I have only tried the CCI400 and they work great for me. I did not need to try anything else. 1 to 1 1/2 inch groups at 100 yards. Works for me.
I just picked up a 25 ACP conversion but I have not tried it yet. I too will be using CCI400 as I have about 500 of them.
What powder are you using? If 777 did it help with the "Crud Ring"? I like the way 777 shoots, but loading a second shot becomes a challange, and the third is impossible without swabbing the bore.
Our late M/L season ends here next Wednesday. After that I'll have time to expiriment. This year I bought a pound of American Pioneer Powder. Using Win 209 primer and a 235gr. QT40 I had pretty good results. I really don't want to give up on 777 yet. I'm hoping the 25 ACP conversion helps eliminate the 777 issues.
Thanks