oneounceload said:
20+ years of reloading for a Glock and no issues
Sounds like operator error
16+ years of reloading for Glocks and 250,000+ rounds of 9mm/40S&W/45ACP in various Glocks and I have not experienced problems. HOWEVER, there are issues to consider.
KaBooms happen not just in Glocks (KBs existed long before Glocks and plenty of 1911s have blown up and I personally have seen many other brand KBs) and I have seen them in higher pressure 40S&W and lower pressure 45ACP also. Most of the cases involved suspected double charges and rest were probable mixed up powders/load data that led to overcharges.
One of many reasons why I endorse the use of Lone Wolf barrels in Glocks is this. If you use mixed range brass (and most of us do), you have no idea how many times the brass has been reloaded (some of us tumble polish our brass until they have mirror shine so you can't tell
) or how hot/over max they were loaded to. When we run across bulged "Glocked" brass, some will recommend the use of Lee FCD "Bulge Buster"/Redding G-RX to push-through size the base of the bulged cases, but the repeated bulging and resizing of case walls will just add to the weakening of the brass. Eventually, high pressure gas may escape through weakened case wall if support is not there and overpressure situation exists. I will say that for 9mm/40S&W Glock barrels, Gen3 and newer provide comparable case base support at the ramp area compared to other factory barrels. HOWEVER, 40 S&W Glock chambers are still more generous/wider, allowing bulges to occur about 2/3 way down the case neck (see comparison picture below). In comparison, Lone Wolf barrels have very tight chambers (tightest I know) and won't allow bulging of cases. It is my opinion that cases not bulging extends case life and minimize weakening of brass. Besides, resizing spent LW cases takes significantly less effort.
I have reloaded and shot matches with G22s and a lot of Montana Gold jacketed bullets using high range load data of W231. My Glock cases show no bulging or just slight bulging that gets resized with regular Lee carbide resizing dies (no, I don't need to push-through resize with FCD). If I use max/over max loads (can you say 9mm major?), I prefer to use Lone Wolf 40-9 conversion barrels with thicker chamber/barrel or fully supported LW 40S&W barrel for extra level of insurance.
Below are comparison pictures of my Gen3 Glock and LW barrels.
Gen3 Glock 27 barrel shows better case base support at the ramp area than Gen1/Gen2 Glocks of the past, but is still very wide at the case base at the ramp area and around the case (2 O'clock to 10 O'clock). In comparison, LW 40S&W barrel shows full support of case base, especially at the ramp area and much tighter all around the case.
Over the years, I have not witnessed any 9mm Glock KB. This picture may explain why. Gen3 Glock 17 barrel on the left shows exposed case base at the ramp area, but the rest of the chamber is tight against the case. In comparison, LW 40-9mm conversion barrel shows better case base support at the ramp area and tight support around the case. The tighter support of 9mm Glock chamber (even there's exposed case base at the ramp area) may minimize repeated bulging and reduction of case during resizing that may weaken the brass.
I usually recommend to people that reload for Glocks that if they see bulges in cases to reduce their powder charge or change powder. Can LW barrels extend case life and possibly prevent a Glock KB? I can't say for certain but have done tests of once-fired 9mm/40S&W cases in Lone Wolf barrels with mid to high range load data of W231/HP-38. Even after 50 reloadings, I have not gotten case failure. I may do a test to see how many times I can reload before a case actually fails.