So I bought an IJ-70 (my first Makarov) the other day for 150$, and wanted to test it out. Cursory field stripping indicated a very strong rifling, with clear cut grooves. However, when I fired S&B 95gr ammo that came with the pistol, the bullets were keyholing all over the place. Switching to Hornady JHP rounds, it fired correctly. Does all S&B ammo usually keyhole? Any opinions?