Is the 45-70 loaded with 70 grains of black powder or 40 grains of smokeless? If so, you have to add the mass of the powder charge to the mass of the bullet. If the bullet's weight is 420 grains, and the powder charge weighs 70 grains...that's almost 15% of the total mass, while the smokeless charge is less than 10% of the total.
What about the stock design? All else being equal, stocks with a lot of drop make recoil hurt more, giving the impression that it's more severe. If the stock directs it more straight back, it moves you further than the other one...again, all else equal.
How heavy is the rifle and how heavy is the shotgun?
What is the velocity of the projectiles?
What is the mass of each projectile?
What is the powder charge in each cartridge?
Is the 45-70 loaded with 70 grains of black powder or 40 grains of smokeless? If so, you have to add the mass of the powder charge to the mass of the bullet. If the bullet's weight is 420 grains, and the powder charge weighs 70 grains...that's almost 15% of the total mass, while the smokeless charge is less than 10% of the total.
What about the stock design? All else being equal, stocks with a lot of drop make recoil hurt more, giving the impression that it's more severe. If the stock directs it more straight back, it moves you further than the other one...again, all else equal.