I agree with what moorepower said. As I recall, the 17HMR manufacturers had issues for a while, until they figured out some tighter specs for their brass. Some lots of brass were slightly too hard of a temper for the deformation involved with necking down the 17 caliber, and with time (age), they would crack or split. Any contamination would make the problem worse.
Be sure to tell them the lot numbers if you do try to send them back.
Last edited by TinMan; 03-15-2020 at 07:22 PM.
Reason: added info
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