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Abraham wrote:Thanks all for the responses.

Yes, I'm referring to .22 cal long rifle ammo.

In the latest issue of "Guns and Ammo", there's a list of various .22 cal LR ammo they tested. They listed Armscor as 36 gr, lead JHP on page 72, that they later refer to as plated. Created some confusion for me...

And, no they're not FMJ's, but simply plated or round nose, round nose being solids, so my referring to them as fmj's.

This is a great article, but they didn't mention what works well and doesn't in semi-autos as they did their testing with a single shot rifle.

Ah! So! Thanks for that information. I hope yo find the ammo that works the best. It is trial and error because what works in on firearm may not do so well in another, both accuracy and functioning. My Buckmark pistol has occasional hiccups with Standard ammo, but my SIG 1911-22 eats it up. I don't shoot hyper-velocity ammo in any of my semi-automatic 22's. There's a great little book by C. Rodney James on .22 rifle and ammo. I think Gun Digest published it.

First I have to ask where are you finding FMJ .22 LR ammunition? I assume you are talking .22 LR not .22 WMR since you said you are using it in a Browning Buckmark and S&W M&P 15-22. Though .22 WMR come in FMJ, Jacketed soft point and JHP I have never seen a .22 LR round with a jacketed bullet. The closest I've seen is plated, copper, bronze, etc.

To your question - I always check my .22 semi's with all the .22 loadings just to see how they react. HV down to subsonic to CB. Most of the time Standard Velocity is about as low as I can go to get reliable ejection and feeding. CB ammo doesn't even open the bolt most times. I shoot CCI Mini Mag .22 LR HP in my M&P 15-22 with no problems. It cycles Standard Velocity just fine also.