Can someone tell me the neck diameter for for micron 6BRA arbor seater
Hi Flamingapple,
All of the micron dies open up at the shoulder. This means there is no relevant measurement for the neck.
The diameter of the neck area would be relevant to me, how close the tolerance is between the bullet seated neck diameter of the cartridge and the diameter of that area of the die.
I must not be clear of what I’m looking for.
I understand what you are asking, but I suspect the information is proprietary from one manufacturer to the next. The brass thickness at the neck varies between manufacturers. I have found Lapua brass to be slightly thicker at the neck then Norma. At least for my Sako 22 PPC varmint rifle - factory gun with factory barrel, but Lapua brass would not chamber until the necks were turned. Die manufacturers have to allow for these differences. If Micron won’t tell you, I guess you have to try to measure it yourself. If you think it’s that important to you.
Thanks for your input. I agree with what you are saying. I’m chasing runout and the last step is seating the bullet. The tighter the fit the less chance for crooked ammo. Until it binds and wedges. A friend got his Micron seater today so we will show it performs.
Thanks again for your comment.
For the best possible results it would be best to have a custom die made . Of course that would be a little expensive . It would also pin you to a certain Bullet , Brass and if you turn or don’t turn your necks . All that will have to be established . But if you’re after the ultimate results that would be the road to go down . A .001 would be the target . As far as chasing runout , I assume you checked your brass after sizing ? after mandrel ? Then of course after bullet seating . The causes can be many at those stages . Some examples , Bushing dies can cause run out . Mandrel can cause run out if the neck has been sized too small ( standard dies ) . I’ve gotten better results with FL custom honed neck dies than bushing dies . Then mandrel only sizes .001 or so reducing runout . You probably checked all of this and if so I apologies . Good lube and the right amount are important as well as a good chamfer . Good luck and happy reloading