robhic What is your intended use and caliber(s) to be covered?
Your TightGroup is close enough to the Bullseye and AA#2 speed to make them redundant.
HS-6 and Power Pistol are close enough to make PP redundant.
AA#7 is slower than the rest so if not quite full magnum
. . . ^^ Outstanding!! ^^
That said, each and every one has their own personality and can do at least one thing better than the others.
Bullseye is the undisputed (okay, maybe somewhat disputed, these days) champion of consistent burns in low pressure applications (like 38 Special target).
AA#2 is the best metering prowder - bar none. It's nice and fluffy and so it has a great fill rate. It runs super clean and makes a good amount of gas - perfect for 9mm range shooters with 115 grain bullets.
TiteGroup is very economical and runs clean in most any range shooter application. Really hard to beat with plated bullets.
HS-6 is an excellent propellant for beginner loaders. Its low energy content grants a lot of forgiveness with load work ups. Although not known for its clean burn or versatility, it can make some great ammo with heavy bullets, turned up near the top of the published scale - were it indeed burns quite clean.
Power Pistol makes bullets go fast. It's high energy content (just the opposite of HS-6) is capable of making some exhilarating ammo - especially in semi-auto applications. Defense level stuff.
AA#7, although not a full-magnum propellant, makes awesome full-power semi-auto ammo; especially with heavy bullets. Can't be beat in 9mm (or 357 Sig) with 147's. 10mm Auto with 180 grain bullets are truly impressive too - with 95% the performance, and far less flash and recoil than AA#9 - a much more usable, "balanced" round. AA#7 is quite possibly the must under-rated "big" propellant.
I have and use all the mentioned propellants - and many more. And right now, I'm in the process of paring down my inventory (the number of different propellants; not the total quantity). Of all the propellants mentioned here, Power Pistol is the only one I intend to purchase in the future. Which makes this post somewhat ironic
.