I thought that this bottleneck wouldn't stretch much, but about half my cases need trimming after firing mild loads. uggg... I hate trimming brass, but I have a solution for that in the works...
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Just for clarification, the .30 Carbine is a tapered case, not a bottleneck case. And yes, they do stretch a lot, and since they headspace on the case mouth, you have to pay attention to the length of the cases. I use a Dillon 1200 case trimmer, with a C-H 4D .30 Carbine trim die, with a Redding extended case holder for trimming large amounts of .30 Carbine brass.
Hope this helps.
Fred