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22-250 re-barrel chamber questions

 
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  #1  
Old 10-25-2012, 01:53 PM
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22-250 re-barrel chamber questions

I am getting ready to re-barrel my 22-250. The barrel that is on it is an Adams & Bennett F34 contour 1:14 twist. It never shot as well as I felt it should and I am pretty sure that the limiting factor is the barrel.


I am will have a 26" Shilen 1:12 twist #4 contour barrel installed. I think the change in twist and upgrade in barrel quality will go a long way toward getting the accuracy edge I am after.


However, one of the things I noticed about my first barrel was how long the chamber throat seemed to be. With 52g AMAX and 50g VMAX bullets, I was getting my best accuracy with a COAL of 2.435", with the actual length to the rifling being in the neighborhood of 2.5"( I don't remember exactly and don't have my notes in front of me. Somewhere between 2.475 and 2.515).


While all of my rifles, regardless of caliber or chambering, have shot most accurately with quite a bit of jump to the rifling, the length to the rifling of my 22-250 always seemed to me like it was a bit excessive.


Am I right that the chamber throat on my 22-250 is excessively long? If so, should I be looking for a different spec reamer or more care in machining the chamber?
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  #2  
Old 10-25-2012, 09:38 PM
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Re: 22-250 re-barrel chamber questions

Do you have your own reamer already ? If you do what is the freebore lenth of it . If it has to long of a throat you can have it reground a little shorter. I would not want any more than .025 to .050 free bore with 50 to 55 grn bullets.
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  #3  
Old 10-25-2012, 09:57 PM
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Re: 22-250 re-barrel chamber questions

I don't have my own reamer. AFAIK, the gunsmith that did the work for me cut the chamber with a standard reamer. I am not pointing fingers at the gunsmith. He has done a lot of great work for me.

I am just trying to figure out what needs to be done to avoid having the same problem with my next barrel. Not sure if my situation is normal for a standard 22-250 reamer or not. Maybe it is just an issue that I need to discuss with the smith who puts on my next barrel.
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  #4  
Old 10-26-2012, 08:41 AM
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Re: 22-250 re-barrel chamber questions

I shoot 50 grain bullets in my 22-250. I use Hornady SPSX and V-Max's mostly and 50 grain Balistic tips from time to time. I haven't been able to touch the rifling for the last 5000 rounds. I just seat them as long as will feed from my Ruger. They must be jumping a mile but still manages to shoot .3" 5 shot groups. I think bedding, barrel and crown quality are bigger factors than the distance to the lands.

If you are putting good money into a barrel job why not use the best barrel you can get? I am frequently asked who is my favorite. I don't really have any favorites but certainly have a short list of those i would rather not use and you have named both of them.
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  #5  
Old 10-26-2012, 04:07 PM
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Re: 22-250 re-barrel chamber questions

I have never been able to touch the rifling with bullets that I have the twist to stabilize. That, in and of itself, never really bothered me. I am not one obsessed with loading everything to "jam" length in the rifling. In fact, not one of my rifles has shot better touching the rifling. All of my rifles produce their best accuracy from .030 to .080 off the lands.

I worked up loads using 50g VMAX and 52g AMAX bullets. I also tried 55g Blitzkings and Hornady 60g soft points. Neither of those showed promise. The 50 and 52g bullets did OK and I was eventually able to get them down to around .6 for five shots @ 100 yards and around 2.5" at 300 yards.

The groups are not bad, but I would really like to do better with this rifle and I don't believe that is possible with the current barrel. The gunsmith did a first class job of installing and crowning the barrel. No problems there. I don't know enough about machining to evaluate the reamer used, so I am not sure if that is the cause of the freebore, if the freebore is the problem, or if the amount of freebore is normal for a 22-250.

Bedding is not the problem. The rifle is not stringing vertically or horizontally. Nor is it shooting the "double groups" that are a classic sign of bedding problems. It is shooting nice round groups. They are just not tight enough for me.

Hired Gun, I believe you correctly identified the problem when you mentioned barrel quality. The A & B barrel is obviously not a great barrel, but it suited my purposes when I initially had the rifle put together. It had some problems wth point of impact shifts related to fouling early on. I fire lapped the barrel (using only the three finest grits so as not to move the throat) to deal with that issue and it went away. The barrel has since shot just OK and just doesn't show the potential to do any better.

Personally, I have had very good luck with Shilen barrels and believe them to be quality products. FWIW, I have a 6.5-284 with a Krieger barrel that shoots very well. However, my Shilen barrelled 6.5x55 shoots right with it in the accuracy department.

I believe that the Shilen barrel that I intend to have installed will do a lot better than the A & B did. I feel it is of good enough quality to achieve my accuracy goals. My concern is making sure that enough attention is paid to the machining to ensure that the quality of the barrel does not go to waste.

That is the reason for my concern over chamber dimensions. Not knowing what is considered normal for a 22-250, I really don't know how to evaluate that.

Maybe a call to PT&G would be in order here...
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  #6  
Old 10-26-2012, 05:44 PM
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Re: 22-250 re-barrel chamber questions

www.saami.org will get you to a print of a SAAMI chamber
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  #7  
Old 10-26-2012, 08:27 PM
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Re: 22-250 re-barrel chamber questions

Megun from PT&G will email you the chamber print if you have the number off the reamer. She is my main man there and then we use Dave if I ever stump her.
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