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Kframe - No doubt your MAIN problem is the HS-6 which is simply the wrong propellant for the application. I recently had the same experience with 125's using Universal, a propellant that is even faster than HS-6. I loaded right up to max for +P and used a very firm crimp to bring up the pressure, but even that still resulted in lots of unburned propellant. I'm going to try Clays or similar burn rate. HS-6 and Universal are great propellant's but need to be pressured up for efficient results. Tree Rat.
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