burntmuch,Sounds like you have it covered with the Midland Range, but here are a few other ranges that seem to meet your 300 yard criteria: (just in case)
Blue Water Sportsman's Assn. 4470-4498 Ravenswood Rd Port Huron, MI 48060, 810-364-9894, Outdoor Pistol (25 - 100 yds), Indoor Pistol (25 yds), Outdoor Rifle (100, 200 & 300 yds), Rifle Silhouette, Pistol Silhouette, Muzzleloading, Trap, Skeet
Chippewa County Shooting Association 6600 S Ridge Rd Sault Sainte Marie, MI. 49783, 906-635-9700, Outdoor Pistol (100 yds.), Indoor Pistol (50 ft.), Outdoor Rifle (300 yds.), Muzzleloading, Trap, Skeet
Clay Games Inc Shooting Club 719 E Girard Rd Quincy, MI 49082, 888-465-2529, Outdoor Pistol (25 yds), Outdoor Rifle (50, 100,200, 300 yds), Rifle Silhouette, Pistol Silhouette, Muzzleloading, Trap, Skeet, Sporting Clays
Muskegon Pistol & Rifle - Howard J. Kerr Range 741 Carlto, Muskegon, MI 49442, 616-773-2351, Outdoor Pistol (Up to 300 yds), Indoor Pistol (50 ft), Outdoor Rifle (Up to 300 yds), Indoor Rifle (50 ft)
Ottawa Sportsmen's Club Hwy M-38, Baraga, MI 49908, Outdoor Pistol (50 yds), Indoor Pistol (50 ft), Outdoor Rifle (400 yds), Indoor Rifle (50 ft), Muzzleloading, Trap, Archery
Qua-Ke-Zik Sportsman's Club 11400 Foreman St Lowell, MI 49331 616-897-7635 Outdoor Pistol (25, 50, 75, 100 ft), Indoor Pistol (25 ft), Outdoor Rifle (25 - 400 yds), Muzzleloading, Trap, Sporting Clays, Archery