You haven't said if this is a 35mm camera or not.

My old 35mm film camera had an automatic wind for loading film so I've never quite had that exact problem before.

The way my camera was set up I could just put a finger on the edge of it and gently close the back, inching my finger out as I did.

Do you keep your B/W film in the fridge? That may make it a bit stiffer. I believe that B/W film has more emulsion or something that does make it a bit stiffer. There may be some differences in manufacturers also. The only B/W I ever shot with was I believe Trix film, don't remember it being a whole lot stiffer than color film.

Could your camera winder be defective that could cause a problem winding?

If you need to open the camera after film is loaded in, do so in a completely dark (i mean like NO light) room. You'll have to do everything by feel, but you'll not ruin your film this way. Actually if you've ever done your own developing you'll have to learn how to unload the film cartridge, and put it on a spool in complete darkness. Sense of touch is your friend. lol

Only thing I could find online was this...http://www.guidetofilmphotography.co...-settings.html

I'm still inclined to think that either your camera winder is having an issue and may need servicing or there's an incompatibility between the sprocket on your camera and the holes in the film (although I confess I've never actually heard of an issue like that).

Hope you get it figured out. If not try asking at your local camera store if they have someone who can help you out.