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Discussion Starter #1
I use my Mk4 Hunter for target shooting. Nicely made pistol but it does seem to be very sensitive to ammunition.

I’ve read a few posts on here but I want to be sure I’m on the right track.

I shoot 30 shot target matches and I used to shoot subsonic ammo in the Mk3 target pistol quite reliably. But the Mk4 continually malfunctions with these rounds.

I then shot only supersonic rounds in my Mk 4, sorry but I can’t recall all the brands, but I have been getting problems once or twice in a shooting series with the cases of fired rounds becoming caught in the ejection port, Case mouth pointing outward and held by the base.

It seems to chamber the next round OK at the same time, so after dislodging the empty case by flicking it by hand, it usually just means pulling the trigger to keep going again. Troublesome in a 10 second match.

The last lot of ammunition that caused the pistol to malfunction on an average of once in 30 rounds is Federal Auto Match.

I have now bought CCI Mini Mag and a box of Federal Premium HV Match to see how they go.

Any ideas?

Thanks...
 

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Put several hundred (yes) CCI mini mags 40 grain copper plated through the pistol. Shoot nothing else but these for a while. I bet things straighten out. And maybe shoot nothing else?
 

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Put several hundred (yes) CCI mini mags 40 grain copper plated through the pistol. Shoot nothing else but these for a while. I bet things straighten out. And maybe shoot nothing else?
Agreed. Ruger seems to prefer the CCI MiniMags. You may consider moving up in price to the CCI "Green Tag" for
matches.
 

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Discussion Starter #4
Thanks for the info guys...not seen the ‘green tag’ ones...I’ll look.

Yes, stick with mini mags for a while and see...😉
 

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I was having a few feeding issues.
It wound up being the new silver nickel mags were the culprit.
I switched out the folllower , follower button and spring.
Now everything runs smooth and flawless.
Also I ran a oil cloth back and forth through the mag body when it was gutted.




 

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RockyRiver, Feeding problems are way different than ejection problems.

Stewross, Before a gun will eject properly, the cartridge must develop enough thrust to overcome recoil spring tension, hammer spring tension, and friction. I've found using Standard velocity ammo when my MK III was new, there just wasn't enough thrust to reliably operate the bolt. I used high velocity ammo …. about a brick of it then tried Standard velocity again and it worked well. So, it may take a couple hundred rounds of high velocity ammo to condition the springs. Most MK Series pistols work with Standard velocity ammo right out of the box …. some don't.

BTW, CCI Green Tag is Standard velocity ammo and will probably not fix your problem. Try some CCI Mini-Mags …. they should work just fine. If you still have ejection problems with Mini-Mags, likely your extractor needs to be replaced. This is a very common problem with MK series pistols. The best solution is a Power Custom Exact Edge or a Volquartsen Sharp claw. Both are machined, not stamped like the factory extractor.
 

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RockyRiver, Feeding problems are way different than ejection problems.
LOL
It’s hard to be a gunsmith online without even pictures from the OP.
So I give my advice and you give yours.
I should of also said I replaced my stock extractors with Volquartsen extractors.
None the less I fixed my feeding/ejection/what ever you want to call a jam.
 

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RockyRiver, It's not that hard and 50 years of experience helps. I don't doubt you fixed your feeding problems with new mags but extraction/ejection problems are rarely related to magazines. In the OP's case, it's probably the Standard velocity ammo or possibly the extractor …. but NOT the magazines.

Just for the record, when a gun jams while feeding, (failure to feed) it is often a magazine issue. When a pistol fails to eject, feeding has nothing to do with the jam. Most likely, a failure to eject will end up as stovepipes or spent cases in the receiver whereas failures to feed are usually cartridges that get damaged when trying to feed …. usually stuck partially in the chamber. Think of it this way …. if the pistol malfunctions when the bolt is on it's way back, it's a failure to extract/eject. Further, residual chamber pressure will force a spent case to extract, however if the extractor doesn't maintain a good grip on the spent case rim, it will be released before the case head strikes the ejector and result in a stovepipe. If the jam occurs when the bolt is on it's way forward, it's a failure to feed. As I said above "Feeding problems are way different than ejection problems".
 

