This is from the Feb. 2023 issue of Muzzle Blasts magazine, the official publication of the NMLRA. It is part II which discusses the muzzle loading windbusche/air rifle itself.
Page 2 & 3 of the file is too big to upload but you can read the rest at The High Road:
https://www.thehighroad.org/index.php?threads/mortimer-flintlock-style-ball-reservoir-airgun-article-part-ii.916115/
Page 2 & 3 of the file is too big to upload but you can read the rest at The High Road:
https://www.thehighroad.org/index.php?threads/mortimer-flintlock-style-ball-reservoir-airgun-article-part-ii.916115/