Can someone please tell me the meaning of "full bore" bullets?

I normally shoot Berger 80gr VLD, BTHP. But I see "full bore" bullets at 80.5gr listed as well. What's the difference?

http://www.midwayusa.com/product/107...oint-boat-tail

http://www.midwayusa.com/product/847...ail-box-of-100