This has become a topic of considerable discussion. A shooter's opinion of it depends partly on his/her use, and the expectation of a certain level of accuracy. After owning and shooting over 20 mag fed PCP rifles, and assuming one has an expectation of precision accuracy, I can offer this experience. The only air rifle I have shot which performed as well with the mag as without, was a Taipan Veteran. It's magazine has no spring actuation, and it functions almost as a rotating s/s loading tray. I would guess that 80-90% of all magazine rifles shoot well enough from the mag to satisfy their owners' uses. I've had only a couple that shot downright poorly from the mag. And, I can't be sure if the problem with them was the magazine itself, or the actuation system of the rifle, as either could contribute to a problem. But I would never shoot in any competitive environment with a magazine, why introduce a variable that can only be potentially negative? If I shoot 10 groups each, with and without the magazine, with any of my rifles, the single shot groups are always better. Some folks would see the groups and say, "that's not a lot of difference". No, but what's the difference between a 9 and 10 ring? Any measurable difference will put you out of a ring. And my worst offenders could put you out 3 rings!
