Resizing 243 Win brass issues

Try Redding Bio Green lube. I’ve used just about everything you can name and so far I haven’t seen anything that comes close. It’ll take a hard sizing or reforming job and make it into the easiest thing you ever saw.

Lubing sparingly is for when things are going right, not for when you can’t even case in the die.
 
Made up lots of 257 cases from 270 cases, using Rock Chucker that is old, and RCBS dies, Imperial Sizing Wax and then trim cases to length and never ever stuck a case doing so, that was when 257 ammo was hard to find, They all fit the chamber and went bang, same thing necking down 30-06 brass down to 25-06.
 
I haven’t read all the replies so disregard if it’s been resolved.

First, I’d get some other dies. I love my bonanza / Forster FL dies. If that doesn’t work, then try trimming it. How long is the brass? I’ve had once fired brass that was over “max case length”. And obviously proper lube. But if you reload other rounds without that issue I would imagine that lube is not the issue.
 
I have a number of Lyman dies - in what way did you find them to be "so far off, not even usable" - what dimension - diameter, length??

I've had one bad set of Lyman dies. I couldn't get bullets seated without excessive run out. I bought them used at a gun show and suspect that's why they were there at a good price.

I sent the the sizer die back to Lyman and they replaced it with a whole set of dies, along with a note to toss everything from the original set.

I kept the seating die, it was fine, true to its axis.
 
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