No reason why the springer entries can't be divided into classes, with different colour score cards for different kit e.g. SR shooters take a blue card, regular springers a white card and gas-ram shooters a yellow card.
At the end of the season, if there have been a significant number of entries in each class, small trophies could be awarded. However, as seems more likely, relatively low numbers of entrants in SR and Gas-Ram grades could simply receive a certificate of score.
In the same way, regular HFT comps could be divided up between .22 shooters, springers and PCP. Personally, I like the option of shooting as many types of kit as possible, so I wouldn't want to shoot a springer in the main HFT comp but save it for the dedicated Springer Comp. On the other hand, some shooters may only own a springer and would welcome the chance of being graded separately in the main comp.
Just an idea.....
D.