I measured it again. My mark was off a bit. The face of the breech plug is the left edge of that black mark in the picture.. I measured 65g of corn flour, dropped it down the barrel and measured it with the ramrod. The ball or was and shot will sit in front of the touch hole no problem. I just need to finish inletting the lock plate to get a tight fit against the bbl.
If you didn’t already oil the inside of your barrel. Please do. The heat from soldering will have evaporated the oil film inside your barrel where you soldered the lugs on leaving those areas vulnerable to rust. BJH
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