The bullets travel unsupported down the chamber and can strike the chamber's shoulder shearing off lead. I know, I bought a .22 WMR Contender barrel that someone had been firing .22lr in. There was a nasty ring of lead at the end of the chamber. Evidently he did know understand what ".22 WMRF" stamped on the barrel meant.
Also the gas gets around the side of the bullets greatly reducing their power.
Isn't that enough?
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