The ones I had split around the rim were/are likely at least 50yrs old if not 60 so the brass had turned brittle. I have one in front of me that is split completely around the rim but nothing separated. I give nearly anything a try but will always be very careful to check the bore after shooting them. I have a lot of old rifle ammo from my grandfathers collection. Most of old 6.5mm mauser ammo has split around the neck where the bullet put tension on the neck. I've seen that in a lot of old bottleneck type rifle ammo.
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