I also live in hockessin. Your best bet is Atglen but they only take new members in Feb. Membership is 125 first year 85 after that. It is about a 25 to 30 min drive from my house. They have 25 yard hand gun, 100 yd rifle, 100yd shot gun/muzzleloader, standing and 3d archery, sporting clays, and a main rifle range with berms @ 100yd, 200m, 300m ,380m, and 500m. If you want to check it out they have competitions that are open to the public or we can set up a range trip.
Another place worth looking at is Delaware county field and stream. They have rolling membership. I have not been a member for years but I think they have 100 yds. I think membership was 85 when I was a member.
Brandywine hundred rod and gun has ranges out to 200yd but it is hard to get in there and more expensive than the others.
Bridgevill is a long drive from hockessin.