The M3 is a great scope. I loved mine. I only sold it to get a USO. As far as the pre marked dials you have the MOA marks below those and can use those or do like I did and remark them. All you need is some masking tape, krylon paint and a fine sharpie marker. Tape off the MOA marks and the numbers 0,5,10 etc. Now paint the top with the Krylon,I use tan as it's easier to see. Now just write you actual data for the load above the corresponding MOA mark with the sharpie. Then write for what load it is on the top of the dial and you're set. You can also tape off the markings and paint the top green or black again if you like. The other good part is that all the dials are marked in the same MOA so you actually have 4 dials, I think they still come with 4, that you can use for different loads or shooting loactions if the elevation/temp changes. I couldn't find the close up pic of the dial but here's the pic I used when selling my scope and you can see how i marked the dial
The 1 MOA marks won't hurt you at all for hunting either. You'll only be at most 1/2 MOA off so that's only 5 inches at 1000 yards. Like I said I loved mine and used it at tactical competitions for a few years and it worked great. Good luck with yours.