I picked up a SR-22 rifle last week and just got it to the range yesterday. Like an idiot, I forgot the small 10 round magazine that came with the rifle, so I picked up both a Butler Creek 25 and a HC3R 25 round magazine seeing as I planned on doing so anyways. The only ammo the range had at the time was Thunderbolt, so I grabbed a box and went at it. I had constant ejection issues that had me stopping every other shot to clear the jam. It was very frustrating. I figured it was the ammo.
Today I went and picked up 3 different types of .22LR and brought my 10 round mag back to the range along with the 2 other mags. Didn't matter what ammo I used on the 2 aftermarket mags, they had the same issue. However the factory 10 round mag shot everything without any issue. Out of the 300 rounds I fired today with that mag, I had one jam, and I'm pretty sure it was because my grip was loose for that shot. I talked to a guy working at the shop and he mentioned that he had the same issues with the butler creek mags and he took his and loaded them up with 25 rounds and kept them in the safe for a couple weeks. He didn't have any other issues with the mag.
Personally, I'm just glad I found out it was the mags and not my rifle being picky with the ammo. It shot great, tight patterns and was real fun to shoot.