Author Topic: CHAMBER REAMER (Read 583 times)

JCP · « **on:** October 18, 2003, 07:11:34 AM »

I am in the process of building a 45/70 on a no. 5 rolling block action and would like to be able to shoot heavy bullets like the 530 gr postell. My question is, are there reamers with different throat lengths. If so, what reamer does anyone recommend.

onesonek · « **Reply #1 on:** October 18, 2003, 03:24:24 PM »

I can't speak for all, but in my experience, chambers are cut. And then throated to desired length after. As for recomendation of a maker, I can't. My uncle use to make his own. And my current smith's haven't told me, but I haven't asked. Although, I guess when someone mentions reamers, Clymer comes to mind. But they aren't the only ones available. You might check out the gunsmithing board.

John Traveler · « **Reply #2 on:** October 18, 2003, 06:06:30 PM »

ONESONEK is correct...

The standard SAAMI .45-70 chamber has practically no throat or lead to it. Adding a long throat or lead is done using a separate throating reamer after the chamber is cut.

As for what is a good brand to use... there are many.

Clymer in Michican enjoys an excellent reputation, as does JGS on the west coast. Even little-known brands can be good.

What constitutes a "good" reamer is simply careful workmanship, execution of design, heat treat, and materials. Satisfied users spread the word, and the good reputation is built.

John

Rick Crabtree · « **Reply #3 on:** October 19, 2003, 09:16:54 AM »

Check the bore diameter on your barrel probably won't need to throat the chamber. Most postels are around .449 on the bore bearing part on the nose in fornt of the driving band. I shoot postels from my Steve Brooks mould in one of my Sharps that has NO throat at all. On days when I do my part it shoots sub moa groups with black powder at distances to 500 meters.
Should you NEED to throat the barrel you can get a throating reamer from Brownell's.