I couldnt find this answer anywhere, so I thought I might ask if anyone has documented data on the optimum diameter to let air through in the bolts of pusher breeches. I have a brass retaliator with a simple breech, and I noticed that adding a few layers of tape to fill into the space before the dart (i.e. the bolt) to kill some of that unused deadspace increased my ranges very marginally. Obviously adding too much, and you constrict your airflow leading to your chamber like a coffee straw. It therefore follows that there must be an optimum amount of deadspace to fill in. Can anyone comment on what they've done with their builds?
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