Yes they are supposed to be different but I have an internal 300WM and 30-06 mags and I cant tell any difference in the magazine itself, but there is a difference in the follower.
What you just described is IMO 90% of the reason the stagger feed magnums were control feed, and why the new rifles are all now centerfeed.
I never had much luck getting a staggerfeed push feed to feed magnums reliably. I tried a few times and gave up. Already had a control feed anyway so I did not waste much time on a push feed conversion.
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