by Seismic Sam on Tue Jun 11, 2013 8:38 am
Well, that 45 Glock torture article is interesting, but really of very little value. Seeing as it's factory ammo, there's no telling what kind of powder was used, so who knows if it was fast burning or slow burning? I'd think you'd worry a lot more about running titegroup or bullseye than a slower powder, and from the backtalk it seems like Tim's loads are slow burning, but that's how he manages to make Major without blowing up his gun in 9mm.
If you wanted to do a designed experiment, you could select a caliber like 10mm or 9x23 Winchester, set up a base load that was relatively low, and then reproducibly set the bullets in increments of .020" deeper and shoot strings of 5 over a chrono to see if the velocity increased, and also see what the primers looked like. THAT would give you quantative data. Maybe I'll do this in my Springfield V-16 45 Super with 45 Super brass using 45 ACP loads, providing the wall thickness doesn't get in the way, and see how that works.
On the more basic issue of 45ACP setback, I would like to qualify my position first: I can't remember who said what in this pissing match, because I didn't pay attention that close as to who was pro and who was con. So please don't get your knickers in a twist, or take this personally, because I can't keep straight as to who said what. That being said, I'm formally calling BS on this entire theory of 45 ACP setback. I have read every major reloading manual published since 1971, still have them all, and not ONE has ever mentioned any propensity of the 45 ACP to have setback problems. Read both volumes of PO Ackley's book, 6 revisions of Cartridges of the World, and not one whisper about 45 ACP setback. Oh, as seeing as this is a mission critical issue if it exists, where are all the stories about 45 ACP setback from WWI, WWII, and Vietnam?? Plus I don't recall John Dillinger or Creepy Alvin Karpis bitching about the Colt 1911 OR the Thompson. Now, I VERY clearly recall the issues with the M16 early on in Vietnam jamming because some idiot said you would never have to clean it, and those are real and have been substantiated, plus there is now a bolt assist feature on these guns to help with that.
But the 45 ACP?? 100 years of reliable service, and never a whisper of setback problems. Until I ran into this thread, I never heard of this "issue". Sorry folks, but I'm not buying any until I see ONE published article that DIDN'T come from ARFCOM or some other internet source describing this problem and providing some published data showing amount of setback vs. increase in pressure.
