what do you consider max effective range for this bullpup? I've never shot past 100

sure it would hit at 200 and even 300, like any other 5.56 if you know how to shoot a little...
put an optic on it, and probably even further...but, what's the EFFECTIVE range on this (I know it's not a sure thing you're taking anyone down at 300 yards with a normal 5.56 rifle...all day at 100 and I wouldn't stand in front of it at 200 yards)....but 300 that little ole bullet is starting to run out of steam...
so...with a bull-pup...wondering if it's same or what other shooters have found out.

I've never bothered to put anything better than an ACOG (4x32) on this as i don't view this gun as anything other than an ideal urban (in houses, etc) type of SDW given how easy it is to move around....but then again, I might just grab my PS90 indoors too....as I'd be less concerned with over-penetration I think with that round than 5.56 round punching through drywall...from what I've seen of taking my SCAR through a shoot-house at a gunfighting school with live ammo...

well, just curious....would love to know what you all think...
thanks!
CJ in AZ