Cutting off the inch

[Steve Ladino]

I understand the reasoning behind cutting off the end of the muzzle but do you all cut off a full inch?

 

[tclaunch]

I take off 1 1/2"

 

[Danny1788]

If I have a 27" blank and I want to finish at 26" I take 1/2" off the breech and the muzzle. Otherwise I normally take more than that. I cant tell you if it makes a difference, But that's how I did it on the cheaper barrels Ive bought that only come in 27" blanks like Green mountain.

 

[Ggmac]

I slug it and let the barrel tell me .

 

[JohnKielly]

I've always figured that the manufacturers give me good information, and as they either mark that inch or say to knock an inch off, I reckon that they're giving me the good information. I really couldn't live with a coned muzzle.

 

[watercam]

Since the breach is going to be threaded and chambered, why bother taking a 1/2" off that end? You will be digging in over 2" with a chamber in any event.

 

[Ggmac]

Usually to recut your center

 

[hoz53]

Usually to recut your center

I was thinking like Watercam--why cut off the breech when you're going to ream it anyway-but recutting the center does make sense although prob wouldn't need 1/2"-also I was thinking if a guy is really anal you might not want the loose area of the bore allowing you're reamer pilot to runout some in that short distance if you chamber that way.

 

[hoz53]

I like to cut 1" off the breach to give me good indicating bore. At least 1" on the muzzle, and I would prefer closer to 2" The cone can be measured if you indicate directly off the bore and its actually pretty bad. I order 31" blanks to make 28" barrels.

Good Info Thanks--Ok I hope im not hijacking this thread-- Do you bore/drill or run a finish reamer in all the way, I forget? I remember your comments about using the core drills. I am trying to figure out if I can bore and still have the reamer pilot in the bore all the time. If a person does bore youre cutting out the coned section at the breech right? I guess Ill have to get one of those long stylus interapids.

 

[Steve Ladino]

Good variety of methods and support of them....Thanks

 

[Danny1788]

I do drill on the loarger cases that I dont have a core drill for. If the case is too long you can drill and inch and ream then drill another inch and ream, then you keep the bushing in the bore.

Alex when you chamber a 28 nosler with a core drill first what is your procedure for a long fat case like that? Do you cut an inch then ream the drilled hole, then drill another inch and ream again? OR do you drill short of the shoulder and let the reamer fallow the drilled hole since the hole was drilled with a piloted drill bit? Also what size core drills do you use?

 

[hoz53]

I do drill on the loarger cases that I dont have a core drill for. If the case is too long you can drill and inch and ream then drill another inch and ream, then you keep the bushing in the bore.

Ok Thanks Good Info.

 

[JohnKielly]

Know I posted already but it just hit me that the manufacturer wouldn't have hung that extra inch on the barrel blank over the length you ordered if he expected you to use it.

 

[Danny1788]

Core drills are piloted and have the correct shoulder and body taper. I will run them in .2" short and finish with the reamer. I find this to give better than .0002" runout at the rear of the chamber and enough cutting with the reamer to ensure reamer sized chambers. If I dont have a core drill I will start with the reamer then use a regular drill to remove an inch, then catch up with the reamer, drill some more, exc. No matter how its done, if you end up with a chamber that has .0002" runout or less and measures what the reamer does, you are doing it right.

When you ordered ur core drill from PTG did you order it specifically for the reamer you were using? I didn't see that as an option? They just listed them as .500" piloted core drills. That's wat I bought as it would be undersized for the rums and 28nosler cases.

 

[Alex Wheeler]

When you ordered ur core drill from PTG did you order it specifically for the reamer you were using? I didn't see that as an option? They just listed them as .500" piloted core drills. That's wat I bought as it would be undersized for the rums and 28nosler cases.

I called JGS and ordered a drill for the 28 nosler.

 

[Rustystud]

Better rifle Barrels are choked the last 8-10 inches. This is done by lapping the bore. The lap is not completely removed from the muzzle. This is the main reason the last inch to inch and half are cut off. The other end is removed when chambering.
Nat Lambeth

 

[Steve Ladino]

Better rifle Barrels are choked the last 8-10 inches. This is done by lapping the bore. The lap is not completely removed from the muzzle. This is the main reason the last inch to inch and half are cut off. The other end is removed when chambering.
Nat Lambeth[/QUOTE
I was told that choking was a common misconception by a top maker and I was told also that it is sought after in manufacturing by another top barrel manufacturer over the telephone. Proof is on the target and likely the performance crosses over from choked to unchoked.