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I believe it was 1948 when they went from the square bolt of the 1936/36 Model to the 336 Round bolt. It strengthened the receiver by doing this and also probably simplified manufacturing and reduced costs of manufacture.
I believe the first square bolt models came out in 1888/89 and were manufactured until 1948 for a total of 60 years of production and the round bolt models have been manufactured for 68 years so far with lots of newer cartridges introduced at higher pressures and performance.
The Henry rifles are shortened 336 actions in the pistol calibers and full length in the rifle calibers.
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