Where to start?

[BOB LEE SWAGGER]

Ok, you have settled on a new to you caliber and want to do it right. You want your own reamer so the chamber is exactly what you want. You also want the reamer to get a custom seater and neck/body die. You have the brass and intended bullet. How to you seat the bullet in the case to make up a dummy round? Or do you go with the excellent advice on this forum and get the reamer close by agreement and then have it made and proceed?

Thanks in advance!

 

[madderg]

If you have something in mind, call JGS and talk over the different aspects. They a full of info and area great help in the finished product.

 

[CJ6]

You,your reamer maker and Smith need to be as one. So everyone is on the same page.

 

[P1ZombieKiller]

You,your reamer maker and Smith need to be as one. So everyone is on the same page.

+1

 

[LHSmith]

You also want the reamer to get a custom seater and neck/body die.

Not what I would advise. I prefer a FLS die made with a resize reamer that corresponds to the chamber finish reamer.

 

[Phil]

You want to keep the boat tail out of the neck / shoulder junction, to avoid any doughnuts, as well as keep case capacity at a maximum.

As to dies, you can use your chamber reamer to cut a Wilson seating die, and get a second reamer cut smaller so you can cut a Newlon Precision full length sizer / neck bushing die.

Of course if your going a little more main stream the second die may not be necessary.....


Phil.

 

[Toby Bradshaw]

It's a chicken-and-egg problem. Buy (or borrow) a seater die to make up the dummy round to send to the reamer maker. You can always sell (or return) the seater die if you decide to have a custom seater made with your chambering reamer.

You can also just send the reamer maker an empty case and 2 or 3 of the bullets you want to shoot, and the reamer maker can figure out the freebore dimension to keep the base/heel of the bullet above the neck-shoulder junction.

 

[spclark]

Reamer design: talk to the folks who make 'em. They've been doing it for a long time, probably already done something close (enough) so aware of potential problems.

Sizing / seating dies: once your chamber reamer's cut a chamber, fire three or four cases without sizing then send those to somebody who makes custom dies. Cutting sizers with chamber reamers isn't a good thing for most applications; sizing dies need ever so slightly different dimensions owing to how brass behaves.

You'll save yourself time, money and frustration by finding folks who know what's been done wrong before on projects most likely similar in nature to what you're looking to achieve.

 

[BOB LEE SWAGGER]

Thanks guys. Really helpful!

 

[dmoran]

You also want the reamer to get a custom seater and neck/body die.

Seating and Neck dies dimensionally need to be a match or near match of the chamber, to support the case. Reamed with the chamber reamer for an exact match, is a very good way to make them.
.
Sizing dies (F/L, Body, Bump, etc..) need to be dimensionally smaller then the chamber, to re-size the case to clearance. They are made with undersized Die reamers and then they are hardened.

Donovan