Datum Dial Aperture for 6mm ARC?

[FOHA1]

Search turned up nothing, so...

Using the Forster Datum Dial kit to set shoulder bump, I use it wit good results in 6.5CM, 6GT and .223, but the Forster site doesn't list 6mm ARC on their website. 6mm ARC has a 30* shoulder angle as does 6mm XC and they recommend the .375 aperture, but 6.5 Grendel also has a 30* shoulder angle and they recommend the .350 aperture. Don't know it it really makes that much difference, but just want to do it right.

So .350 or .375

TIA

 

[FOHA1]

And the answer is .350.

 

[B y r o n]

FOHA1 is correct. If you can't find a list with the cartridge you're looking for go to SAAMI and pull up the case drawing. The number you're looking for is the same used to set headspace. It's the line between the start of the shoulder and the end of the shoulder where the neck starts.

 

[r.tenorio671]

HYG, .350 is the number you're looking for..