needing help with .375

[wmitty]

I'm trying to use the RCBS 37-250-FN by sizing to .370 and patching to .380 and sizing back to .377. I keep tearing patches in the Lee push thru, which I lapped to .377 from .375.

Any ideas on what I'm doing wrong? Am I trying to patch to too large a diameter?

Thanks!

[docone31]

It sounds like you have a rough spot. I can size from .318 to .309 in one pass.
What type of lube are you useing to size?
I found Auto Wax works very well. The die gets rid of the excess. Just a little works well.

[pdawg_shooter]

Are you letting your patches dry before sizing? Are you lubing the patches before sizing? Most any lube will work, but you need something on the patches.

[45 2.1]

The lead in tapers on all the Lee push-thrus are quite rough. You need to polish yours useing a tapered dowell and 300 to 400 grit A/O paper. After polishing the die lube your patched surface and push it through the die.

[wmitty]

I'd been trying to size the patches dry but with no lube. I'll polish the die interior surface and then use some lube on the patches. Hey, thanks guys!

[docone31]

Be tender polishing the interior of the die.
The paper will also smooth out the rough spots.