add two frames at the front and three at the end/leader to allow for this problem. Watch your film counter -- you can't squeeze that extra shot on with bulk.

the extra is also why I don't recommend short rolls like you did unless speed is of the essence -- you can get 20 rolls of 36 out of a 100 feet, but if you roll 24s or even 20s you double the amount of waste and, obviously, reduce the amount of film you actually shoot to the point you are no longer saving money.

not sure what ur shooting, but freestyle's arista professional, the re-spooled tri-x in a purple box, actually costs the same whether you buy 20 rolls already spooled or buy it in bulk -- if that's your film of choice, save bulk loading hassles and increase yur supply of empty film cans in the bargain.