The difference between a range rod, and the wooden ramrod, is the ridgidity, and handle, and or knob, on the range rod. That ridged rod, with its comfy knob, or handle,and muzzle guide, allows one to load in one rapid stroke, without fear of breaking the rod. Rather than a couple of slower staged strokes.
If accidents happened every time, the problem would be well known. But, everything has to be just right for combustion to occur. Look at the reports of accidental discharges while loading, and you will find that in most cases they have no cause that is discernible. I bought a firepiston just to test the theory. They are a finicky piece of equipment, that requires proper seal,rapid stroke, and proper combustible material with just the right amount, and type of lubrication. I think caliber, and barrel length may also play a part but have no divinities proof.
I just don't want to take the risk. I also feel that if you are focused on how fast you can load your muzzleloader, you need to move on to something more modern.
Hungry Horse