I don't see anything to be gained by shooting them. You can recover the bullets, powder and brass. You're getting good groups but you're going to change primers anyway. So, you'll re-develop the load with the harder primers. You'll find your tight group again.
For load development, there are 2 popular methods; Audette Ladder and the OCW. Check them out. I favor the OCW because it doesn't require more than a 100 yd range and it's pretty easy to interpret the results.
Good list of lessons learned.
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Another thing to read up on is pressure sign indications. Flat or cratered primers don't necessarily tell the full story. What you've seen is a pressure sign but it's related to the suitability of the primer and not overpressure of the load.