I keep it really simple. Most of my Encore and Contender barrels are made by SSK. I use their load data.
On the few regular Encore barrels I use rifle data minus 1 1/2 gr. for safety and less stress on the gun.
My only regular Contender barrel is a .223. I use rifle data for this for the last 41 years.
The only two guns I had problems with was a SSK .45-70 barrel with 3000+ rounds and a stretched frame and a .416 Taylor Encore barrel with a stretched frame from excessive use of AFrames (no longer recommended by SSK due to increased pressures). Both frames were replaced by T/C.