Bullets or the mags. I have had a terrible time with my 10/22. I have a hammerforged target model. The gun hates Remington Golds and actually shaves of the bottom side of the bullet as it feeds. The gun loves the Thunderbolts. Match grade works the best, but I don't like paying for it. I have had a problem with magazine. Only the metal lipped mags work in my gun. The "hotlips" will not feed. I require only Butler Creek metal lips too. I bought two 25 rounders (advertised on Gunbroker as Butler Creeks) that were unmarked off brand mags. These would only feed for 1-5 rounds before jamming issues occurred. If it is jamming with the factory 10 rounder with superior ammo then you have a problem with the gun.
The strongest reason for the people to retain the right to bear arms is, as a last resort, to protect themselves against tyranny in government. -Thomas Jefferson