We shoot 'em a lot Gene.
No issues with residue or rubber build up.
I can tell you for a fact that they will penetrate at least one side of a hollow core interior door
Also, they work great for rodent control.
I live in a house built in 1830 so keepin mice out in the winter is pretty much not happenin here lol.
I've picked off a few in my livin room with my SP-101 and rubber bullets.
They hit hard enough to tear a mouses head clean off.
I have found that they perform better, and are easier to load, in the plastic cases as opposed to usin brass. Ya don't hafta git into drillin flash holes like with the brass either.
Here's the cases i use. I jist did a quick search online and they are still very available fer 'bout $8 a box.Shipping is 'bout the same so i'd order from yer local dealer if possible.
Make sure you seat the bullet before you prime the case, ( especialy with the plastic cases), or you get and air bubble inside and the bullet will not seat. I believe that my plastic cases are made by SPEER if i'm not mistaken.The beauty of the plastic cases also is that you can seat the primers and the bullets totaly by hand with no tools required. I de-prime by usin a LEE decapper and base.The primer is seated by simply layin the primers anvil up and press the case down over it by hand.
You can either tap the punch with a small mallet or jist push it by hand.
The combo of the plastic case and rubber bullets is pretty darn accuarte too. At least the 15 feet it is across my livin room
Sure wish i could find some .45 plastic cases and rubber bullets for our Vaqeros.
One more point. These components seem to never wear out. I've been usin these fer about 15 years and i have never had to open any more than one bag o' bullets. I have about 4 er 5 bags and am still usin the first bag.
These rubber bullets are a ton o' fun and with a cardboard box with a hank o' carpet hangin in it you can shoot in yer living room.
Airgun traps work very well also.