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Author Topic: 9mm TCM  (Read 8395 times)

Big Frank

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Re: 9mm TCM
« Reply #10 on: December 16, 2011, 10:41:41 PM »
The .17M2 wasn't safe to use in semi-autos. That's the only thing I know that was wrong with it. It deserved to die.
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tombogan03884

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Re: 9mm TCM
« Reply #11 on: December 16, 2011, 11:32:55 PM »
The  17 HMR is based on the 22 magnum case, the M2 was based on the 22 LR case, apparently while rechambered magnums could handle the pressure it did not work that way with the 22 LR  actions.

http://en.wikipedia.org/wiki/.17_HM2

Since the .17 HM2 is based on the .22 Long Rifle, converting most firearms chambered in .22 Long Rifle to .17 HM2 requires only a barrel change. The higher pressures makes conversion of semi-automatic firearms more difficult, as virtually all are blowback designs that are sensitive to pressure changes. Kits for the Ruger 10/22 and AR-15 platform have appeared, and they replace the factory bolt or bolt handle with a heavier one to increase the bolt mass and compensate for the higher pressure. Since the .22 Long Rifle is arguably the most popular cartridge in the world, the .17 HM2 has a large pool of potential firearms that could chamber it, and a huge infrastructure to manufacture the rimfire case it is based on. [2]
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