Rem 700 Coned Breach

[NZVarminter]

What can you tell me about doing a coned breach for the Rem 700. I am building a 6BR on a Rem 700 chort action, as a varmint rifle.

I currently have a Tikka T3 with 6Br barrel and the biggest problem I have is single feeding rounds. You drop them in the port, and the tip of the projectile hits the square face of the barrel end and just stops. You then have to flick it back and forward till it pops into the chamber. Feeding from the mag is reasonably predicatable, but not perfect either.

I've had a play feeding the 6BR cartridge from my Rem 700 in 6.5*47, and it looks like it will feed ok from the mag, but single feeding has same problem as the tikka. The projectile tip hits on the square face of the recess that leads into the chamber. Plastic tipped projectiles are not as bad, as the slipery platic tip slips on the square face so they will slide into the chamber, but any of the hollow tipped projectiles just stop dead!

When the round is sitting on the mag follower, the tip hits the recessed square face pretty close to the edge of the chamber, so I dont think it would need much of a chamfer on the leading edge of the chamber to solve the problem. Mayber 60-80 thou at 30 degres would do it.

I'm thinking I might be able to get away with a 80 thou chamfer without having to do a corresponging chamfer on the bolt face, or anything to the lugs?

I see PTG list a coned bolt, but I'm not sure whats actuallyy coned? is it the leading edge of the bolt head, or just the lugs??

How are others doing coned breaches on the Rem 700?

Thanks Grant

 

[jscandale]

Grant,

PTG also makes a breech face cone cutting tool that corresponds to the coned bolt face. Sounds like that would be a good solution o our problem if you are planning on rebarreling or setting the chamber back.

JS

 

[Mgordon]

If somebody really wanted a coned breech on a Remington 700 there are two ways of going about it.

1. Using the factory Remington 700 bolt head in its current configuration. You would need to find at what angle the O.D. of the bolt nose is to the O.D. of the leading edge of the bolt lug. You can cut a matching cone on a new barrel with .0100"clearance in front of the bolt in the locked position. Since the Remington 700 bolt needs clearance around the bolt nose, we know that the counter bore is for safety purposes only. I have seen plenty of Remington 700's come in the shop with out a counter bore on the barrel at all, its not right, but it works. So when rebarreling,
eliminate the counterbore and make it an angled cone.

2. Buy a PTG coned bolt, and single point cut the cone in the lathe to match. This is the best option because its the correct way to do it. Be advised that the coned bolt head may have trouble stripping
loaded ammo out of your mag box. Coned bolts are typically used for single shot applications.

Hope this helps.

Mark