Never understood WHY, but the older neighbor that taught me to start hand loading ( mid-70's) used to mload his 44 mag cases with 2.5gr of Bullseye.
Don't remember if I asked why he shot such a light charge..he loaded 240gr.pills. I started loading all my pistol loads w/ Bullseye back when I started loading.
A "new" line of powders came on the market.. Accurate Arms, & I bought some #2, #5, #7, #9. Switched from Bullseye & used #2, as it was much cleaner, worked as well, accuracy-wise. I also started using 2230, 2460, &2520 in my rifle loads. Stuck with A?A for many years & a lot of loading..then I discovered Shooter's World line of powders. I actually like some of their powders better..
Cleanshot is very similar to A/A #2, Blackout is very similar to A/A 1680.
Had some good results with loads using their Match rifle in 308 & 30-06 .
Unfortunately, Shooter's World powders are /have been hard to find, since I discovered I really like them.
should add that I used to buy WWB ammo for the cases, so I'd have some to load. Have plenty of cases now, in all the calibers I own..
Happy to say I won't be buying ANY factory ammo , ...esp. @ current prices.