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Author Topic: 22 MRF and 22 WMR  (Read 2158 times)

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Offline grumps

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22 MRF and 22 WMR
« on: March 22, 2009, 07:11:27 AM »
Can someone tell me the difference between these two 22's.  Will they interchange or are they rifle specific?  Stupid question I know, but the mrf bullets are so much cheaper, at least at the dealer I use.  Of course the mrf boxes of bullets are really old ones.
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Offline grumps

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Re: 22 MRF and 22 WMR
« Reply #1 on: March 27, 2009, 07:57:43 AM »
Ok I know they are different the MRF is shorter than the WMR.  I just wondered if the M's will shoot in a W gun with out buying them to see or if they would be safe or just cause a ring in the chamber.
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Offline mcwoodduck

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Re: 22 MRF and 22 WMR
« Reply #2 on: March 27, 2009, 08:07:00 AM »
One is a special version of the other.
The new 22Win mag is the larger of the two and you can shoot the older in them but not reverse.  I would hate for you to over pressure one of the neat older guns.
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Offline Rangr44

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Re: 22 MRF and 22 WMR
« Reply #3 on: March 31, 2009, 03:40:09 AM »
If you see ammo elsewhere, it's properly .22 WRF ("Winchester Rim Fire, IIRC), and not the ".22 MRF".

"M" generally denotes a magnum case, in rimfire ammo - which is why Winchester designated the newer/longer loading the .22 Winchester Magnum, using ".22 Win Mag" on their boxes, and others like CCI use ".22WMR".

Some old-timers refer to the WRF as the .22 Special, because it fits the longer .22WRM chamber just like the .38 & .44 Specials fit their longer respective .357/.44 magnum chambers.
Remington actually loaded their version with 45gr slugs as the ".22 Remington Special", once upon a time.

When I use it as a mild load in my magnum rifles, the POI difference usually requires a sight adjustment - not conducive to ammo switching in the field.

.
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Offline mcwoodduck

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Re: 22 MRF and 22 WMR
« Reply #4 on: March 31, 2009, 05:06:32 AM »
Every so often Winchester does a run of the older MRF and I have seen a brick or two worth of boxxes in gun shops.
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Offline grumps

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Re: 22 MRF and 22 WMR
« Reply #5 on: April 12, 2009, 04:34:46 PM »
So I can shoot the older 22 mag bullet in a newer WMR gun?   they sure are a lot cheaper than the real magnums but just a bit shorter.  But they won't hurt my gun,,will they?
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Offline mcwoodduck

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Re: 22 MRF and 22 WMR
« Reply #6 on: April 13, 2009, 07:13:04 AM »
NO.
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Offline Rangr44

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Re: 22 MRF and 22 WMR
« Reply #7 on: April 13, 2009, 08:32:38 AM »
[But they won't hurt my gun,,will they?] - No - But..........

Continuing use, w/o a good chamber scrubbing, will leave a carbon build-up at that point, which will either make the longer cases hard to chamber/extract, or very hard to extract after firing.
Extended continued use will erode a ring in the chamber at the shorter case mouth, exascerbating the problem.

What is cheaper in the long run, the shorter ammo, or a new barrel at some point ?

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Offline woodchukhntr

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Re: 22 MRF and 22 WMR
« Reply #8 on: April 13, 2009, 09:11:03 AM »
Quote from: Grumps on April 12, 2009, 04:34:46 PM
So I can shoot the older 22 mag bullet in a newer WMR gun?   they sure are a lot cheaper than the real magnums but just a bit shorter.  But they won't hurt my gun,,will they?

I believe you are asking if you can shooter the older .22 WRF in a .22 WMR (.22 magnum) barrel.  If so, yes.  Do not try to shoot a .22 WMR in a .22 WRF, if you can get it in the chamber it will be very dangerous.
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Offline Gohon

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Re: 22 MRF and 22 WMR
« Reply #9 on: April 14, 2009, 04:05:06 AM »
The 22 MRF was introduced as something with more power than the 22 LR.  Later the 22 WMR came out and the MRF fell by the way side.  Speed of the MRF is somewhere in the 1300-1400 fps I believe.  There advantage is they can be carried when those times arise that you don't need the destructive power of the WMR and of course they are quieter.  Point of impact will be different than the sighted in WMR but you can adjust for that with practice of holdover and windage for your gun.  As for harming your gun, don't worry about it.  It would take tens of thousands of rounds to show any type of erosion in the chamber. I've shot a few boxes at one sitting in my gun and there was no lead ring build up.  I suspect no one personally has shot enough MRF's to see this and besides after a couple boxes of MRF's and then a few WMR's, if there were the beginning of such a thing the WMR's would remove it.   If cost is the reason for shooting them then the 22 LR is a better way to go.  Some of today's 22 LR's are  fare more powerful than the MRF's and cheaper also.
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