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Cartridge retainer?The 12 has a cartridge tube magazine under the barrel, you mean a cartridge deflector? I've never seen one on a 12, that would belong to a 24.
A Remington Model 700 chambered for the 7mm 08 cartridge would be a short action as the cartridge is based on the .308 Win.
Since 1967
union metallic cartridge (company) The Union Metallic Cartridge Company of Bridgeport and Remington Arms Company were combined into one company and became Remington U.M.C.
The 7mm Ultra Mag is a Remington cartridge. THE model 70 is a Winchester rifle. Winchester does not chamber the Model 70 For the 7mm Rem. Ultra Mag cartridge.
100-1000 USD
I just so happen to own a Remington UMC model 10, actually it is pre model 10, they did not name this the model 10 until 1911 I believe. Mine actually has the dates 1903 and 1905 on it. But to get to your answer it stands for UNION METALLIC CARTRIDGE.
It's either a model 14 or it replacement 141, the cutoff would be 1935. The mOdel 141/141A was made in .30 Remington caliber from 1936 until 1950. The Model 141 Carbine was made from 1936 until 1942, also in .30 Remington caliber. The .30 Remington caliber was designed to compete with the .30-30 Winchester cartridge but without the rim that the .30-30 used. The reason for the spiraled magazine tube on the Model 14 and 141's is that the owner could shoot a more pointed projectile and not have the bullet tip rest against the primer of the cartridge in front of it possibly causing that primer to ignite that cartridge. A well designed rifle by John Pederson of the Remington design department.
Be Careful! Winchester did not make a Model 81.Remington made a model 81 Woodmaster in 30 Rem.cartridge.This is different than the 30-30 cartridge in the fact that the 30 Rem was a rimless cartridge and the 30-30 Win cartridge was a rimmed cartridge.They both headspace differently.
The Remington 22 special (used in model 12, 121, etc) is the same as a 22 WRF Occasionally Winchester or CCI will make a run of ammo but Remington doesn't anymore. Your have to search gun shows if you want to find some.
The Remington Model 66 is chambered for the .22 long rifle cartridge. The most common twist rate for the .22 long rifle is one full turn in sixteen inches (1:16).
If you are referring to the magazine latch style from the Remington Model 7400, yes it can be used on the Remington Model 740, but you'll also need to use the spring that goes with the newer style. These latches (newer style) are available in varying heights numbering from 0 thru 5 so you'll need to make sure the right height/size is chosen to get correct cartridge feed in your rifle.