Any field situation the reason for wanting to up the velocity? Don't get me wrong, I've up'd the velocity in the past too. 12 gauge blue magics. Primers backed halfway or more upon firing. My early days. Loaded them with Winchester 12 AA data. They sure we're quick. Only downside to 20 gauge for dove is shotstring length. Fine for over water hole but wing shooting not so much. Better a 1 ounce 12 gauge that easier to increase velocity on safely. Shotstring length is often not considered. It's a important factor in wing shooting.