Alabama Red,
Need more info on your AS Spencer, which I assume is an Armi Sport Spencer. New, or used? Ooops, just read your other post
There is a screw (a safety feature for guns coming from Europe to the USA) in the magazine which only allows for the correct loading of 5 cartridges. As for the magazine capacity, for some reason some Armisport Spencers have a rod screwed into the base of the follower to limit it to 5 rounds! Only takes a minute to remove the follower screw and screw out the rod. If you remove the screw then 7 56-50 cartridges can be loaded with the magazine spring having the correct tension and this might haelp to improve your loading.
If this is not your problem, please go to the SORI Thread and scroll down to the section dealing with feeding problems for the Armi Sport Spencers, and see if any of those suggestions will help.
Two Flints