FT's dead on with his answer; I've several of these reels (love them, just DON'T over oil same!!!) and it varies from about 125 yards to 150 with a given line. Longer the head (think XLT) the less you can pack on.
Although it's a pain in the fanny you could do a reverse job and put the line (tip first) on the reel, wind it on, add as much backing as you can, then strip it all off and reverse same.:saeek: