Howdy, 1961MJS !!
Your Bullseye & Titegroup will do fine. So will the Trail Boss. Since you didn't mention the caliber, but DID mention both 200 gr. AND 250 gr. projectiles, I'll assume that your caliber is 45 Colt. Many prefer the Trail Boss for its' ability to fill more of the very large cases used for many of the 44 & 45 calibers used in our fun sport. I have use both B/E and T/G and there is a LOT of empty case there even after a full-power charge is in the case. It CAN be easy to miss and not see if a case sneaks by your attention (for example, when someone calls or some other distraction) without powder, and later causes an VERY unsafe condition; ie. a "squib" load as it's often called. (To others: let's NOT get into the semantics ... right or wrong, a "squib" is most often what the condition is called.)"
Personally, I LIKE Titegroup - it has a great sound that, surprisingly, is a bit different than other smokeyless (MY term) powders, and it is both accurate and economical.
When loading with smokeyless powder (I'm primarily a BP fan) many of us have found that loading 45 Colt with the heaviest bullets propelled by the highest SAFE, published loads, and crimping firmly will allow the case to expand and seal the chamber a bit better than
ANY light loads. This keeps your chamber(s) cleaner and keeps less residue to blow back into the workings of those rifles. Others may disagree but these hints have helped MANY to get the best performance from their old style rifles.
You CAN use 45 Colt RNFP (round nose, flat point bullets) in all the rifles you mentioned AND your SAA. If your projectiles are TRUE round nose, then I would caution
against their use in any tubular magazine firearm. The recoil CAN cause bullets in the tube to jolt & jump and the nose of one bullet cause the primer to go off on the cartridge above (after) it in the tube. This happens a LOT more if pointed bullets are used. (which is why Hornady came out with their "Lever Evolution" premium hunting ammo that has a soft polymer tip that WILL work in tubular magazine rifles ... primarily lever actions.) It CAN happen if using the wrong type of ammo that uses the wrong type of projectile.
You COULD do BP, but I understand about the smell. My family is used to the smell, but they DO complain occasionally. I usually wait until they're going out for a couple hours to do my "dirty work." And the sheer FUN of shooting BP from these old style firearms can't be beat!!! Don't listen to ANYONE who says it's harder to use and clean BP - they simply don't know what they are talking about. HOWEVER, BP cleaning (and shooting) is MUCH dirtier and does smell ... to some. And you can't "put off" cleaning after firing for very long. To get my own guns to the same level of cleanliness as I get them after firing nitro powders, it take less than
one third the time, and there is NEVER any real scrubbing. Just hot water and/or "moosemilk" to clean & stop the residue from doing nastiness like attracting moisture. Then, it's ready for re-oiling and done! (Moosemilk is a concoction many of us use that consists of one part Ballistol [a high-quality mineral oil] to 5 to 10 parts water. And it looks like milk -
while smelling a bit like old socks, IMHO! The water stops the corrosive properties of the BP residue, and the Ballistol forms a light coating of oil which keeps rust from starting immediately. Then some high quality oil &/or grease for the best lubrication & preservation, and as I said ... DONE!)
With a thorough application of Febreeze or Lysol (or similar) the smell goes away quickly ... at least to MY nose it does ...