In regard to bore diameter and Jackie's test

[dreever]

Here's a question that keeps coming up. In a 6MM fast twist barrel do you go with a .236 or a .237 bore for the heavier bullets?

Krieger's position is that a .236 bore is needed to help with the spin of the bullet.

Others feel a .236 engraves the jacket too much and spec a .237 bore.

So who's right and who's wrong and what do most of the top shooters spec in regard to bore diameter?

What's the barrel for Jackie's test measure?

 

[Forum Boss]

The test barrel is a .237" at Jackie's request.

When I asked Krieger about it, they said they didn't have a strong opinion one way or the other.

 

[chuckw2]

I just bought a 6mm barrel from Broughton. I dos not say what the ID is.
The invoice states: 243 Cal 8 twist 5c groove
416R S.S. Broughton Rifle Barrel Blank
1.25 X 32 with a 7.97 Contour
.2432 X .2732
S/N 3611


What does .2432 X .2732 signify?

Chuck

 

[jb1000br]

Chuck -- those ARE your bore dimensions!

Mine is similar IIRC... about .2372 bore

JB

 

[chuckw2]

Gunamonth,
I rechecked the invoice.
Edited #'s .2432 X .2732, Is something wrong with these figures?




Chuck

 

[ArtinNC]

My Broughton barrel invoice has .2432 X .2370 .And 1.065 x 30 with a straight contour, for Savage ). and shoots very well and cleans very easy. Art

 

[jb1000br]

Gun and Chuck -- sounds like a typo...call Aloma

JB

 

[chuckw2]

Gunamonth....You are NOT a pain at all, I am very curious about this myself. Broughton bbls were well represented at all of the long range prone shoots I shot last year. Five of my buddies have switched from Krigers to Broughtons They are shooting lights out with them.


...........Still I am going to give Tim North a call.


PS. There is an article about Broughton in this months Precision Shooting.

PPS Broughton closed this week.