Well, now for a word from the really low end of the spectrum. My Gold Cups have been thriving for over 35 years on 4.0 to 4.2 gr. of Bullseye with a 200 gr. bullet. This bullet used to be the Lyman 452488, but I now use Dillons. The guns don't seem to mind.
You should be aware that this load only generates about 8,000 lup, so using a ten (10) pound recoil spring, and reduced power magazine springs is essential for totally reliable function. Needless to say, a return to normal power springs is absolutely necessary before firing more powerful loads.
The 200 gr. LSWC does not require all that much power to penetrate one layer of paper, and one of cardboard. Walt