The Glockenklang web site rates this cab as 8 ohms and 300 watts.
If that's right, then your amp is 250 watts into 8 ohms, so you'll be fine. Another cab will push the amp to 440 watts into a cab total of 600 watts at 4 ohms.
In either case, unless you go really mad with booster pedals, I don't see how you could damage the cab.