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Chamber neck dimention for 6.5-06

 
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  #8  
Old 10-09-2013, 10:28 PM
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Re: Chamber neck dimention for 6.5-06

If you get a custom die, then what happens when you get brass that is thicker or thinner. Essentially your chamber clearance would change.

A tight neck enables you to outside turn any brass to get the clearance you want. IOW if one box of brass is .015" thick and you have a custom die that gives you .003" clearance, then when you get a box of brass that is .014" thick your neck clearance just increased by .002". Not a big deal but for a control freak it makes a difference.

IME most brass will have a thick and thin side. General consensus seems to be that if you have a variance of over .002" then discard or set aside for other use. With a tight neck you can do a complete turn (rather than just knock the high spots off). Theoretically then the off center neck will be fireformed by the chamber into alignment with the case body.

IOW if I were going to order a rebarrel or custom gun (planning on a 243AI soon), I would get a box of brass I intended to use, measure it and make sure that I could do a complete outside neck turn taking of at least .001" and probably .002" all the way around. That way I could be sure I could get to the exact neck clearance I wanted
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  #9  
Old 10-09-2013, 11:41 PM
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Re: Chamber neck dimention for 6.5-06

OK there is many issues being discussed here and lots of confusion.

1/ When you form a case down any imperfections or excess brass flows to the inside of the neck so many see inside neck reaming as the best option to get an even wall thickness and straight neck .

2/ When you expand up it's the opposite as most imperfection flows out so outside neck turning is the best to bring it back to external specs.

You have not said anything about what you intend to use the gun for as that would determine if you would even want or need a tight neck chamber .

When you expand up to form a case for a tight neck chamber you have to make sure that the resulting brass thickness can be turned to the diameter you choose .

So the chamber dimension has to match what the brass can turn to with respect to not going too thin .

284 has the right idea . Make up a formed case or two the way you think you like and then dummy load the bullet you will mainly use to correct OAL and send that off to get a reamer made to suit .
You can also decide if you want a tight base chamber , what distance the bullet ogive will be from the lands or even a tighter neck , so you can turn a bit more off the necks if you want . Conserving brass thickness is a good idea but not at the expense of concentricity and straightness .

You have to decide on the way you will form the case , get the gear to do that and then produce the dummy rounds after that the reamer makers should be able to advise you on the best way to proceed .

Dies are another issue but if you went Lee collet die for neck size the diameter difference would not be an issue if you can buy one . Failing that a bushing type die.
If you go standard factory 30-06 base Redding should have a 6.5 - 06 body die to handle that I would think as I have never bought one but if they don't a 25-06 with the neck drilled out a bit more (.008 more ) should do it.

You will have to work out what you expect the cartridge to do .
It's a complicated subject with many different side tracks and you picked a hard cartridge to work with. .
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  #10  
Old 10-10-2013, 04:42 AM
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Re: Chamber neck dimention for 6.5-06

Quote:
Originally Posted by Brewer View Post
Hi all, I am having Hart rebarrel a rem 700 LA to 6.5-06. I have bought some 30-06 Lapua Brass and was just going to size it with a .270 die and then a 6.5mm-06 FL die. so I have a question about what size I should have them make the neck of the chamber? I have heard that you might want it one or two thousandths bigger if you ware working the brass down instead of up? any comments or suggestions?
Thanks
I'd sure be talking to Hart before I order any reamers. A tight neck in 6.5 is normally .290" and Hart has that neck dia for a 6.5x284 chamber listed and they may not list all their TN reamers. Gunsmith normally have good collection of throat reamers varies dia.

This is listing of tight neck 6.5 from one of the gunsmith that builds some of my rifles

6.5x47 Lapua .290" Neck ,260 Rem. Ackley .290" Neck, 6.5 Swede .290" neck
6.5x55 Rogue (37 degree) .290" Neck, 6.5x.257 Roberts AI - .290 Neck
6.5-06 Ackley .290" Neck, 6.5x.284 Win. - .290" Neck

I do agree to make up some dummy rd with bullets then talk to Hart and see if you want to go with tight neck or something else. If Hart doesn't have your rifle yet might want to deal with one of the gunsmith on this site.
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  #11  
Old 10-10-2013, 08:27 AM
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Re: Chamber neck dimention for 6.5-06

Brewer:

Just saw this post - if you are still looking for info, I have some experience necking down Lapua .30-'06 brass for a custom 6.5-'06 AI with a .294" nk. If you're still interested send me a PM.
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  #12  
Old 10-10-2013, 09:13 AM
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Re: Chamber neck dimention for 6.5-06

Thanks for all the replies. so just to clarify, I am planning to use this rifle for hunting at ranges up to where I become comfortable shooting. I would think that would be in the 800-1000 yard range. Having said that, I don't have a good scope yet, so for now I am planning to use my 6.5-22X50 burris Fullfield II. I am assuming that will limit me to about 650 yards. I am thinking within 1 year, I will have the $$ to put an NF 5-22x56 on. Hart has my action. I am sure they will be able to do what I want them to, I just don't know what I want them to do. I probably have a couple of months because they are backed up that far. I guess my question is "what size should I have them ream my chamber neck to?" Again, I am starting with Laupa 30-06 brass (I bought 200 rounds so I am locked in on these). I have a Wilson Case trimmer with a reamer for .264, I have bought a set of plane jane Lee .270 dies, a Hornady .264 neck die and a Hornady .264 bullet seating die. Of course, just because I have a die doesn't mean I have to use it. if I find a better way to do something the die can sit on the shelf and I can buy another one. Thanks for any and all comments.
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  #13  
Old 10-10-2013, 09:35 AM
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Re: Chamber neck dimention for 6.5-06

Quote:
Originally Posted by Brewer View Post
Thanks for all the replies. so just to clarify, I am planning to use this rifle for hunting at ranges up to where I become comfortable shooting. I would think that would be in the 800-1000 yard range. Having said that, I don't have a good scope yet, so for now I am planning to use my 6.5-22X50 burris Fullfield II. I am assuming that will limit me to about 650 yards. I am thinking within 1 year, I will have the $$ to put an NF 5-22x56 on. Hart has my action. I am sure they will be able to do what I want them to, I just don't know what I want them to do. I probably have a couple of months because they are backed up that far. I guess my question is "what size should I have them ream my chamber neck to?" Again, I am starting with Laupa 30-06 brass (I bought 200 rounds so I am locked in on these). I have a Wilson Case trimmer with a reamer for .264, I have bought a set of plane jane Lee .270 dies, a Hornady .264 neck die and a Hornady .264 bullet seating die. Of course, just because I have a die doesn't mean I have to use it. if I find a better way to do something the die can sit on the shelf and I can buy another one. Thanks for any and all comments.
What you need to do is call Hart and ask what neck dia they use for the 6.5x06. If you can neck brass down load a bullet as you need to know what the dia is before deciding on neck clearance.

As to the 200rds of brass it may or may not last you the lifetime of your rifle and if you have a tight neck .290" it doesn't matter who's brass your going to use. If you have something set up for that laupa brass and some unknown reason you can't get anymore that could be a problem.

When I had 6.5x284 build I had .290" neck I could even use 284 brass beside the Laupa 6.5x284.
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