Quote Originally Posted by deejayuu View Post
The original TP diameter is the same as the rifle calibre. Factory process to ream the tap in situ. involved working from comp. tube end.
This, comically, can result in a pellet being drawn from tap to cylinder if cocked after loading. Slack pellets have been known to fall in if rifle held vertical.
Ours measured 19 mm x 5.5 mm (.22 really) with limited tools.
http://www.airgunbbs.com/showthread....pinions-please
Thanks to all above for the input. @ Modski 66 and Geezer, will get some RWS Superpoints and Superdomes. I have Hobby's for my Crosman 400 (still not the right pellet for that multishot mechanism, just to go off-topic a bit). Will give them a go.

Very good info here, deejayvuu. What an enormous transfer port If this were a pcp, you could shoot deer with it
19 mm long - good heavens. Thank you for the link