12 gauge birdshot recoil

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Most loads marketed as "target" will have the least amount of recoil. They're generally number 8 shot.
 
Recoil will be in proportion to the weight of the load and it's velocity, shot size will not be a significant factor.

1 oz will recoil softer than 1-1/8 oz at the same velocity.

Likewise, a 1 oz load at 1200fps will recoil less than a 1 oz load at 1300fps.
 
Howdy

Recoil is not really related to the size of the shot. There will still be 1 1/8 ounces of shot, or 1 ounce of shot, or even 7/8 ounces of shot in the shell, no matter what size the shot is. Recoil is related to the weight of the projectiles and the velocity it leave the muzzle at.

For a long time, the lightest recoiling loads on the market were marked 'light target' loads. These usually had either 1 1/8 ounces or 1 ounce of shot in them. They were usually marked as '2 3/4 drams' although that practice is going out of fashion now. They most commonly had #7 1/2 or #8 shot in them. A 1 ounce, 2 3/4 dram 'light target' load will recoil less than a 1 1/8 ounce. 2 3/4 dram light target load.

Winchester makes a load they call the Winlite Low Recoil Target load. Sometimes they are called 'feather light loads', but that is not the official name. This is probably the lightest recoiling load of all, but they can be hard to find.

http://www.basspro.com/Winchester-AA-Low-Recoil-Low-Noise-Target-Loads-Shotshells/product/67999/76045
 
Another light load is the Winchester "Xtra Lite Target", 1 ounce 2-3/4 dram loads. These are more commonly found than the WinLites (26 gram 2-1/2 dram).
 
A load of 1 oz of #6 shot has exactly the same recoil as a load of 1 oz of #8 shot. Shot size has nothing to do with it. Pay attention to 2 or 3 other things.

#1 The shot weight. Traditionally a standard 12 guageload had 1 1/8 oz of shot in any shot size. But you can buy shells with 1 1/4 oz, 1 1/2 oz all the way up to 2 oz or even more the longer shells. There are shells available with 1 oz and even 7/8 oz. The less the weight of the shot, the less recoil.

#2 How much powder. Traditionally this was listed as the Dram Equivalent on the box. This is an old holdover to the blackpowder days. If a box is listed as 3 Dram Eq, it means that it is loaded with the equivalent of 3 drams of black powder. If you see this information on the box, the bigger the number, the more powder and the more recoil.

Many companies are no longer listing the Dram Eq. and are simply listing the velocity of the shells in that box. You my see something like 1200 fps, 1300fps, or 1400fps stamped on the box rather than the dram eq info. The faster the speed, the more powder and more recoil.
 
Get a gas operated 12 gauge shotgun like the Remington 1100, very light recoiling even with heavier target loads.
 
No, that equation has no relevance.

If you are equating recoil, the formula you are looking for is:
m1v1=m2v2
where m1 = the projectile mass, shot + wad + ejecta (mass of burned powder gas)
v1= muzzle velocity of projectile mass achieved during firing
m2=mass of gun
v2=recoiling velocity of the gun

If any three of these variables are known, it is simple math to solve for the fourth.
 
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