My S&W M&P 15-22 likes Federal 525 bulk pak, but will shoot just about everything except CCI Quiet. It feeds and shoots CCI CB Long, but must be cycled manually
My GSG 1911 prefers CCI Stinger (I hope to ween it off the expensive Stingers as it gets broker in)
MY DAR 10-22 with Xtreme barrel (bentz chamber) loves Federal Auto Match, but will run well with Fed 525, CCI Blazer and Remington Subsonics on a good day.
I have a CMMG .22 conversion unit on the way for my RRA AR, I really hope it likes Fed Bulk Pak, as I have 6,300 rounds on hand.