Just taking the AMR and some ammo from ED-E's inventory added 30+ for one fight.
The fact I don't get bogged down with loads of food or other healing items, junk and had plenty of ways to repair items without hauling spares.
Would lead me to say having the AMR as a main weapon often, would need very good management, even with a 220 weight limit.
Its true. As cool as the AMR is, its a very heavy weapon that uses very heavy and unique ammo (Its the only weapon that uses the .50 MG round). When you compare it to other weapons such as the Brush gun and ranger sequoia, it kind of falls flat. Both of those weapons have impressive damage, comparable to AMR after applying the right ammunition and perks, weigh much less, are almost as accurate (Sequoia is amazingly accurate with trigger discipline) and the .45-70 SWC ammunition they use also has armor piercing capability. In addition, their rate of fire is much faster, making them viable weapons in short-medium range fights, where as the AMR does not hold up very well in those situations, especially again multiple targets.
With my current character, i ended up dumping the AMR for the Sequoia, Brush Gun and Mysterious Magnum (which is used as a holdout weapon when entering casinos). Have been much better off since.