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Old 05-25-2011, 07:24 AM   #1
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Default Questions about building precision 10/22

I'm looking to build a 10/22 to fill several purposes, open competition, fun, and maybe a little vermin thining. I've already got my fun gun 10/22 but I'd like a 22lr that can say to hell with tacks and drive pins. So I've got a few questions I'd like others to weigh in on.
I want to develop the build around 2 particular factory loads, all high-velocity from CCI so my first question is this, what is the optimum twist rate and length of a bull barrel for a 22lr bullet traveling between 1200 and 1450 fps?
The three CCI loads are the following:
Velocitor 40 grain CPHP 1435fps @ muzzle
AR Tactical 40 grain CPRN 1200fps @ muzzle
Select 40 grain LRN (this is just in case there's a shortage on AR Tactical, they're mirror image rounds by the looks of it save the copper plating)
Excluding human error the barrel and ammo match are the heart of accuracy in a rifle, so I figure its a good place to start.
So can anyone give me any information or suggestions on good barrels and the length and twists?

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Old 05-25-2011, 08:54 AM   #2
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If you want to get serious about accuracy, you're starting with the wrong ammo. Using good match ammo will improve your accuracy before you even start changing the gun.

1:16 is the near universal twist rate for 22LR and you will be hard pressed to find a different rate because it works.

Barrels? Green Mountain, Volquartsen, Lilja - there are a lot of good 10/22 barrels out there, it's just limited by how much you want to spend.

Get good ammo with a good barrel, a good trigger and bed the action in the stock and you'll get an amazing improvement in accuracy over stock. After that you'll be chasing after ever diminishing returns.

Try RimfireCentral.com - Rimfire Community! for way more information than you want to know about making a 10/22 accurate.

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Old 05-25-2011, 12:47 PM   #3
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Thanks for the suggestions, I want to try and iron out every detail before I actually build the gun. I've always found CCI 22lr, especially the Velocitor to be pretty accurate, what would be a good place to start looking for match ammo?

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Old 05-25-2011, 01:04 PM   #4
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Quote:
Originally Posted by Ruzai View Post
Thanks for the suggestions, I want to try and iron out every detail before I actually build the gun. I've always found CCI 22lr, especially the Velocitor to be pretty accurate, what would be a good place to start looking for match ammo?
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Old 05-25-2011, 02:59 PM   #5
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In my experience, Lilja & Hart make the 2 best barrels for drop in 10/22. You've going to pay for them but you get consistency of .0001 and they come already hand lapped. Both of them are 1-16 twist with a finished length of 21".

RWS R50 and Eley Benchrest Gold have been my 2 top performing ammo with Federal Ultramatch and Wolf MT coming close. You'll likely want a rim thickness gauge to measure & sort by rim thickness.

You'll need to drop it in a good stock & bed it. I prefer Acraglas Gel from Brownells.

If I was you I'd mill the boltface to .043 rim thickness and radius the back bottom of the bolt for easier hammer reset with target (subsonic) ammo. If you need more detail or have questions fire away.

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Old 05-26-2011, 08:59 AM   #6
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I guess I am expecting a bit much to think Velocitor and AR Tactical rounds to perform outstanding results by just looking at statistics but the Velocitor is what I plan to use if I need to do pest control. Lapua and Eley look like they can be pretty accurate on their own so I'll have to get a hold of some of it when I finish the build.

Is it better to free float a barrel or bed it? Most of the stocks I see by just glancing through the options for stocks are free float designs. Which is a better process accuracy-wise?

I did plan on getting a rim-thickness gauge, got that on my tool wish list.
Can you explain why I'd need to mil the boltface to .043 rim thickness? I can do it, I just dont know why is all

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Old 05-26-2011, 10:51 AM   #7
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I have found the 10/22 I built from scratch actually likes Federal Target, 325 round boxes for $14.00 at Wally World, made for semi autos so less powder fouling. At 25 yards it will shoot 1 hole, at 50 it will open up to .5 to a little over .5 inches.
I have a Clark Custom Barrel, Clark Custom trigger job that breaks at 2.5 lbs with no creep. All the internals are standard Ruger with a Boyd Fire and Ice stock. PM me and when I return to the home 20 I will send you pics.
It cost around $600 to build but it is a blast. At 25 yards I shoot the small air soft ammo off of golf tees without hitting the T. No Bull.

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Old 05-26-2011, 12:19 PM   #8
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Nothing wrong with your ammo choices, but be aware that 22 rimfires can
be picky. If you want the best accuracy that the gun is capable of, you
will need to try a wide variety of brands/loads and find what it likes. Then
go buy all of that load/lot number that you can find.

Don't be surprised if what YOUR gun likes isn't the high dollar match ammo.
It could be bulk pack cheap stuff.

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Old 05-26-2011, 12:54 PM   #9
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Just for $hits and giggles, try some CCI Standard Velosicity and see how it prints.

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Old 05-26-2011, 05:08 PM   #10
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Milling the boltface to .043 rim depth will minimize headspace. It leaves less "wiggle" room for the ammo in the chamber. My experience has proven that milling the bolt will give a slight edge in accuracy. Also I've noticed that the finished rifle will tend to like the bulk ammo a bit more-not as much as match ammo but better than with the factory setup.




Quote:
Originally Posted by Ruzai View Post
I guess I am expecting a bit much to think Velocitor and AR Tactical rounds to perform outstanding results by just looking at statistics but the Velocitor is what I plan to use if I need to do pest control. Lapua and Eley look like they can be pretty accurate on their own so I'll have to get a hold of some of it when I finish the build.

Is it better to free float a barrel or bed it? Most of the stocks I see by just glancing through the options for stocks are free float designs. Which is a better process accuracy-wise?

I did plan on getting a rim-thickness gauge, got that on my tool wish list.
Can you explain why I'd need to mil the boltface to .043 rim thickness? I can do it, I just dont know why is all
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