If it's a choice between 8x57JR and 8x57R-360, it looks to me like the rims are significantly different sizes. I figure I'll just measure the rim recess, order my brass based on that, and then fire one with a light fire-forming load and no bullet (assuming I have a shell holder the right size to prime it), to make sure the chamber is really what we think it is. I figure it will be, but just in case........

Edit: Yeah, what Der Ami said! I should read all the posts before replying..........

Thanks for the advice on the load-all! smile

Now for the worst part: Waiting on the gun to arrive! Haha.

Last edited by Mr. Polecat; 06/10/19 01:03 PM.