Could well be down to short stroking.
It could also be a failure of the hammer to stay cocked between shots. There can be lots of reasons for this, but the most common, and most often overlooked, would be your cocking rod coming loose. Another common cause would be your hammer lug needing to be lowered a little.
Check your cocking rod is tight first. Then practise your trigger technique. If neither solves your problem, get back to us, and we can talk you through adjusting your hammer lug, as well as some of the other possibilities.
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Got to go home by 1am, the bottle wins the battle again.
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