Accurizing 22 Rimfire (Modification tools}

darmtn1917 · Jun 15, 2019

Has anyone used any of the tools for modifying the bullet in 22 ammo? The PACO -WALTZ-D-ROCK are the ones that come to mind but I remember the little drill tips that made a small hollow point.
if you've used them ,what results did you get?

6string · Jun 15, 2019

Accuracy-wise, there's a wealth of info out there indicating that you'll get a lot better results by using one of the rimfire rim thickness gauges and sorting your ammo into batches that way.

Oftentimes, manufacturers offering different grades of expensive match ammo are really just selling the same stuff, simply sorted to differing levels of tolerances.

Jim

rockquarry · Jun 15, 2019

6string said:
Accuracy-wise, there's a wealth of info out there indicating that you'll get a lot better results by using one of the rimfire rim thickness gauges and sorting your ammo into batches that way.

Oftentimes, manufacturers offering different grades of expensive match ammo are really just selling the same stuff, simply sorted to differing levels of tolerances.

Jim

Sounds good in theory. Have you actually sorted ammo with a rim thickness gauge? What were your results?

AzShooter · Jun 15, 2019

I had the Paco tool years ago and I could see a difference in the ammo's accuracy. It was worth a few point on a Bullseye match but not worth the trouble of sizing the .22s all the time.

6string · Jun 15, 2019

Yes.
Results depend on the firearm used and basic ammo quality.
My testing is based on the use of single shot Hämmerli free pistols, model 152 electronic and model 160 mechanical, fired at 50 yds. Sorting club level Eley 22 ammo ($60-70 per 500) yielded results (10 shots under 1") close enough to Eley Tenex ($180-200 per 500) to make it worth the while. The rate of fire is so slow that the time spent isn't much of a bother.
The gun is capable of better, but you need a machine rest and indoor 50 yd tunnel.
Out of a Ruger Single Six or Harrington and Richardson, all bets are off! You're liable to find headspace variation chamber to chamber that equals or exceeds the variable in the ammo.

SSK (I think...) did make a tool to file the round nose of a 22 lr so as to resemble a SWC. Results were that it didn't hurt accuracy, at least out of hunting arms.

Rim thickness gauging is common practice amongst smallbore rifle match shooters. That's probably the direction I'd look if I wanted to get more info.

Best Regards,
Jim

PS: forgot to mention, easy way to "fake" machine rest test a free pistol is to clamp the barrel in a vise, using a split oak block to protect the metal. C clamp the whole thing to the bench. Easy to do on late Hämmerli FPs since you can remove the fore end.

kthom · Jun 15, 2019

I have a Paco Tool for both 22LR and 22Mag ammo. I used to buy Federal Lightening 22LR for about 9 bucks a brick from a local Gibson's store. They'd run them on sale about once a month. Fired a jillion of those at jack rabbits, praire dogs, and other vermin. I felt that a flat nose on those cheap lead 22LR bullets increased their efficiency as far as putting down those critters as compared to the OEM round nose on the 40 grain bullets, and I did not see any decrease in the accuracy of those I shot. But in those days, I used a flat file to trim the noses and it took a lot of time to get enough together to go out for a day of shooting. It occured to me that today, I could use my Dremel tool and make much shorter work of taking off that bit of lead protruding from the Paco Tool.

Hmmmmm? May just have to try that and see how it works! Still have some of that Federal Lightning ammo that's left over from the '70s. I collected a good bit of it! The stuff still goes "bang" just fine.

rockquarry · Jun 15, 2019

I did some work with rim thickness gauging ten or so years ago, but used guns and ammos that many people would commonly buy and use, not specialty target guns. I found some benefit to the process with some ammos, but results were often inconclusive. Incredibly tedious work that most people likely wouldn't do, even those with a moderate interest in accuracy.

I would imagine this is all very different for serious target shooters who would be far more inclined to gauge rim thickness and separate ammo accordingly.

CDR_Glock · Jun 16, 2019

I have had my best results using Any form of Eley, CCI, and Aguila, personally.

I’ve never modified an actual bullet and never tried that with a live round.

Sent from my iPad using Tapatalk Pro

sniper · Jul 21, 2019

Years ago, I had a Paco tool. Very consistent ammo, some increased slightly in accuracy, some didn't. But all in all, not really effective for the time spent OMNHO. I bought a piece of metal with a .22 caliber hole in the middle that allowed a small flat to be filed on the tip of the round. No harm to accuracy, and the smack was louder, indicating it would be more effective on smaller critters than round nose ammo. BUT being lazy...HOLLOWPOINTS will give about the same effectiveness and accuracy, I think, depending upon what your gun tells you it likes.

Walter Rego · Jul 21, 2019

Using the Paco Kelly Acu'Rzr tool increased the accuracy of non-plated, non "Target Grade" bullets in a couple of Ruger Single Sixes. At least for my Old Models, the chambers are bored straight through at .226" and .227" on a couple of my guns with no throats. In fact you can actually insert a round into each chamber from the front of the cylinder and it will go all the way to the rim.

However, rounds sized to increase the diameter of the bullets to better fit the Ruger cylinder (non)throats will not chamber in my Colts nor Smith and Wessons which have traditional and proper cylinder throats ranging from .223" to .225". Well maybe they would chamber in the examples that have .225" throats but I stopped when they wouldn't fit the .223" and .224" guns.

Nevada Ed · Jul 21, 2019

I messed around with CCI Quiet 40gr LRN bullets for Varmits
that are in my back yard.

Filed/sanded the tip down to a flat surface to see if it would drop
the ground squirrels any faster............ maybe?

I need to buy a mini drill bit setup but can't justify the cost for just a few shots each year, for the stand and drill.

The Quiet copper HP don't expand and put holes in my fancy plastic fence !!
Maybe ok if the neighbors are a quarter mile away ??

DWalt · Jul 26, 2019

Back many years ago, I tried segregating rounds by case rim thickness. In my Win 52B at 50' I couldn't see that it provided any improvement in performance. At that time I used mainly CCI standard velocity in matches and for practice as I seemed to get the best scores with it, even against the more expensive match grade ammo. I still believe that it is difficult to beat the performance of CCI SV ammo.

Accurizing 22 Rimfire (Modification tools}

darmtn1917

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6string

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rockquarry

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AzShooter

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6string

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kthom

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rockquarry

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CDR_Glock

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sniper

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Walter Rego

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Nevada Ed

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DWalt

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