2F Black Powder Loads in a 40 cal Bench Rifle

[CKing]

If what I am about to ask has been discussed before please advise me where to find it.
I have a 15/16"- 38" L. 40 cal barrel in a half stock rifle that is for table shooting. Twist is 1-48.
Has anyone done any 2F loading for a 40 cal and possibly chronographed any velocities for the loads.
I'm can't seem to find any published data for a 40 using 2F as all the charts I have found so far are based on 3F.
So far 2F Swiss and 2F Olde Enysford have grouped very well.
I look forward to reading any responses.

CKing

[Standing Bear]

In a 66 twist 42" barrel offhand rifle I use 50 gr FFg At 25 and 50 yds. 75 gr at 100. Fixed sights. 75 groad chronographed will  2150 fps
TC

[Daryl]

My .40, with slippery lube, required 75gr. 2F to match accuracy of 65gr. 3F, both GOEX and both loads produced 2,240 to 2,260fps.

With water based lubes I was able to use 55 to 60gr. 2F which ran 1,750fps., approx.

These were all good for 1/2" 5 shot groups at 50 yards off the bench.