There's a generation of heavier JHPs made for fast twist (and often short barreled) ARs these days. Try Black Hills, or even Wolf, Prvi, et al. Everyone makes one.

Or one can try M193 type FMJ rounds.

Of course if someone isn't worried about carrying around a certain weight of ammo, there are 30rd mags to be had for FALs. Even NATO spec 7.62mm rounds are zipping along about like M2 .30-06 ball did. That always seemed to work well enough, at least I don't ever recall reading any complaints about it.