I made a demo showing various cannon shell bugs. http://rebootilicious.rbcorner.com/emp_temp/shells.rar Skip ahead to tick 63780 to see a shell that goes really slow after firing. Demo also has me falling under the map when exiting a tank, followed by me trying to re-create it with no luck.
I had a bug on duststorm in 1.073 a long time ago where shells fired at certain angles against palmtrees would change direction and fly slowly, it may have something to do with collision models and the game thinking the shells hit, while they didn't.
I remember the bouncing-shells thing too (the one that solo is talking about). It was reproducible in that CW training map a while back.
If you notice from the demo, when the shells first spawn, they look like the HL2 rockets, and then the model changes. I think whats happening is the shells spawn on the edge of the collision barrier and bounce off of it before they are set to explode on impact. Oh, and on my tankwar map, I had been bouncing arty shells off the wall at one point, but when I tried to use fraps, it wouldn't do it anymore.
I have the arty duel shell bug. As a norm I always bind both shells to primary slot 1. Well with 1.08 Rc7 I get splash damage. The shells hits its target but still gets my arty shelled to death.
i mentioned this way way way back when i 1st did the mortar model, what happens is there is actually 2 firing mortar models in standard half life 2, one thats got the fins closed and comes out about a foot then it changes to the other that the fins are opened instead of valve animating the fins opening up im guessing they just made it change from one to the other . i think maybe that part needs to be cut out :D
The "slow moving shell" bug is in RC8, too. I can reproduce it pretty well on emp_slaughtered with brenodi med tank. Whatever, i dont think its that important to fix it.
well, it isn't finned. its a cannon shell, afaik no cannon shell has fins. actually i think spawning 2 models for 1 use would lag more ... maybe if they cut that sequence out it would cut half the lag when shooting lots of missiles