Reply #97: Depends on a number of factors.

[Hammie]

Caliber for instance. 30 rounds of .308 is pretty heavy. I would think 20 rounds would be plenty.

.223 on the other hand is smaller and lighter and 30 round magazines are pretty handy, though they tend to be a little bit on the long side for shooting prone.

For hunting, 5 rounds or less should be sufficient. Ideally, no more than one would be required but sometimes follow up shots necessary.