Oversized barrel?

[Alex Wheeler]

I just cut the throat in a 5r 30 cal barrel from Benchmark. The bushing size was a .3006" which is the largest I had. I can still see the lands in the freebore section, the reamer did not cut to the bottom of the grooves. The reamer does measure .3086". Anyone else run into this?

 

[ridgeway]

Are you using a throating reamer? UNI throater? Maybe the reamer freebore diameter is not what its marked?

 

[Alex Wheeler]

Its a regular chamber reamer and it measures .3086 in the freebore section. The reamer did not do this in a Krieger 4 groove.

 

[Dusty Stevens]

Even a beautifully machined barrel can be bad even tho its hard to admit sometimes. If its oversized it may just need to be called bad. Benchmark seems like a very straight company you may want to give em a call and see how they feel about it

 

[ridgeway]

What is the bore size on the benchmark supposed to be? Isn't common bore diameters run .306-.308? Is the lands faint or pretty pronounced? Call them like Dusty said. With a FB diameter of .3086, I would think it would wipe them out.

 

[STS]

If you have the ability to do so, I would suggest slugging the barrel. It will eliminate any guess work regarding the dimensions of the barrel.

 

[Alex Wheeler]

Well, since this was a personal barrel I did take take it out and shoot it. So far there are no fouling issues and it looks like it will shoot. I was just curious if others have seen this or if it is common. I may give them a call on it, but at the moment I see no reason to replace it.