Leading in the cylinder throat?

[Joe C]

Decided to dig out a revolver i hadn't been shooting in years.

It is an old model 10 i had built up as a PPC style gun 20 years or so ago.

I seem to be getting quite a bit of leading in the cylinder throats , actual flakes of lead .

It seems to brush out pretty easy , but i am getting it after only about 30-50 rounds or so .

I was using 2.7 gr Bullseye with both a Star HB WC bullet and also a ???? 148 gr double ended cast wadcutter.

The Star bullet measures around . 3575' , the double ended bullet .358"

The cylinder throats are , near as i can tell .3575"

The take a .357 plug gauge , but won't take a .358 gauge .

The Star HBWC , at .3575 just pushed thru the cylinder throat , the .358 bullet won't easily pust thru.

I am not getting any noticeable leading in the barrel , just the cylinder throat.

any suggestions.


thanks

Joe

[MtGun44]

How rough are the throats? I'd bump the load up a hair and see if it helps, may
not be fully filling the throats at very low pressure. See if 3.0 or 3.2 helps.

Bill

[2 dogs]

Im wondering if that particular lot of bullets is too soft? Sounds like your gun is correct dimensionally.