My barrel is .260 and I have a bullet sizing die from C&H, it does shoot .257 bullets well as seen but I'm a little afraid of gas cutting the throat on an irreplaceable barrel using undersized bullets. I size down 85 gr Sierra's and 90gr Speers .264 bullets for it.

Making cases from 9.3x72R

6.5(.260)x58R Sauer from 9.3x72R. Not really readily available intermediate dies so I do it in just the 6.5 FL die. Trim to near correct length, anneal and multiple sizing increments, when it gets tough re-anneal. Going slow prevents any wrinkles.

6.5x58R Sauer center, 9.3x72R right, 243 for reference right
[Linked Image from imagizer.imageshack.com]

My chamber is very generous so no reaming needed

Sorry I've been coyote hunting and didn't see this right away.

I tried the Bertram brass and it is very thin and brittle, I have to anneal it befor the first firing.

Here's another source, I haven't tried them or have any experience doing business with them but came across this the other day.

https://www.ammunitionartifacts.com/metriccartridgecases/65x58-rimmed-sauer

Last edited by oskar; 02/13/21 09:55 AM.
After the first shot the rest are just noise.