6mm BR fired case growth?

[TRECustom]

I just test-fired a new chamber (no turn neck). The overall unfired case length was 1.555", the neck was .268" diameter with a Smkhp seated, the shoulder was .458" dia, and the web 1/8" in front of the extraction groove was .467" dia.

The corresponding fired case dimensions were 1.555", .270", .460", and .469". The case extracted smoothly, and will rechamber in 4 headstamp orientations 90 degrees apart. The 205M primer is moderately flattened.

The headspace is pretty tight. The bolt won't rotate on a go-gage, but will close smoothly on an unfired Lapua hull, and on a Lapua case loaded with a 70gr Smkhp (the test load).

This is new territory for me, and I would like to know if these are acceptable dimensions for a 6 BR.

Thanks, Tom

 

[RMiller]

Looks normal. Only grew .002 anywhere. Load them and shoot them.

 

[TRECustom]

Ryan, I've paid a lot more attention to this rifle because of the reputation the 6 BR has for accuracy, and I don't want the rifle to be the weak link. I was concerned that the chamber itself might be too loose for best accuracy.

I'll take your advice and see how it shoots.

Thanks, Tom

 

[RMiller]

No, that chamber isnt to loose. Its about as good as it gets.

If you have good dies your good to go.