6-284 vs 6mm Rem AI

[Blue Avenger]

Has anyone fire formed 257 Roberts bass for the 6mm AI?
NO, why? is it better for any reason over the 6mm brass?

[Blue Avenger]

OK
Looked it up. And basically the 257 is the same dia, just longer at all shoulder points, so the 6AI die would be making new base to shoulder lengths. See where it might work.

[BWB]

I've heard the 257 Roberts brass will last longer, just wondering if anyone has tried it. My plan is to start with the 257 Roberts brass since I'm buying new anyway.

[Torg]

Good dope on the 6AI.
http://www.richardscustomrifles.com/index.html

[Ray Gunter]

I've heard the 257 Roberts brass will last longer, just wondering if anyone has tried it. My plan is to start with the 257 Roberts brass since I'm buying new anyway.


Yes I am using 257 brass for my 6mmRemAI.
I didn't have any 6mm and not any good brass in 7x57.
So I used 257 and created a good tight false shoulder to fireform against.

[gotcha]

Adam 330, Yes, the 6mm rem. LCD will size both 6mm rem & 6mm AI...... I have a 6mm AI & a .257AI......... Use rem parent brass for both & see no advantage in using .257 rbts brass for 6AI. Was warned NOT to use 7X57 brass for my .257AI by Dave Kiff. He shoots the .257 AI & got donuts w/ 7X57 Norma brass. Don't know if 7X57 brass would cause same problem w/ 6mm AI but why take the chance ???