Until i buy the proper equipment: ie, a spotting scope (which is probably never considering it's been like 5 years since I should have one)
a, big caliber, big holes (lol) but I don't shoot my big-bore gun at long range.
b, don't shoot paper since it's boring and I can't see my hits
c, shoot steel targets and listen for the 'ping!'
d, use the 4-16x scope i have on my two target shooting rifles- marlin 22 and savage 11 223.
a spotting scope isn't expensive, i've seen Big 5 have them for as low as $60 on sale, I just keep pushing it off.
I favor steel targets, especially at longer distances because if you're doing it wrong you won't hear the ping. it's not precision but I don't have scopes on the other rifles so I'm not shooting precision if I can't aim precisely.
I don't really do precision shooting, it sucks the fun out of shooting. What makes me happy is when I challenge myself and hear the ping shooting rifles at ridiculous ranges they're not designed for- ie, SKS at 700m, wasr at 600 yard, mosin at 500m. A good day means I manage more than 3/4 of shots hit the target. From this I know i'm more than capable of doing tiny groups at 100 yards, I just don't care for it.