Looking at your photos, I can see that the tips of the rounds are hitting the front of the magazine.
When you load your magazines, the rounds should be loaded so they are in contact with the rear of the magazine. This should put the tips clear of the front of the magazine when feeding, and there should not be scrape marks on the front of the magazine.
If the rounds are touching the front and rear of the magazine at the same time, the rounds are too long (out of spec), or the magazine is too short out of spec).
The heavy marking from contact with the bullet tips on so low on the ramps on the barrel extension is not normal. This may be an indication of another problem, possibly a bad magazine. This will exaggerate any break-in problem that you may be experiencing due to machining burrs on the feedramps.