Captchee, my rifle shoots it's best group at 90gr 2f, so if I switch to 3f, I'll start off at 70 grs then and work my way up. I'll get my best group and then shoot that load through the chrony to see what is doing.
Thanks, 
Jeff
Yes in theory you should see your accuracy with 3 F in the 70-80 grain charge .
Couple things to remember here though .
While F. FF , FFF and FFFF are all ground from the same amount of powder , the finer the grain gets the faster it burns IE there is more surface area .
The other thing is that with a faster burn , you get a quicker/ steeper pressure spike which results in higher breech pressures .
Thus it will take some fine tuning of your 3F charge to get the same MV that you see with 2F . most like you will never get it exact but just a little less or a little more .
You may also find out your rifle simply doesn’t like 3F and no mater what you do you cant get the same accuracy as you find with 2F . The other side is also true . You may find with 3f you get improved accuracy . There is simply no way of knowing without trying different set ups
So keep in mind every component plays a part in the end result .
Muzzleloading isn’t like center fire when it comes to the charts no mater how much we want it to be .
that’s what you are seeing here .
When reloading cartridges you have a table that tells you basically what combinations are safe within a given rifle . You go down the chart and it will tell you if you use X primer , X brand of powder , X amount of powder with X bullet , seated to X depth you will get X velocities .
“I know there is more to it guys but this is simplified “
However with muzzleloading this doesn’t always hold true because there are so many variables
Any difference in barrel length , bore , type or quality of rifling , patch , patch material , Patch Lube or any combination of the above will change your result .
As the poster above mentioned , using wasp nests . I to have seen through the chronograph an increase on MV of up to 300FPS by adding wasp nest to my load before the PRB . But again results may very depending again any differences in the above list
Thus to often when we look at the charts of ballistic formulas our end result does not match even when we think they must .
Now im not saying don’t use the charts and ballistics formulas . They are a good staring point however they should never take the place of actual shooting for that’s the only way you will ever know really what your rifle is doing at different ranges with different load combinations
