6MM Remington down to 6XC setback

[delivery_boy]

Hi all,

I have a Maddco No3 barrel chambered in 6mm Remmington and a short action Stiller. If i have a smith cut the barrel tennon back and re-thread can he just run a 6XC reamer in and clean up the chamber say .010"?

Thanks

Delivery_boy

 

[cdparker]

IIRC, The 6XC is a .243 held 0.135" short.

HTH

 

[shortgrass]

Hi all,

I have a Maddco No3 barrel chambered in 6mm Remmington and a short action Stiller. If i have a smith cut the barrel tennon back and re-thread can he just run a 6XC reamer in and clean up the chamber say .010"?

Thanks

Delivery_boy

0.010" probably wouldn't "freshen" the throat.

 

[delivery_boy]

Hi all,

I have a Maddco No3 barrel chambered in 6mm Remmington and a short action Stiller. If i have a smith cut the barrel tennon back and re-thread can he just run a 6XC reamer in and clean up the chamber say .010"?

Thanks

Delivery_boy

0.010" probably wouldn't "freshen" the throat.

Thanks Shortgrass, the donor barrel only has 200 rounds down the pipe. Should be ok I think.

Delivery_boy

 

[Ggmac]

Not to be stepping on toes but , you aska question , get a good answer , than choose to ignore it and dowantyou want anyway ?
I would do as short grass says , go more than 010 , unless you know what're reamer was used to cut the 6 rem your leade may be too much for the 6 xc or at min at a dif angle , 1*30 vs 2* whatever .

 

[Ggmac]

Forgot to mention the freebore length and diam plus the mention leade angle .

 

[delivery_boy]

Not to be stepping on toes but , you aska question , get a good answer , than choose to ignore it and dowantyou want anyway ?
I would do as short grass says , go more than 010 , unless you know what're reamer was used to cut the 6 rem your leade may be too much for the 6 xc or at min at a dif angle , 1*30 vs 2* whatever .

Not worried about toes Ggmac, just want the best answer not the first answer I'd be silly to take the first piece of advice offered from an unknown source on the Internet.

Shortgrass mentioned refreshing the throat, i answered with the info I have that the barrel has only fired 200 rounds and that in my opinion throat erosion shouldn't be a major factor even with 6mm Rem's powder charges.

Of course I want the best result I can get and if that means running .300" deeper I will but I want all the information I can he before I make a decision. I don't have a lot of Knox form to play with which is why I'd prefer to remove as little as I can. No point paying for chambering and threading twice.

As for Freebore and leade angles. I had assumed that given the XC has been designed to run much heavier bullets than the 6mm Rem ever was that the XC reamer would easily extend beyond the reach of the original 6mm Rem throat even if it only just cleaned up the neck shoulder junction.

Thanks for your input.

Delivery_boy

 

[Ggmac]

Having played with a lot of 6 rems the diam of the throat / leade may be a bit larger than the more accurate xc throat /leade . Also the 6 rem was a dual purpose chambering , meaning heavy , long bullets were not what we now consider low drag , the heavy bullets were more of a pointed round nose for deer etc. in that design the leade angle would be dif than a modern target style bullet . If you know the reamer dimensions of the 6rem it would be easy to determine the correct amount to cut .
I understand about keeping as much barrel as possible but having a leade or throat 2 dif diam could really mess up accuracy or having you question what's wrong . I've got a copy of PTG reamer prints but it covers his cuts and Saami .
Gary

 

[delivery_boy]

Having played with a lot of 6 rems the diam of the throat / leade may be a bit larger than the more accurate xc throat /leade . Also the 6 rem was a dual purpose chambering , meaning heavy , long bullets were not what we now consider low drag , the heavy bullets were more of a pointed round nose for deer etc. in that design the leade angle would be dif than a modern target style bullet . If you know the reamer dimensions of the 6rem it would be easy to determine the correct amount to cut .
I understand about keeping as much barrel as possible but having a leade or throat 2 dif diam could really mess up accuracy or having you question what's wrong . I've got a copy of PTG reamer prints but it covers his cuts and Saami .
Gary

Thanks Gary, I'll try and Overlay the reamer prints as you say get it wrong and it's a pointless exercise. It may mean I end up going .243AI to stay longer rather than the shorter XC case.


Thanks.

Delivery_boy

 

[shortgrass]

You need a chamber cast of the 6mm Rem. chamber so neck diameter can be measured. I had my XC reamer made so I have .003 clearance with Norma brass. Many things to be checked before doing any cutting.

 

[delivery_boy]

You need a chamber cast of the 6mm Rem. chamber so neck diameter can be measured. I had my XC reamer made so I have .003 clearance with Norma brass. Many things to be checked before doing any cutting.

Thanks Shortgrass, my mate has some cerrosafe, I'll get a cast done and measured and compare to my smiths reamer. I'm trying to avoid ordering my own reamer if possible. Throating a custom throat is easy but reducing neck clearance may not be if the reamer neck is big.

Thanks for the replies.

Delivery_boy

 

[shortgrass]

Heck, the difference in neck length between the 6mm Rem. and the XC is more than 0.010",,,, with the 6mm. Rem being the longer of the two. The 6mm Rem longer by approx. 0.050". So, there goes your 0.010 idea. What's wrong with the 6mm Rem. as it is?

 

[Dusty Stevens]

Most gunsmiths will start by cutting off the tenon then go from there

 

[dkhunt14]

Most gunsmiths will start by cutting off the tenon then go from there

I agree with this. Most want to make sure they get a new clean throat. Without this the work is in vain. 200 rounds and it has wear. More then you think. A lot of BR guys rechamber at 500 or so rounds. That is with a PPC which shoots a lot less powder then a 6MM Remington. They do that for a reason as the throat has wear. Matt

 

[Rflshootr]

If it were me, I would set it back at least the length of the neck of the 6 Rem plus whatever else is needed to get a complete fresh neck for the 6XC to avoid the possibility of a step in the neck plus you'd have a complete new throat.

 

[jaclthr]

Hello Sir,

If you could get hold of reamer prints of the 2 cartridges involved, you would have measurements you could subtract from each other and drawings you could overlay and know more exact differences between these two chambers and what it would take to make the 6XC out of a 6MM Remington. A 6XC brass and a 6MM Remington brass held next to each other would also let you see basic difference as well. My 2 cents anyway. Best of luck in your endeavor.

jaclthr