A couple FWIW thoughts. I have been reloading since 1969 and 95% being revolver handloads (total of 10 guns in 38, 357, 44 S, 44 M, 45 Colt) and 98% cast bullets. While I don't count there's a very good possibility I have reloaded/fired tens of thousands of rounds in my reloading/shooting career.
My all time favorite cartridge is the .44 Magnum and I have 5 guns chambered for it. For a few years (?) I reloaded and shot the 44 almost exclusively...
Yesterday, just for my own info I measured about 100 44 Magnum cases. My once fired Starline brass varied .003" in length, 1.279"-1.282. Some new unfired, unsized Starline measured 1.277"-1.279". My many times fired R-P brass measured 1.280"-1.284". Some Hornady, 1.279"-1.282". After digging in my stash for the oldest (I think) brass I found some very old WW and they measured 1.279"-1.285". So, my stash of 44 Magnum brass, even if I used the shortest and the longest mixed in a batch would only be .006" difference in length and how "inconsistent" would the crimp be with that little variation? All the brass I have is from about '90 reloaded numerous times to brand new purchased a few months ago (I only closely counted one batch of cases, Federal, and stopped at 13 reloadings of med.-heavy magnum loads. Others have gone beyond that I'm sure.)...