Wilson mags have wadcutter lips and do well on many type bullets but not as well on others.
Same for semi-wadcutter lips (Colt mags now have these)
Then there are hardball lips, the original GI feed lip geometry. This design work better than the other 2 on GI hardball rounds, but not well with hollowpoints or wadcutter bullets.
I like the real USGI mags as I never shoot anything other than hardball and have had Wilsons choke on them.