I have recently updated my Ammunition Photo Gallery (mostly covering anti-tank rifle and HMG up to 57mm automatic cannon) by posting several new photos including recently acquired cartridges: quarry.nildram.co.uk/tankammo.html
Two of them are a bit different: replicas of the 25x183B (PG87) and 37x240 (Type 76) rounds which are unique to China. I have only ever seen photographs and catalogue entries concerning these rounds and there seems little chance of them becoming available to collectors in the foreseeable future, so I amassed all the info on them I could (with special thanks to Dave Elfeldt for producing some technical drawings) and had a friend make up replicas, machined from solid aluminium, for display and photographic purposes.
The 25x183B, which is used only in army AA guns, bears a remarkable resemblance to the 23x152B only much bigger. The 37x240, used only in naval guns, is very similar to the 35x228 Oerlikon (in fact one of the Chinese naval guns advertised by NORINCO is available in either 37x240 or 35x228).
Here are two of the pictures from my gallery: