A device and related method are disclosed for efficient loading of a spring powered magazine. The magazine body is configured with equal and opposite lateral channels extending from the magazine floor to near the magazine top. The channels are located approximately at a longitudinal midpoint of the magazine body. The follower of the magazine is configured with a follower sleeve having a longitudinal dimension approximately equal to the longitudinal dimension of the opposite lateral channels and aligned with the opposite lateral channels as the follower slidably travels along a vertical axis of the magazine body. As the follower sleeve aligns with the opposite lateral channels, it is configured to be engaged by a compression tool to relieve, as the compression tool acts upon the follower, spring tension between the latest round loaded and the retainer lips of the magazine opening.