So.. You never get scratches with your flawless XTR, but still feel it necessary to tell others to waste 50 feet and run the film through 3 times because .. Why again? The film runs differently through the mag each time? Hmm. Sounds like a crock to me.
Well it ain't. I don't send nothin' to nobody without re-loading at least 3 times.
Why? Because the film will never be in the same place when you put the magazine on the back of the camera. The upper or bottom loop, maybe bigger or smaller, even by 1 perf and the camera will work/sound fine, but since YOU CAN'T SEE THE LOOPS then you don't know?
This is why when rental houses send out a magazine with 10 feet of film in it, but every roll the customer shot is scratched, it gets me pissed off. I've heard this happening to friends of mine, through reputable rental houses and it's never going to happen to me. It may sound "excessive" but if you TRULY wanna know if your camera will scratch film... ever, ya can't just run 10 feet through it and say "ok all done".
We don't have the luxury to re-shoot things because the camera wasn't perfect. Again, this goes back to the "check the gate" discussion and why I've NEVER had a hair in a 16mm or 35mm gate in my entire life. Cuz I test the living shit out of the gear I use and I keep it clean. When I'm at Panavision renting a camera, I bring a roll of film with me and run the entire roll through the camera at least 2 times, maybe even more. I'll then go home and rewind it to check for anything and only then is it "approved" for use on any prodution I'm involved with.
Wanna know something else? My stuff comes out perfect every time. It's only been some technical hiccups due to over-sized rolls that have given me some issues this year.