Now what to do...

[Don McDowell]

Fella on another board got ahold of some 1.5 OE, and in one of his 45-90's 81 grs cut his group size in half and 78 grs in his other rifle is shooting small groups like that rifle has never shot before. Both those were with a lyman postel cast from 20-1.

[Don McDowell]

Reamer and mould got here today. The mould does not look to have ever been used, it only has the flat base plug..
The reamer as near as I can measure it is .473 at the case mouth, the angle is considerably flatter than 45 degree. It is the floating pilot and that measures at .450.

[bobw]

Don will that tight reamer clean up the original chamber completely? bobw

[Don McDowell]

Considering the reamer is 2.4 and the chambers are 2.1,, pretty good chance it will be ok.

[Gunlaker]

Don, do you have a reamer print with it? Assuming it's the one I think it is, I can send you a copy if it's of use to you.

Chris.

[Don McDowell]

Chris, there's no print with it. Don't really think it's necessary. But thanks for the offer.
Just need to decided whether to modify something laying around here already, or to rebarrel something, or.....

[Iron Coyote]

Don
If I may make a suggestion,a chamber cast of the existing chamber & very carefull measurements.
I recently picked up a Pedersoli rolling block barreled action that was sold as a 45/90.
It turned out to be a 45/70 that some one tried to rechamber to 45/90.
There is now a fairly deep ring where the old chamber ended. In this particular chamber the 2.4" reamer did not clean up the old chamber.
The new chamber is cut for gg bullets.
Thnx Lot
Bob

[Gunlaker]

One thing to be careful of is that Dan's reamer has a cylindrical section of I think 0.3" at .474" so it might not clean up a standard .45-70 chamber without setting the barrel back.

Chris.

[Kurt]

Running a .474" reamer into a standard .481-2" chamber neck you will end up with a .0085" bump like if you run that case neck 1/8" into a .474" bushing die. I don't see anything good with the base of the bullet and the wads in the larger neck portion getting swaged down 8 thousands when the charge goes off.
You would be better off using a throating reamer made for the standard chamber. With that reamer you can make your 2.1 or what ever it is to 2.4 or 3-1/4 if you want and have a clean chamber.

[Kurt]

I should have said; a standard Shiloh chamber is .481" at the case neck and the Shiloh chamber is usually tighter then most others.