What do you consider the freebore?

[dmoran]

No, there's not as long as we all define it differently.

Your first reply to this thread, was a very good answer and directly on topic.
Please don't continue going all "fguffey" on us, with quandary and perplexity dilemma !.!.!
Donovan

 

[retired]

for those of you that think you know that freebore is from case mouth to begining
of rifling just remember this. if you order a reamer with zero freebore, you will still
have aprox .015 transition from end of neck to freebore dia, not zero.

 

[retired]

but your application is just not true.
sammi says "forward of the chamber", while a chamber reamer includes neck transition to bore, freebore and throat.
IMHO freebore is from the end of the neck transition to bore dia to the begining of throat.

because the saami def it says a "cylindrical length of bore" which would mean from the end of the neck transition, not the end of the neck because the transition is not cylindrical.

Most people's definition is that of SAAMI's (below) which is the part of the bore that's free of rifling :

FREE BORE
A cylindrical length of bore in a firearm just forward of the chamber in which rifling is not present. Associated with bullet jump.

Some folks will disagree for numerous reasons.

It's the .2844" diameter .2350" long section in front of the chamber mouth.

 

[Bart B.]

sammi says "forward of the chamber", while a chamber reamer includes neck transition to bore, freebore and throat.
IMHO freebore is from the end of the neck transition to bore dia to the begining of throat.

Very right you are. I was weak in being right. Thanks.

 

[Bart B.]

Your first reply to this thread, was a very good answer and directly on topic.
Please don't continue going all "fguffey" on us, with quandary and perplexity dilemma !.!.!

Are you a forum post content regulator?

 

[MagnumManiac]

Is it this one?

View attachment 1041205

Yes it is, no mention of zero freebore.

Am I missing something that is NOT there.

 

[Bart B.]

Yes it is, no mention of zero freebore.

Am I missing something that is NOT there.

Yes, if you use the SAAMI meaning of freebore. Which I think is prudent referring to a SAAMI chamber drawing showing their specifications.

The 1 degree 26.633 minutes angled down throat (leade) in the drawing starts at the .3150" diameter at the chamber mouth then eventually passes the .3080" groove diameter on its way across the rifling lands to the .3000" bore diameter.

 

[243winxb]

.235"

 

[dcali]

Food for thought: you cannot define the length of the conical section on a reamer. It depends on the barrel’s land geometry. Any useful definitions would be measurable both from the chamber and from the reamer.