I experienced the same this past fall. I shot a nice 3-4 year old bull, dropped in his tracks and the animal wasen't stressed at all. I cut the backstraps off and the tenderloins, the rest went to the butcher. We make meal portions with the vaccum sealer with marinate and freeze, but they still were tough, although still very tasty. The tenderloins were not as tough as the backstraps.
This was a farm-land bull, not sure whether that has anything to do with it?
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