I shoot everyday in the basement at 50 feet. I own a HUGE collection and enjoy Iron Sights offhand best. It's really great for better Field Target standing/scope performance. In order to see my hits without a scope I have a video camera on the target and 30 inch monitor at shooing area. I can even score hits from the monitor. It's really alot of fun.
I also have a crow knockdown and Rat at 7/8" and 1/2'. For 10 meter shooting I have a target crank system with Jacket,shoes,shoe trees,gloves,ect.
For Running bore I have a Gamo traveling Deer target track. It's not competition quality but affordable and fun. Works great actually and batteries last a long time.
I also have a bell target to ring.
Split the Ace of Spades on edge is always a fun time. Novice/Guest shooters in my basement can go home with a card cut in half.
I supplement the basement shooting with other projectiles like archery, Darts, and Slingshots. I'm gettin wicked with Slingshot shooting. I have learned sooo much from web site advice. Best of all, you shoot the SAME ammo over and over. FPS and Ft/Lbs can be impressive.
Enjoy your winter basement.
DonC