I would like to suggest shooting 5 shots twice. On an alternate basis (one Home followed by one Away team member)
A home team member starts first and then in the second set the away team starts.
This gives a fuller event and stops shooters drifting off after their set.
This could give two possabilities.
1) An over all match score
or 2) Shoot person v person 1pt for a win 1/2 for a draw then add them all together for a final team total.

As for rifle I would agree, but in reality PCP have no advantage over springers at this short distance.
Round nose pellets are definately best.

Cosford was one hell of event remember going with my Dad who was taking part.