Hi,  I'm currently working on determining the correct case length for my Pedersoli Sharps 45-70. I originally incorrectly measured 2.130 using a cut down & flared 45-90 case.  I ended up with lube on the end of the casing after firing this round.  I then did an lead-impact casting of the chamber. Best I could tell the chamber is 2.140. I cut unfired Starline 45-90 brass to 2.143, neck sized, then expanded the case which gave me the 2.140 I was looking for. Bullet was Saeco 1881 .460, 60 grains 1.5 swiss. Case was not crimped, only the flare was removed. Case mouth was positioned just under top driving band. Slight resistance was felt for the last 1/16" (approx) when chambering the round. Thinking I had hit the beginning of the transition, I was surprised to see lube at the end of the case again, less than with 2.129 but still there. Is the lube ring a sure sign that my cases are still too short or is something else causing this. Leading was reduced for the 2.140 round compared to the 2.130 case. What should the next step be? Should I increase case length a couple of thousandths of an inch each time until the lube ring disappears? 

Thanks, 
-Ed
Musketshooter

Quote:

Factory Reamer Dimensions
Base to neck chamber length on '74 Pedersoli 45-70 Sharps = 2.1290"
Throat = 0.5253 consisting of freebore = 0.3333 and leade = 0.1920
I reload COL so the bullet nose just touches the leading bore cut and have used cases down to 2.095.  When they reach this length, I stretch them back to SAMMI length

And as Terry said - not an issue