A few years ago, Charles Petty, I believe, did an article on brass. He had a .45 barrel, set up in a special clamp, to eliminate any variable on a standard .45 auto. He mixed brass, but used the same bullet and powder combo. At 25 yds, there wasn't a hill of beans differance in group size.
Now I know there is a major differance if your shooting at longer distance's. As long as you segragate your brass, and use good reloading procedures, any brass should give you many,many reloads.
On my straight wall pistol, I use Lyman M die for belling,(I cast my own bullets, and these dies work great for that), and Redding Profile crimp dies for that. I had one lot of .357 brass,(Federal) that went thru 20 reloads, befors the case neck started to split. And a lot of .44mag., 13 loadings, before they went bad.
And just to throw this out at you guys, don't just throw away your old brass, or leave it on the ground at the range, just because it's dirty, and someone else shot it. Scrap price's are almost $3 a lb. here in Ohio. A 5 gallon bucket can bring you over $150 now. Check your local scrap yard, as some of them get touchy if they think there might be live ammo, or cases with live primers in them. But it's worth the effort to pick it up.-Gypsyman