Lyman makes a good mold for a 300 gr cast bullet in the 405. Mine casts them 292 gr from wheel weights. Mold is pricey, but high quality.
I use Sierra 210 gr SJHP (semi jacketed hollow points) with 25 gr of AA5744 as a "grouse load" in my Ruger #1. Fun to shoot for the ladies in the house as well. Don't know about feed issues with the model 95, but the lead bullet has a pretty nice round nose to it. The pistol bullets will be short enough to feed well anyway, I think.
Best wishes, and good shooting.