There's a lot of good info here. WWE, you look fine. If you shoot NCOWS the Rugers, however great that they ARE, should be replaced with some other replica BP shooters. Don't get me wrong, I'm just suggesting, NOT criticizing! I can't see the picture that shows the glasses mentioned by our pard, Santeen, but reasonable oval-shaped glasses with magnification (the standard reading-glasses type) can be had usually for less that $50 or even less (I bought some that were 1.5 magnification for $25.) River Junction is a good place to start.
Bishop Creek is absolutely correct that BP is more forgiving ... than ANY other powder. Basically, you can't put enough powder in a pistol case to over-load it. That goes for the Cap'n Ball guns as well. As for the Ruger, there is a great pard who posts regularly here on CAS City who was curious about how strong his Ruger Old Army was. It is my understanding that he filled the chambers with as much 4F BP as would fit and let go. If I have the story right, it actually turned it into a semi-auto firearm, by blowing the caps off of the nipples with such force that it actually re-cocked the hammer!!
Scary, but with NO damage to him, bystanders, or the gun ... which he's continued to use - and that happened many years ago! (But don't ask him to do it again!)
By the way, guarding gold with a 10 ga. and a rifle is a MUCH better idea than just pistols!
Have fun and breathe deeply to appreciate the fragrance of BP being fired and seeing the great clouds of billowing white smoke and flames that ONLY comes from real BP!