In the past I've noted the difference in shot to shot uniformity between lubes like spit and the oils or greases as well as the jump in variations using pyrodex.
I recently found some chronograph results made in my .58 Hawken back in 1978. The barrel was 34" long, 1 1/8" straight octagonal & the rifle weighed around 12 pounds. Still with heavy loads, it kicked a bit with that narrow, hooked butt plate. Powder was either GOEX or GOX or C&H
: 95gr. 2F - .575" 285gr. RB .022" denim - spit, 1,424fps 48fps variation----bear grease, 1,490fps 97fps variation
140gr. 2F - .575" 285gr. RB .022" denim - spit, 1,683fps 10fps variation----bear grease, 1,736fps 69fps variation
160gr. 2F - .575" 285gr. RB .022" denim - spit, 1,792fps 8fps variation----bear grease, 1,867fps 74fps variation
185gr. 2F - .575" 285gr. RB .022" denim - spit, 1,887fps 9fps variation----bear grease, 1,951fps 42fps variation
This rifle, with the powder avaiable to us back then, shot pie-plate sized groups at 100 yards using 95gr. 2F,however with 140gr. would hold in the 1-1/2" range with spit and just over 2" with bear grease. At this time, the bear grease was about 4 years old and still working well for hunting.
More Cronograph stuff, same gun.
675gr. Minnie 150gr. 2F - 1,250fps - 2,342fpe 72.80 KO value(J. Taylor)
675gr. Minnie 160gr. 2F - 1,325fps - 2,605fpe 77.20 KO value(J. Taylor) This load approaches the .577 Black Powder Express for bullet weight and powder charge (eceeds some listed loads), but is a bit slower than the highest listed velocity, by 300fps. That could be due to the accuracy of the chronographs (or velocity guesses) of the day.
Those loads kicked a bit. Accuracy was around 4" at 100 meters, but a mite biting
for shooting off the bench.