Hay Camel: unfortunately some ranges won't allow breakable targets except for trap and skeet. My range won't allow cans and I haven't heard of a range, in years, that has allowed glass bottles.
As for the trap and skeet shooters - I'm glad the fellas at my range are such crummy shots - they leave a lot of those birds unscathed and those make excellent targets. If you're shooting the 50 yd line you have a 4" target - good offhand practice. If you can stretch it to 100 yds those birds get pretty small. Best thing of all is they are reactive (bust up), bio-degradable, come in two different colors (front and back - lol), and are free. Other than that, I have taken my paper target after becoming so frustrated with my overly large groups, balled it up and stood and shot at it until it was confetti. It reacted pretty well, so it wasn't a 'still' target.
Some guys hang ballons from their target stands - they are tough to hit in a wind but they are adjustable for size if you want a challenge (lol).
There are also 'Duelling Trees'. I don't know what caliber you shoot but those reactive targets are fun to pratice with, especially if you have a hunting or shooting buddy whose skills are on par with yours. Well, hth. Mikey.