The toy plastic ring caps are more sensitive to going off during capping so be sure to use a push stick.
One fellow on Cascity was seriously injured due to accidental ignition during capping.
See the photo in post #3 [click to enlarge it] and his warning statement in post #4. --->>> https://www.cascity.com/forumhall/in...ic,1620.0.html
And skinny 1950 posted on thehighroad that it also happened to him using the toy caps.
"I was using toy caps for quite a while with my Uberti 1851 Navy until a cap went off as I was putting it on the nipple,the ball shot out the side of the gun hit the frame and shaved a slab off. I don't know where the ball went but I sustained a minor injury to my thumb. Good thing it was pointed downrange or someone could have been hurt. Up to that point the toy caps were working great as they don't jam up the gun like the CCI #11's. Anyway the toy caps go off a lot easier that metal ones and could lead to injury." [Post #41] --->>> https://www.thehighroad.org/index.ph...2#post-7036183
Also, the plastic ring caps may also be more susceptible to creating a chain fire.