I tested various brands of ammo out in my Marlin Model 60 and here is what I found: CCI Mini-Mag HP: Very reliable but not very accurate. Would make a good plinking ammo or squirrel hunting ammo. CCI Velocitor: Very powerful, fairly accurate, and reliable. These would probably make a good round for groundhogs, etc. CCI Stinger: Not very accurate (on par with Mini-Mag HP) but they would be great for small game. If you hit your target you will get good results. I found they were reliable also. Remington Target (blue and green box): Extremely accurate. This would be a great target shooting round. It produced one ragged hole after 5 rounds at 50 yards. Reliable too. Remington Thunderbolt: Very cheap, and fairly accurate. I didn't experience any reliability problems either. Good plinking round. Federal Value Pack 550 Rounds: Fairly reliable and very cheap. I experienced one dud out of the hundreds of rounds I fired. Surprisingly these rounds were pretty accurate. So far I think these would be great for plinking. Remington Subsonic: These rounds were fairly accurate and I experienced no reliability problems. They fed through my gun fine despite be subsonic. They were more quiet than most rounds. They are a little dirty compared to the other rounds. CCI CB Long: I haven't tested them for accuracy yet, just plinking. They don't feed in my gun but they are the quietest rounds I have seen so far. I highly recommend them for low-noise shooting but they are pretty much useless for anything else. I will most likely shoot the Remington Target at paper and the Federal Bulk for plinking.