I wanted to try and figure out a mathematical formula for converting 3f powder loads to 2f
For example
Goex 3f 90grs= ?? grs Goex 2f
This might be a handy formula for us to work out, so that way people can maximize the powder usage (or minimize it, depending on their viewpoint).
Post away

Campo

If you were able to create this formula somehow you would need to factor in length of the barrel and ignition type also. One of these effects how quick the pressure builds and the other how long it lasts.

Shooting 100 grains t7-2f from my 24" remington and 100 grains of 3f I really do not see much of a difference in velocities across the chrono - on the other hand shooting 90 grains of 2f in my hawkin and 90 grains 3f in the same gun - lots of difference in velocity, kick, and POI - I have reduced the 3f to 80 grains in the Hawkin (28" barrel).

From what I understand and have read many times on these forums is if you are using 2F and want to switch to 3F drop the grains by 15% to 20%.

I recently switched from using 100 grains of Pyrodex RS (2F) to 85 grains of Pyrodex P (3F). It seems like it is more accurate and a bit "cleaner". Clean is a relative term in black powder shooting.

Hope this helps.

Industry standard is to reduce 2F load data by 10-15% when using 3F...ie: an 85grn charge of Goex 3F would be 100grns of 2F.

Industry standard is to reduce 2F load data by 10-15% when using 3F...ie: an 85grn charge of Goex 3F would be 100grns of 2F.
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I would also second that. 10-15% reduction when using 2FG loading data and 3FG powders.

Tahquamenon