P1 wrote on May 29^th, 2018 at 3:55pm:

   For sure! 

Yes I have pin gages and collets. My tube mic shows brass to be close to round but having thick places that I would like to skim off. Taking off a full .001 or more will have my brass on the thin side of where I want to be.

Quote:

.0005 looks like 5 ten-thousandths to me.    

Kkid, is this for fixed or breech seated shooting?
While we have some disagreement on whether or not it's all that important to breech seating, I don't think that a half thou would be much to sweat out. Is the damn gun even within a half thou?
Not against you doing it, just wondering why you feel that small amount is worth eliminating. Carry on.

kkid66 wrote on May 29^th, 2018 at 6:28pm:


OK, here is what to do:

1. Chuck the body and turn the rim, to true it up.

2. Size the neck, using a mandrel on the inside of the neck.

3. Find a pin gauge that is a light push fit in the neck. It must be a push fit. If your pins are to big or small for that, make a mandrel  that fits a pin.

3. Chuck the pin in a good drill chuck or collect, in your tail stock. Of course, check the pin for straightness and the tail stock, to be on center.

4. Chuck the rim in the collect.

5. Oil the pin the pin or use a good sizing wax, like Imperial or Hornaday.

6. Don't run it at more than 500 rpm, slower if it gets warm.

Frank

Frank, Thank you. I may have run my lathe too fast last time.
Flyer, This is starline brass fixed ammo for Creedmoor 1000yd in 45-70. Brass is weighed and base matched by shell holder and feeler gauge for base thickness. My neck tension runs just under .001.

J Luis, If I were going to try a neck turned case in your application, I would start with 30-30 cases and neck down.

The reason is necking up stretches the brass where necking down will condense it. With a thicker neck, it could be turned to better fit your chamber, possibly giving you a a more precise fit. That will depend on thickness.

One thing is for sure, turning what you have will increase that clearance.

I may have some 30-30 around here, if I do, I will neck them down and see how thick they are.

What is your bullet diameter? or neck diameter &  thickness