The Remington Model 8 (and the 81, which is mechanically identical) was an early self-loading rifle design by John Browning, and was produced from 1906 into the 1950s. It was available in 4 calibers initially, all of them being rimless, bottlenecked proprietary jobs - the .25, .30, .32, and .35 Remington. The .35 was the most effective on game and was the most popular seller, with the .25 being the lest popular. When the Model 81 was introduced (with a heavier forestock and semi pistol grip), it was also made available in .300 Savage. At that time, the Remington factory also offered to rebarrel existing Model 8s for the .300 Savage.
The Model 8 was a long-recoil design, something that saw little further development and remains one of the least-common types of action. It is interesting to compare the Remington 8 to the Winchester 1905/07/10 series of rifles that came on the market at almost the exact same time. Both were well-made and effective self-loaders, but with much different target markets and mechanical systems. Winchester opted to make a replacement for the pistol-caliber lever action saddle rifle, and did so using a simply and somewhat brute-force operating system: direct blowback with a heavy bolt and recoil spring. Remington, on the other hand, wanted to make a big-game rifle with very fast follow-up shot capability, and used the far more complex long recoil locked breech system. Both guns are largely forgotten by the gun-owning public today, although they both were widely used and appreciated by hunters for decades.
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