Any advice to help me get a solid conclusion with this would be greatly appreciated this is for reloading my R&D Conversion Cylinder and It states anything up to 850 FPS and anything up to 1000 PSI will work however it does not mentioned no certain Bullet so I guess the recipe would decide that.
Perhaps someone will back me up here. This is my opinion. Don't be offended, it is well intended, and you're asking questions, which is a great thing.
Get the right powder. Use a lead bullet.
Red Dot is a fast powder, and not one I'd consider particularly forgiving. You'll put a small amount in that large 45 Colt case. You can make it work, but you'll likely have to take your finger off the trigger, and point the barrel to the sky, to get the powder by the primer, then aim, between each shot, to get consistent ignition and accuracy. (OK, I'm a pessimist.)
I'd hold off until you get trail boss, unique, AA#5, or HS6 to be SURE you don't have a double charge (they'll take more space in that big case), as a new reloader, and stay well within a cowboy action load for the R&D conversion.
Use a lead bullet, for a lighter load will get it moving down the barrel, and keep pressure down.
Don't be in a hurry to create a load with the only powder you can find. Shoot something else until you can find the right components.
You want to be safe, and have a decent load, that shoots well, and bank some success as a handloader.
Ideally, I'd hold off, until you get:
250 Gr / 255 Gr RNFP lead bullets
And use :
8.0 gr or just under of Unique or
10.5 gr or just under of AA#5
Those are the most 'classic' loads you'll likely find for 45 Colt Cowboy loads.