OOB Modding without cheating

[PatG]

The PBEM engine checks to make both sides are using the same OOB. If they don't match, it will let you know. If your opponents are asking you to use their up-ammoed OOBs in PBEM then the choice is yours.

I'm not sure how much ammo you would have to add to the average tank to see a serious degradation in performance. Given that you can (un-historically) put a section of men on the average tank - say 1600 lbs or so of meat, adding 10 or 20 shots of main gun ammo isn't going to make much of a weight difference. If you need to re-load, then the normal ammo carriers will do the trick.