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Originally Posted by Geo_Erudite
You have to compare rifles of equal weight. You're comparing apples to oranges. What is the kick if you had a custom Kimber Mountain Ascent chambered in 7mm Remington Magnum, more than 26.91 ft/lbs of recoil from the .280 AI I would guess. What is the kick if you had a rifle weighing 7.0 lbs for the 7mm Remington Magnum and the .280 AI?
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First off the Mountain Ascent action won't fit a magnum cartridge that is why you get a .280 AI instead. Plus by nature a 7mm RM will always weigh a little more in a factory rifle than a .270 Win or .280. I also made a few assumptions that these rifles would produce published velocities for loads that Nosler has online. You can go to hanloads.com and use their
recoil calculator to figure it out. However, with equal weight rifles you get:
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Rifle 7mm RM
Bullet weight in grains: 140
Velocity in fps: 3220
Powder charge in grains: 66 (IMR 4831)
Weight of firearm in lbs: 7.0
Recoil Impulse in (lbs sec): 3.17
Velocity of recoiling firearm (fps): 14.59
Free recoil energy in (ft/lbs): 23.13
Rifle .280 AI
Bullet weight in grains: 140
Velocity in fps: 3222
Powder charge in grains: 60 (IMR 4831)
Weight of firearm in lbs: 7.0
Recoil Impulse in (lbs sec): 3.07
Velocity of recoiling firearm (fps): 14.10
Free recoil energy in (ft/lbs): 21.62
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You get more recoil with the 7mm RM @ .49 fps and 1.51 ft/lbs of energy, but the .280 AI will always have a faster recoil impulse. This is probably so close you can't tell the difference. You can't have similar performance and not have similar recoil its just simple physics. So simply because the .280 AI's being offered are going to weigh less than the factory 7mm RM you're actually going to have to deal with more recoil.