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I followed the instructions given by this youtube video: Ruger Mark III 2245 Magazine Tuning Tips and Tricks | TANDEMKROSS


Fixed my feed and stovepipe issues...
 

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I followed the instructions given by this youtube video: Ruger Mark III 2245 Magazine Tuning Tips and Tricks | TANDEMKROSS


Fixed my feed and stovepipe issues...
Stellgar, the OP is having ejection issues, nothing to do with feed and stovepipe issues. Doing the mag tune like the Tandemkross video shows is always a good idea with new mags if you have feeding or stovepipe problems.

I'd shoot only Mini-Mags for the first several hundred rounds. Check your extractor for burrs and full range of movement. Some smoothing of the extractor and the channel it rides in should help. If you are still having problems consider getting a Volquartsen or Tandemkross extractor.

After break in is complete, your Mk IV should have no problem cycling subsonic ammo or any other ammo, for that matter.
 

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I dunno, I was considering trading in my Mk III on a Mk IV, but reconsidered.. Kind of glad I did.. I have read of so many issues such as this one here, and on other forums as well. My Mk III is a pain to field strip to clean but really thats the extent of its problems.
No light strikes, fail to feed, fail to eject or fire ever..

what has ruger changed in the design to cause the many complaints??..
I thought the Mk IV was basically a MK III with a one button instant takedown.. I guess not.. bob
 

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The OP might have just got a MK IV that had a burr here and there, Ruger doesn't seem to spend a lot of time polishing parts.
Mine had a stovepipe bobble for the first few mags, it was a mag related issue.

Doing the TK mag tune (smoothing) got rid of the sharp edges, I have had perfect functioning since then.
I'm sure there are many other happy MK IV owners out there. Most of the complaints are from guys that get on here and gripe before giving the pistol a chance to break in.
 

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By no means am I a gunsmith and I defer to those more knowledgeable about that arena.

But, I've always had good luck running CCI Mini Mags in every 22 lr firearm I own.

Hope we hear back from the OP on this issue.
 

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I am not a gunsmith by any means. I was having some problems with ejections from my Mark IV target model and I was using Federal high velocity ammo.
I did tune my magazines following the procedure on the Tandemcross web site. I also ordered a new ejector and firing pin from Tandemcross and installed them. I rarely have an ejection problem now. I recently have started using CCI mini mags for most shooting but my ejection problems were gone before I switched my ammo preference.

I am not expert enough to know why my ejection problem went away.
 

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BTW, CCI Green Tag is Standard velocity ammo and will probably not fix your problem. Try some CCI Mini-Mags …. they should work just fine. If you still have ejection problems with Mini-Mags, likely your extractor needs to be replaced. This is a very common problem with MK series pistols. The best solution is a Power Custom Exact Edge or a Volquartsen Sharp claw. Both are machined, not stamped like the factory extractor.
I referred the "Green Tag" for match ammo.
 

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OpSysWiz, To the best of my knowledge, all match grade 22 LR ammo is Standard velocity rated at about 1080 fps from a 24" barrel. High velocity 22 LRs are rated at 1200 fps or higher.
 

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Discussion Starter #17
Tried my first 40 rounds of Mini Mag on Wednesday night...got two failures to eject spent cases...technically that’s worse than the other HV rounds.

Ah well I’ll keep trying...don’t know how many rounds I’ve put through the pistol so far...had it since they were available here...be well over 500 I’m sure...keep wondering if the breech block rebound spring on the guide rod assy. is too strong...or some issue with the extractor...I’ll have a look at it...🤔
 

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OP
Can you take a few pictures of the exact type of jam you are having and post it here ?
It does help us who are trying to help you with your problem to help you.
Just describing it too us sometimes ain’t enough and a picture or two is worth a thousand words.
Thanks
 

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To the best of my knowledge, all match grade 22 LR ammo is Standard velocity rated at about 1080 fps from a 24" barrel. High velocity 22 LRs are rated at 1200 fps or higher.
Then, just to be an exception to that "rule", there's Federal #719 High Velocity Match ammo, which they show as 1200 FPS.

good luck, garrisonjoe
 
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