Pancor jackhammer is worse than p90 right now. And it range sucks. Addictional ammo could change that situation.
p90 isin't good? say it too this all people who has gained a lot of extra holes to bleed from my p90 ^^ P90 need only working bonus rate of fire to be fine. (ew. 2 types of usable amo like in F2: 10mm and/or 9mm, it was nice advantage of this weapon). But when we speaking about p90 you need remeber that it isn't kick ass vaporizer but small handy support weapon.
And Pancor is a loooooooot worser than p90, Pancor right now is totaly useless, yeah, ok you can use this to hunt rats etc. ew save amo when killing raiders :/