it is hard to really show what I had to do here, but if you have a ruger mag handy, even just eyeballing the two mags you can see definite differences on the insides of the feed lips themselves. The angled edge inside the lips, that control the rim of the cartridge is where I had the most issues, once they are filed down the rounds feed much better, as for my bolt slamming the back of the mag, that may not be the case for everyone could be a case of gun to gun differences.
The circled area on the uppermost part of the pic "the stepped area" as I called it, once I had it filed down the rounds quit feeding to the right.
On the lower lip if you look inside where the rim is fed up as well it was too pronounced and rough, "filed" it down with edge of triangle file slowly to make all edges have a rounded profile
And the back where the bolt picks up the next round was my big issue, that not all may have, but I filed it with a stihl round file to round out the bottom and widened it slightly past rugers mag specs, mainly because of the side to side wobble these mags have I didn't want it to hit if there was any pressure on the mag.
I don't know if this was helpful at all it is much easier to do it then explain it.
I have recently put about 250rnds through each mag, the springs have broken in and I can fit my 25rnds in without an issue, however, it seems as though they work best with no problems at all if I put a bit of rearward pressure on the mag when shooting. The old (14yr old federal from father in law that was in his barns heated room) ammo I was using is what caused this, when using mini mags or even federal bulk walmart special I did not have to do this.