More recoil with 4F has been noted but not more velocity compared to 3F.
Hellgate posted:
"Get the first edition of the Lyman Blackpowder Handbook (1975) and it gives loads using 4Fg in the C&Bs. There is not much difference in pressure or velocity between 3F & 4F GOEX. For example in the 36 cal '51 Navy with the 81gr .375 ball:
FFFg 14gr=752fps @6900 LUP pressure for 102 ft/lbs energy
FFFg 26gr=1079fps @ 8600 LUP pressure for 209 ft/lbs energy
FFFFg 14grs=884fps @6900 LUP pressure for 140 ft/lbs energy
FFFFg 26grs=1033fps @8820 LUP pressure for 192 ft/lbs energy
LUP= Lead Units of Pressure Copper units of pressure (CUP was inadequate to measure the lower BP breech pressures)
Note that for the lighter charges 4F is better, for the heavier charges it loses steam compared to 3F. Go figure." --->>> SEE POST #2
https://www.thehighroad.org/index.php?threads/4f-vis-a-vie-3f-bp-for-revolver.521361/#post-6471921
Also interesting is a post by orpington:
"I am currently reading The Complete Guide to Handloading, by Philip B. Sharpe. Today, I read Chapter XXVII, 'Obsolete Black Powder and Foreign Cartridges'. In the third to the last paragraph of that chapter, which was written in 1937, Sharpe writes the following:
"If you must use black powder, use the proper size for best results. For heavy rifle cartridges requiring 50 or more grains of powder, use granulation Fg or FFg; for lighter loads use FFFg; for handgun cartridges, FFFFg is practical. Most handgun shooters have trouble chiefly because they use too large a granulation of powder."
Has what was considered FFFFg in 1937, and what is considered FFFFg now changed over the years? If it is identical, it appears we should be using FFFFg powder in revolvers, instead of the more commonly used FFFg. Any thoughts? The author is certainly very credible, so I think he might be correct in his assertion. ?????????" --->>> SEE LAST POST #27
https://www.thehighroad.org/index.p...wder-usage-other-than-flintlock.746331/page-2