Southj;
OAL is good, so not concerned with the bullet head dragging the inside front of the magazine.
Just an FYI, keep the COL below 1.170" or rubbing may occur.
Case OD at .375" is about the norm.
If you have a .378" crimp, then you have no crimp at all, but a .003" bell at the case mouth which may cause an issue.
I roll crimp mine to .369"-.370".
Make sure the magazine follower runs very smooth up and down.
The magazine bodies can be easily squeezed causing the barrel that rides in the follower groove to bind.
With the magazine spring removed, install just the follower and barrel, it should move from top to bottom under its own weight when you tip it up and down.
I have replaced all my magazine springs with Wolff, not because I ever had an issue with them, but for piece of mind.(still have all of my original springs in a bag around here).
And yes, the floor plates on a couple of mine are a bear to remove but can be done.
Just a note, you may just want to take the magazines apart and clean real well.
Also tighten your crimp, may cause a better burn of powder and slide movement when firing.
The M52 can be finicky but once you work the little bugs out, it will be flawless and a real pleasure to shoot.
Let us know and good luck;
Clarence