It should be a simple matter of putting a wide rubber band (like cut from a small inner tube) to keep pre-loaded pellets from falling out the bottom while in your pocket.
The magazine does in fact drop easily into the receiver that's mounted to the gun. There is a detent in the magazine and designed in the receiver is a spring loaded feature that nicely captures the magazine to keep it from falling out during the rigors of hunting.Certainly a user could use a rubber band or a small piece of tape to keep pellets in the detachable magazine (s) upon removing the tape or band the user would not wish to tip the magazine lest he spill the contents of the mag. This means he would have to tip the gun on its side and bring the gun to the magazine. Not a big deal to do it that way if you really want additional full magazines. After shooting a lot of pellets out of this magazine I find it very easy to drop 6 or 10 pellets down the chute after the mag is snapped into the receiver.