Only if you are shooting new factory ammunition and reloads with brass that's been reloaded limited number of times. Brass case length gets shorter as reloaded repeatedly which is a well known fact.
As brass case length gets shorter, chambered rounds stop headspacing off case mouth and starts to headspace off extractor (To check, chamber reloaded rounds in barrel. If case base rim is below the barrel hood, the round will headspace off extractor). I don't think reloaders will stop reloading shorter length cases as most of them likely won't know when their brass case length gets short enough to start headspacing off extractor.
As I mentioned in Post #3, use of 10mm-to-40S&W conversion barrel will allow less gas leakage/more consistent chamber pressure build for better accuracy but I do not believe shooting 40S&W in 10mm will damage the firearm. Like shooting .38 Spl in .357 Mag ... No damage, but perhaps more cleaning. (And I shoot copper plated/washed 22LR in my .223 ARs with CMMG conversion bolt ... And no damage, just a bit more cleaning of fouling from blowback action)
I am actually doing a "myth busting" thread on longer vs shorter 9mm cases that no longer headspace off case mouth in the "Handloading & Reloading" subcategory and will post my findings in a new myth busting thread -
https://www.thehighroad.org/index.p...ngth-and-accuracy.901574/page-2#post-12208272