I feel your pain.I have several .40S&W pistols.one of them is a glock 23.has the glock barrel.I have shot???gaads a buncha reloads thru her.I find the brass that runs thru the glock.even after resizing will not fit in the chamber gauge.there is a bulge in one area at the web.( I picked up several 5 gallon buckets of remington brass at the ranges around here when LE transitioned from what ever they were carring to the semi auto pistol in .40S&W. the feds around here had a ton of ammo to blast off for the transition and they were kind and did not pick the spent brass up).
I load the stuff on a dillion 550,a dillion square deal and have RCBS and lee dies for the .40..I resize all my brass on a RCBS rock chucker,and clean the primer pockets before running on a progesive press.I was concerend as you about the 40,as every manual has something extra written about it where as nothing is written about any other pistol cartridge.I checked every case in a guage when I was done resizing.as I knew glocks had an over sized chamber.every cartridge that did not plop all the way in.I put in a separte bucket to deal with later.I called lee and told them what was going on.they had a great fix.their carbide crimp die,they said take the seating part out.(just unscrew it out.)and they whould provided an insert to go into the shell holder and push the case all the way thru the die.the next case would push the 1st one up to the top of the die.some would catch on the internal thread in the die.so I took it to a machine shop and had the threads removed.then adapted a hose over the top that feed the cases in to a bucket.the thing worked so well I use it for my 10mm now and have the same setup for my 9mms and 45acps.it takes the brass back to factory specs and does not seem to strech the case.
you seem like you do not have much brass,I bet if you found out where your local feds shot and trained and the local PD.and went to the range.and asked..they would gladly turn you on to a bucket of brass.you will find that it is hard to get thru it enough to start having brass crack on you.Hope this helps a little with all the other info you get and find someting that works for you.oh yea.glock OEM barrels do not like cast lead bullets.and that I belive is why most folks get an after market barrel so they can shoot the cheaper cast bullets.