That makes a lot of sense to me that it was safe in your 19.5" (right?), and then the significant dwell time in the 28" was putting pressure on the case as it was being extracted. And people wonder why ammo makers go mild on the loads. This is good info for all to look at as an example of that. Thanks for the detailed photo and further explanation.
As I was just decapping/resizing, and polishing brass after posting above, I noticed that several of my Grendel brass pieces have some soot on the necks. I don't know what load they were, but I've only been shooting the 100gr NBT's the past 2 times. They could have been some 123gr Scenar or 120gr SMK loads from last year though. I don't plan to shoot any 120's or above in my 16" Grendel anymore really. I'll try the 107 SMK's and 108 Scenars for a target load later on, running fast, and use the 100 NBT's as a testbed for jug destruction.
As I was just decapping/resizing, and polishing brass after posting above, I noticed that several of my Grendel brass pieces have some soot on the necks. I don't know what load they were, but I've only been shooting the 100gr NBT's the past 2 times. They could have been some 123gr Scenar or 120gr SMK loads from last year though. I don't plan to shoot any 120's or above in my 16" Grendel anymore really. I'll try the 107 SMK's and 108 Scenars for a target load later on, running fast, and use the 100 NBT's as a testbed for jug destruction.
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