DoneNOut
Well-Known Member
I got a blank in 24" finish, but it's only 25" total length. Benchmark said I could start threading right at chamber end to get the 24" finish. This sound plausible?
Cutting 1" Off a Barrel Blank
- Thread starter DoneNOut
- Start date
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Yes, your chamber is more than a inch.
Last 2 rifles I had put together were threaded this way. One was a shilen, the other a Wilson.
DoneNOut
Well-Known Member
Is an inch cut off at muzzle to ensure the bore is good at the muzzle end?
Correct. Some blanks you don't have to, most need some cut off to clean them up.
DoneNOut
Well-Known Member
This is determined by borescope?
Mike Matteson
Well-Known Member
You are not squaring the chamber end to start with?
DoneNOut
Well-Known Member
That was my concern. I figured the chamber end would need cut too
xr650rRider
Well-Known Member
- Joined
- Jun 14, 2006
- Messages
- 45
Your reamer is going to clean up any problem with bore on chamber end. When they lap the barrel it can wallow out the ends. All you need to do is face off the end on the chamber side. After the bore is indicated true.
Mike Matteson
Well-Known Member
The cut on my barrel was 1/4" so there wasn't much cut off. The smith I use cut off 2" on muzzle. So 32" barrels were order out. I when as far as getting 2nd barrels for my 6mm/280AI chamber. Concern about burning up my barrel. That way I could get a second one done before changing out.
DoneNOut
Well-Known Member
This will be a 7-08AI and would like 24" threaded. JGS is still 4 months out on that reamer. Got a 308 WIN "Match Tactical" to use here soon on my Heavy Palma for FTR.
Every barrel manuf is different; McGowen cuts them to length after lapping, so you get what you ordered- no cutoff required.
It's obviously true that the chamber reamer negates the need to cut off the breech end- but there's still considerations IMO depending on the chambering method you use.
If you indicated the throat area (or at least somewhere further into the chamber), then drill/bore before reaming everything behind that area is true to the indicated section. If you indicate the breech end (or set up in the steady), and run in the piloted reamer- you run the risk of selecting an oversize pilot if the very end of the barrel has been belled out from lapping. With this, be sure to select a pilot that's snug fitting further up the breech, and it may be loose at the very end. JMO
It's obviously true that the chamber reamer negates the need to cut off the breech end- but there's still considerations IMO depending on the chambering method you use.
If you indicated the throat area (or at least somewhere further into the chamber), then drill/bore before reaming everything behind that area is true to the indicated section. If you indicate the breech end (or set up in the steady), and run in the piloted reamer- you run the risk of selecting an oversize pilot if the very end of the barrel has been belled out from lapping. With this, be sure to select a pilot that's snug fitting further up the breech, and it may be loose at the very end. JMO
DoneNOut
Well-Known Member
The guy doing this will be me 85%. Going to a 3 day class on how to chamber & cut.
Justice1327
Well-Known Member
I recommend cutting off a quarter inch off on the breach end and saving that piece. It's essentially a coin that has all of your barrel information on it …especially if it goes bad the barrel maker can look at the number. I do this and if I sell a barrel, I give the coin to the buyer.
