I've posted this in another thread, but Trailboss works fine even in the Whisper/BLK as long as you are using short light bullets that don't go beyond the neck area of the case. Based on the loads I've tried in the BLK and this new case having more capacity, I think you would probably be ok with 180 flat base bullets and TB, if you could seat them out a ways. It's worth a try. Sierra 150 pro-hunters (for the 30/30) should be great with TB in your new cartridge.
Regards,
-Dan
EDIT: Guys, I've got a fair amount of the Sierra 150 PH's. If you would like me to send you 20 or so to test with Trailboss in the 7.62 Covert, let me know.
Last edited by snipecatcher; 05-25-2011 at 04:47 PM.
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