Slug out of a 600mm barrel?

Ok I purchased a impact 25 cal 600mm. I choose 600 over 700mm cause I like it compact and how it look. Plus I can put it back into the case and don't have to take off the ldc each time I go shoot. Also much easier to carrying when going hunting. I know everyone always wanting the 700mm. But I don't want a 700mm. My question is, will slug shoot with good accuracy from a 600mm? I always see people shoot slug from a 700mm. But not from a 600. So have anyone shoot slug from a 600mm and can tell me how accurate it is at 100, 150, and 200 yards. I want to push it past 150 yards and up to 200 yards. I keep hearing people say you won't get good accuracy from a 600mm cause you need to push slugs into the high 900 and 1000 fps. Which they claim the 600mm can not do.