Hello. Should you buy any 10 round magazines, go with the Browning (MecGar) magazines. You can still find pre-ban Browning HP magazines and should they have witness holes in the rear of the magazine, they are late model mags as with the MkIIIs. These tend to feed.
Keep your eyes open for surplus Ingles magazines that have metal followers. They work, too, in my experience. Sometimes polishing the weapon's feed ramp, especially at the low end helps as does removing the "hump" in older HP feed ramps. Unless you are sure of what you are doing, this job is best reserved for a gunsmith. Best.