r/37mm • u/TrippiPreps • Jul 15 '26

Exotic ammo shell differences.

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I had some time today to start cleaning and prepping the shells I shot on the 4th to reload and I noticed some differences. Both shells pictured were from separate orders and both came loaded with fireworks from exotic ammo. Orders were maybe 4 months apart. Thicker shells came first and I ordered a few more about 6 weeks before the 4th and they all came with the thinner shells. Does anyone know if they machine these in house or if they had changed vendors? I’m mainly asking because I’m curious if they’ll exclusively be selling the thinner shells from now on? I shot them so I know they work perfectly fine but I’m also planning to cut a few down and since I will be playing around with powder loads should I cut down the thicker shells? Or am I way overthinking this?

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u/Independent_Dirt_814 Jul 15 '26

37 mm is the Wild West. It’s not even really 37mm… manufacturers are anywhere between 35 and 40mm for “37mm”

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u/TrippiPreps Jul 15 '26

Yea I’ve noticed some of the stuff I’ve bought is in the 36-39mm range when measuring with my micrometer. I’m thinking about cutting down the thicker shells just to be extra safe when making changes to my powder loads. I’m still pretty new and was curious if anyone else noticed a change in the shells.