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Picture of henryrifle
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I need some advice. I have an older Remington 700 that I am having rebarreled.

After dropping off the parts and discussing what I wanted to do, I realized that I don't know enough about chambers to know what to ask for. Having only shot factory barrels, I only know how to work with what I have but don't know what I want.

As stated above, the action is a '84 Remington 700 chambered in .308. I am not changing calibers. The barreled action will be mounted in a MDT TAC21 Chassis and I will use it for long range shooting at 1000 yards. I'd like to load to magazine length, 2.84", but, if that is a detriment to accuracy it is not a requirement. I have been shooting 175 gr. SMKs and TMKs and experimenting with 178 gr. Hornady ELD-Xs. I also have some Nossler 175 gr. RDFs.

This is not a competition rifle as I am not engaged in any competitive shooting endeavors.

What would you suggest I request of the shop with regards to chamber and other aspects that I am likely unaware of?

The new barrel will be 24" and will have a 1/10 twist. The barrel brand is Rock Creek.

The action is being trued.

Thank you for your help,
Henryrifle
 
Posts: 437 | Location: Atlanta | Registered: November 11, 2009Reply With QuoteReport This Post
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Picture of Expert308
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Factory 700 .308 barrels have really long throats in their chambers, long enough that you can't seat a bullet out to the lands and still have it far enough into the case neck to keep it stable. Be sure to talk to your smith about it and have him cut the throat appropriately for the range of bullet lengths (which do NOT necessarily correlate to bullet weight) that you plan on using.

Besides doping wind conditions (which is a skill that requires many many rounds of practice) and a fundamentally accurate barrel and load, one of the big keys to success at long range is keeping the bullet supersonic all the way to the target. A 175 or heavier bullet in a .308 will do it as long as you launch it with a sufficient velocity. Duh. Sounds like a pretty obvious thing, but some factory ammo isn't loaded hot enough to stay supersonic out to 1000 yards. If you're handloading, which it sounds like you are, you have a lot more flexibility in bullet and powder selection, charge weight and seating depth, all of which factor into muzzle velocity.

If you're not dead set on sticking with .308, you might consider something like a 7mm-08, 6.5mm-08, or 6.5CM. It would give you equivalent or better ballistics with somewhat less recoil (140 or 150gr bullet vs. 175-185gr). The 6.5CM is also a slightly shorter case, which would allow you to seat your bullets out a little further (maximizing use of case capacity) and still be able to feed from the magazine.
 
Posts: 4945 | Location: Portland, OR | Registered: February 12, 2007Reply With QuoteReport This Post
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Picture of fredj338
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If you are having it custom chambered, then you can have the throat anyway you like. Give your riflesmith a dummy round with the 175gr SMK loaded to the OAL you want, then ask for 0.010" lead in the throat. Some of the other rifle guys will chime in, but there are also min SAAMI specs for chambering. With some brass that may require neck reaming.


IF YOU AREN'T HANDLOADING, YOU AREN'T SHOOTING ENOUGH!
NRA Instruc: Basic Pistol & Met Reloading
 
Posts: 7643 | Location: ca, usa | Registered: February 17, 2004Reply With QuoteReport This Post
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Do what fredj338 suggested, give your gunsmith a dummy round with how you want the bullet seated. Bottom of the boat tail slightly above the neck/shoulder junction is common practice. I recently did the same on two Dashers barrels I just had chambered. FYI .004 neck clearance has worked well on every caliber I've had chambered. With the MDT chassis you can obviously use AICS mags. The AICS front plate can be drilled out and removed for a OAL of 2.98, might change how your dummy round is set up. I've removed the front plate on AICS mags, works great, no problems. Have fun!
 
Posts: 2327 | Location: 9860 ft above sea level Colorado | Registered: December 31, 2008Reply With QuoteReport This Post
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The dummy round thing is what I do also, but since I use VLDs, I ask for the bullet maximum diameter to be right at the lands.

Also, I can't help but think that if you're building this rifle specifically for LR shooting to 1000 yards, you would be doing yourself a favor by increasing the barrel length to 26 inches or maybe even 28 inches. The bullets you plan to use are not the greatest in terms of long range performance, by any stretch of the imagination, so you should have as much barrel as you can get. If later on you decide the barrel is too long, you can have it cut down and recrowned, but you can't add to a barrel.


Also, what contour are you looking at for the barrel?
 
Posts: 2623 | Location: Texas | Registered: June 20, 2012Reply With QuoteReport This Post
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+1 for the comments on dummy rounds. My latest barrel's chamber was cut for a specific round and it shoots great.

I don't have all that much experience with TMK ammo -- maybe 3 boxes each of 168 & 175 from Black Hills. IMO the TMK bullets didn't play well with a chamber that works well with SMK ammo. I've seen on other forums that the TMK bullets don't tolerate jump very well, and that the SMK bullets do tolerate fairly generous amounts of jump.

Thus, I suspect sticking to one bullet and having the chamber cut around that bullet, will produce the best results.
 
Posts: 4900 | Location: Colorado | Registered: January 26, 2008Reply With QuoteReport This Post
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Picture of fredj338
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IF you go longer barrel, go heavier too. My buddy has a F class savage, 30" bbl, You can literally see the barrel vibrate with each shot, like a tuning fork. it is his most finicky rifle for accuracy. My precision rifle is a 26" heavy in 260ai.


IF YOU AREN'T HANDLOADING, YOU AREN'T SHOOTING ENOUGH!
NRA Instruc: Basic Pistol & Met Reloading
 
Posts: 7643 | Location: ca, usa | Registered: February 17, 2004Reply With QuoteReport This Post
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I think if you see the barrel of a Savage vibrate, you're either having visions or the action is not bedded properly.

I have several friends who have Savage F-Class rifles, F-Open and F-TR and I have never heard of or seen that.

The usual contour for a target rifle or an F-TR rifle will be some manner of Palma contour. My F-TR rifle sports Heavy Palma contour barrels. They do not vibrate even at 34 inches long.
 
Posts: 2623 | Location: Texas | Registered: June 20, 2012Reply With QuoteReport This Post
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Picture of henryrifle
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Thank you all. I have made an appointment with the shop to bring in some dummy rounds and discuss these issues.

I am a little worried that I could make things worse by not really knowing what I am talking about but hope to get some guidance from them.

Thank you all again,
Hank
 
Posts: 437 | Location: Atlanta | Registered: November 11, 2009Reply With QuoteReport This Post
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Picture of swage
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As others have mentioned it depends on what bullet you decide to shoot. Bullets with smaller bearing surfaces will require less freebore to minimize jump. I've found the new Nosler RDF and Hornday ELD series to be jump tolerant and shoot very accurately out of my 6.5 CM. I always have my 6.5 CM barrels chambered to shoot the 140 ELD M. I don't bother with the Berger Hybrids, Lapua Scenars or VLDs as they are difficult to source reliably.

I guess in a long winded way I'm saying pick a match grade bullet that is easy to source and ask your smith what he recommends as far as freebore.
 
Posts: 1571 | Location: Ohio | Registered: October 17, 2007Reply With QuoteReport This Post
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