It's been a while since I shot the .58 Roberts RRB. I'd not chronographed this rifle before, so was curious what it would do. I was pleased to find this load of 60gr of Goex 2F under a 494gr bullet averaged 1139fps. Not too shabby!
The 19th century factory dip lube worked great too. I went 30 shots without wiping. Even then I could see shiny grooves looking down the barrel. Nice lube star at the muzzle as well.
I made a short video of the fun.
https://youtu.be/t151cMpjyxM