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  #1  
Old 12-04-2018, 2:47 PM
Randy-S Randy-S is offline
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Default Gunsmith for Benchrest Rifle, Sacramento

Looking for someone who can help with a Stole Panda 22BR benchers rifle. Need chamber and twist rate verified. TIA
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Old 12-05-2018, 8:33 AM
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Twist rate is easy: Cleaning rod with a patch and jag, mark the rod and see how long it takes to make a revolution as you push it down the bore.

Chamber, not so easy. Any reason you think it's something other than advertised? Or are you trying to get chamber measurements?
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Old 12-05-2018, 11:11 AM
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smoothy8500 smoothy8500 is offline
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If it's like the 6mm BR choice I faced, chambers can be reamed for "Turned necks" or "No-Turn necks" on the brass. Probably a good idea to get a chamber casting.

Last edited by smoothy8500; 12-05-2018 at 11:14 AM..
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Old 12-05-2018, 11:26 AM
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Quote:
Originally Posted by smoothy8500 View Post
If it's like the 6mm BR choice I faced, chambers can be reamed for "Turned necks" or "No-Turn necks" on the brass. Probably a good idea to get a chamber casting.
The primary difference between no-turn and turn chambers will be the neck diameter.
This is easily measured with pin gauges dropped into the chamber.

For any given chambering (lets use 6br as our example), there are usually 2 very common diameters that get used.
In 6BR, that's 0.262" for turned necks and 0.272" for no-turn necks.

22br necks seem to run around 0.246-0.248 for turn necks and around 0.252-0.254 for no-turn necks.

Of course a reamer can be ordered to any neck diameter you specify, but pin gauges would show that too since they are in 0.001" steps.
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Last edited by ar15barrels; 12-05-2018 at 11:31 AM..
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Old 12-05-2018, 12:17 PM
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Quote:
Originally Posted by ar15barrels View Post
This is easily measured with pin gauges dropped into the chamber.

22br necks seem to run around 0.246-0.248 for turn necks and around 0.252-0.254 for no-turn necks.
I imagine this is the OP's concern with the rifle, which neck size he has. Would a Cerrosafe casting work for this measurement, or is a pin gauge the best option?
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Old 12-05-2018, 1:22 PM
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Quote:
Originally Posted by smoothy8500 View Post
I imagine this is the OP's concern with the rifle, which neck size he has.
Would a Cerrosafe casting work for this measurement, or is a pin gauge the best option?
A cerrosafe casting would tell you the neck diameter within a thousandth or so as long as the neck is properly filled by the casting.
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Old 12-05-2018, 9:58 PM
Randy-S Randy-S is offline
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I should have been more specific in my initial post. There are two common 6mm BR cases, therefore two common chambers. The case lengths vary by almost .040”. There is a 6mm BR Norma with a case length of 1.556” and a 6mm BR Remington with a case length of 1.520”. The same applies to the 22 BR. The question is: what is the length of the chamber in my rifle? I have a chamber length gauge coming from Brownell’s sometime soon. The Remington brass is scares to say the least, I have lots of Lapua 6 and 22 BR on hand. The chamber should be at least the longer of the two in order to use Lapua brass. I may need to find a reamer and someone to use it. Thanks, Randy
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Old 12-05-2018, 10:23 PM
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I have a 22 BR reamer, as well as 6BR Rem, 6BR Norma, and 6BR with a .262" neck. Not sure of the neck diameter on the 22. Will measure it tomorrow. Best way to tell your neck length is to make a chamber cast. I am relatively close to you in Oakhurst. The Brown Truck makes it even closer.
Let me know if I can help.
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Old 12-06-2018, 10:14 AM
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Quote:
Originally Posted by Randy-S View Post
I should have been more specific in my initial post. There are two common 6mm BR cases, therefore two common chambers. The case lengths vary by almost .040”. There is a 6mm BR Norma with a case length of 1.556” and a 6mm BR Remington with a case length of 1.520”. The same applies to the 22 BR. The question is: what is the length of the chamber in my rifle?
https://www.sinclairintl.com/reloadi...prod32925.aspx

You can also sacrifice a case by cutting a 1/16" ring off the neck and seating that ring upside down on the base of a flatbase bullet and then slitting the case neck long ways and seating the bullet backwards so its longer than you expect the chamber to be.
Now remove your ejector and chamber that test case and close the bolt.
The bullet will slide down into the neck as the slit neck has very little tension.
Extract the case and measure the overall length that the little 1/16" long piece of the neck was pushed back to and that's the maximum length of your chamber's neck.
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Old 12-07-2018, 7:57 AM
Randy-S Randy-S is offline
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Ok, again thank you for all the great replies. Someone suggested that I use a chamber length gauge from Brownell's. That worked perfect. I found the length of the chamber to be 1.586. The Norma brass is 1.556. At least it’s not 1.520. Opinions?
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Old 12-07-2018, 10:29 AM
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Quote:
Originally Posted by Randy-S View Post
I found the length of the chamber to be 1.586. The Norma brass is 1.556.
Opinions?
That's a completely normal differential between case and chamber lengths.
Don't let your cases grow beyond 1.580".

Also beware of neck diameters.
If your gauge was smaller in diameter than your actual loaded rounds, it will give you a falsely long reading.
You might still try my method by sacrificing a case and seating a bullet upside down as it will give you the max length for that actual neck diameter.
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AR work: www.ar15barrels.com
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Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
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Last edited by ar15barrels; 12-07-2018 at 10:31 AM..
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