I just picked up some arrows from the shop. I had them cut them at 30". Well, after I got home i realized they were a 1/2" longer than my normal arrows. I measured from end of the nock to the insert, they measured from part on the nock where the string hits to the insert. Anyway, my fault, but how much will this affect my arrow flight and point of impact? These were supposed to be my reserved for hunting arrows.

not much at all, ctually i wouldnt worry about it

It shouldn't affect too much if they are spined correctly. However, a with anything in archery the best way to find out is to shoot them and find out.

I f you do want them cut off at some future date then wait till they need refletched and whack 1/2" off the nock end.

sounds like a good excuse to buy an arrow saw and a flecthing jig if you ask me

exactly