Cowboy crossover loads

You don't need to use Trail Boss. If you are trying to develop a load that will work in the pistol and the rifle, the pistol is the limiting factor. I don't know where you got your 6.9 grain load data from, but it doesn't show on the current Alliant website. If you have that load from a reliable source, and it chronographs around 800-850 fps, you are probably good to go for using that load in the pistol and the same in the rifle.
However, you said it was a Ruger Peacekeeper, which doesn't exist as far as I know. If it is a New Vaquero, then you need to keep your loads within the loading manual limits for .45 Colt (and not for the much stronger Ruger Blackhawk).
In my Ruger New Vaquero I find that 6 grain Red Dot with 250 grain bullet is sufficient. A better load for CAS is a 200 grain bullet with 5 grains of Bullseye. Green Dot will work, but I have no experience or load data for it.
Nothing complicated.

Hmmm, well I don't have a Chronograph, but I do have the 49th ed Lyman book. That's where I got the greendot load, it maxes at 7gr, so I stay a 6.9.

Hey, could I just check the pistol loads there and cross-ref with the rifle loads to make sure it's not over the top? is that sensical?

And yes, it is a Vaquero.
 
Just use the same load in each, remembering to keep the pressure within the range of the revolver.
Also, remember that the rifle will generate more pressure with the same load, because all revolvers lose considerable pressure from leakage at the front of the cylinder. This, combined with the longer barrel will give considerable higher velocity to the rifle.
 
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