Been doing this archery stuff for over 45 years and can honestly say this is the first I’ve ever heard of pre-stretching a string, although I am aware of stretching them with heat or friction heat.
Part of the nostalgia of traditional archery is checking your brace and nocking point height every so often and maybe giving a twist or two to know you’re in tune…8^)
Ironically have never had a problem or issue with a bowstring all these years until this past season.
Had a fast flight material type (sorry don’t remember exactly what FF material grade, because I’d had it for years), but anyhow, it always seemed a little long and would have to twist it a few times or so a year to bring it back to correct brace.
Well it was wound tight (tighter than any other I’d ever hunted with).
Anyhow, I had wool puff silencers on it and on the way to stand got them all burred up. Like I had done hundreds of times in the past, drew about a third draw or so and kinda plucked or dry fired it to flick some of the burrs off.
Well this time there was a loud crack, and I thought I’d been shot…8^) The string had failed and almost broke in two. Scared the crap out of me. I thought the bow blew up, but fortunately, and luckily, no damage to the bow.
Worst thing, it ended my hunt that day because I was in the field with out a spare string. I never carried a spare because I’d never had one fail before,,, and it was peak rut at the time and I was not happy…8^)
It was the first string that ever failed on me in my life, but lesson learned - if they are to long, do not twist them “tight” to shorten… Get an another shorter string,,, and carry a spare if its peak rut...8^)