Topic: Does using a neck reamer improve accuracy

[fastfire]

I've been neck turning my cases, would it improve accuracy to also ream the necks or maybe just the use reamer?

[fj40mojo]

Accuracy is all about controlling as many variables as possible. If that's whatcha gotta do to maintain optimum control of bullet tension and release then it will make a difference. The real question is will the difference be measurable?

[fastfire]

Neck reaming should be done on a fired unsized case?

[44magnut]

For me, the big gain was turning the necks. Reamers made no difference with neck turning.

 Hope that helps

[J Mack]

Outside neck turning is what works for me to remove the donut from my necked down brass and in my opinion a better way to achieve uniform neck thickness.


I have a .295” throat and use a .264” bullet and my best consistency is with .0130” to .0135” neck thickness. You can feel just a slight bit of drag when you insert a new bullet in a fired brass and it has that nice consistent feel like two machined parts through the entire range of motion, its important that the bullet slides evenly all the way into the case and doesn’t stop  at the neck shoulder junction.
If your throat is large enough that your bullet will just drop into a fired case then I would only remove enough material to uniform neck thickness but wouldn’t expect  large gains in accuracy.

[ballardw]

If my memory isn't going to badly, the main reason to ream necks is when forming brass. You're moving lot's more metal around and sometimes even significantly moving shoulders forward or back. This is quite likely to have some of that metal move unevenly and reaming gets the inside diameter back to nominal for the new caliber for the entire length of the neck.

Then turn the outside to true up chamber fit and help tension.