Reaming a chamber?

[5.7 MAN]

Hope this is the right spot for this!

I picked up a Pedersoli sharps in a trade awhile back and I have just started shooting it. It has a 34" octagon to round barrel and left the factory as a 50-70. The previous owner reamed the chamber to 50-90. the chamber is very tight up by the throat and it is very difficult to get a round to go all the way into the chamber. I have used bullets as cast and sized to .512, none will fit without running them back into the full length sizing die with the decapping pin removed after being loaded. I imagine that this is not coducive to accuracy. It's not, I cannot get it to group better that 6-8 " at 200yds.

There is a visible narrowing/ridge in the chamber near the throat and I believe that whoever reamed the chamber did not quite finish the job.

I am thinking about renting a reamer and trying to correct this issue, having never done this: Is reaming a chamber as simple as it appears to be?

I would like to try the reamer first and then will consider rebarreling as a next step, however I would have a gunsmith perform that task.

Thanks, Dan

[nanuk]

sounds like the longer reamer didn't clean up the end of the original chamber

is the ring to one side or all the way around?

[leftiye]

The part of the chamber that you are talking about would be the case neck area? You may be able (should be) to relieve this by hand with a chucking reamer. So long as things are straight to begin with, it should remain so.

Nanuk's comment about the mini shoulder may well have resulted from the 50-90 reamer just being tight (= too small) as you have mentioned. Depending whether you want to go that large at all, it may clean up when you open the neck up. Reduced at any rate.

[scb]

It sounds to me like a 50-90 roughing reamer was used and the finish reamer operation was forgotten or skipped. Or for some reason the person who did or had this done wanted a tight neck. Have you "slugged" the barrel? Perhaps your .512 boolits are too big. Any reamer inserted into a chamber should be piloted. A chucking reamer is a real good way to "bubba" the barrel.