Why does the weaker ammo run right ?

[Throckmorton]

I recently acquired a Kimber conversion kit to shoot .22 l.r. ammo in my Norinco 1911, and am mystified why Federal AutoMatch ,rated at 1200 fps will not cycle the slide fully....usually stovepipes...but CCI's OEM which is just 1070 fps fodder runs it fine time after time .Since i'm just plinking at steel plates I'd much rather have the cheaper A.Match run the gun.
Any thoughts on why the 'weakjer' ammo should run the gun and the more powerful just won't/ ????

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[Nwcid]

Is the faster ammo, "too much power" for the spring and moving too fast? I know that is not likely, but a thought. Also, are the bullet weights the same? That can affect recoil also.

While do not have a conversion, I have the dedicated Kimber .22 and I have run thousands of Federal 550 bulk box ammo with good success until the gun starts getting dirty.

 

[ilikegunspdx]

Solution:

Walther Arms 5170308 1911 Colt Government A1 22 LR 5' 12+1 Black Black Polymer Grip with Rail

<p>The Colt Government 1911 style pistol features a steel frame, loaded chamber indicator, threaded barrel, and polymer grips. The Rail model model features front/rear slide serrations, skeletonized trigger, 3-dot combat sights, and a beavertail grip safety. This model has a 5" barrel, black...

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Will run anything and accepts suppressors. 1:1 with a 45 acp 911 although a bit lighter.

 

[arrowshooter]

Is the faster ammo, "too much power" for the spring and moving too fast?

This could cause the slide to over run the mag. Strip the mag and give it a good cleaning, looking for wear spots, and try again.

 

[Richo877]

usually stovepipes

faster ammo, "too much power" for the spring and moving too fast?

I would think the higher velocity ammo is cycling the slide too fast and catching the brass before it could fully eject, causing the stovepipe. A lighter spring might help so it cycles marginally slower, giving the brass an extra millisecond to eject.

 

[po18guy]

22 semis are notoriously fickle. They are feeding a rimmed, essentially revolver round. Buy 5-10 different brands and 1-2 will run at 100%. Just the way they are.

 

[ilikegunspdx]

22 semis are notoriously fickle. They are feeding a rimmed, essentially revolver round. Buy 5-10 different brands and 1-2 will run at 100%. Just the way they are.

Speaking of inconsistency, look at all these factors: "Kimber conversion kit to shoot .22 l.r. ammo in my Norinco 1911"

That's why I say get a 1:1 1911 built from the start to shoot 22lr and only 22lr. The Walther/Colt is extremely reliable and consistent. Well built and inexpensive compliment to a centerfire 1911. Reliable with supers, subs, conventional suppressors, flow through suppressors.

 

[oremike]

It may not be the power of the cartridge, it may be the bullet shape the gun does/doesn't like.

 

[po18guy]

And the bullet lube can affect feeding/extraction. They all run at 24,000 PSI, which is way more than .38 Special +P, for example. But, that tiny little cartridge has to cycle a big, heavy slide. That's a lot of work for it.
Trivia: 22 Magnum runs at the exact same pressure as LR. There's just more of it.

 

[ilikegunspdx]

… But, that tiny little cartridge has to cycle a big, heavy slide…

Yep gun was not designed for 22lr (unless it was designed from the get go for that like the Walther/Colt one).

 

[deadeye]

Page 16 of owner's manual for their complete pistol, I suppose that it would be the same for conversions. I would try a variety and I see Rem golden bullet's have had good results along with mini mags.

 

[Unka-Boo]

All of the above....and you might check frame to slide fitment also...lots of variation and tolerance stacking when dealing with half a million different frames and a "one size fits all" conversion kit. They take time and patience to sort out.

 

[Certaindeaf]

Never believe what's printed on the box.

 

[TTSX]

Have you actually run those rounds over a chronograph? No? Then you have no idea which is more powerful. Get a chronograph.

 

[1911Fanatic]

Never believe what's printed on the box.

This^^^^
You never know what they tested it out of to get the velocities printed on the box, with most any ammo.

 

[po18guy]

I recently acquired a Kimber conversion kit to shoot .22 l.r. ammo in my Norinco 1911, and am mystified why Federal AutoMatch ,rated at 1200 fps will not cycle the slide fully....usually stovepipes...but CCI's OEM which is just 1070 fps fodder runs it fine time after time .Since i'm just plinking at steel plates I'd much rather have the cheaper A.Match run the gun.
Any thoughts on why the 'weakjer' ammo should run the gun and the more powerful just won't/ ????

Might email Kimber and inquire as to different rate recoil springs. If they do not offer them, then you can send your spring to Wolf and they can search for replacement heavier or lighter springs.