ORIGINAL: M.T.
Getting ready to start reloading any info on powder, tech., or advice is welcomed
Sorry, I can't help you with 7mm Reg Mag loads, but I can provide some information for the 243.
My old pet 243 load for everything (goats, pigs and small deer) was a Sierra 85gr HPBT GameKing with 44grs of AR2209 (=H4350). I also triedthe Speer 75gr HP with 46.5grs AR2209 (=H4350) for Kangaroo culling.
The Sierra 85gr GameKing load shot consistently under 1" at 100m. Rifle was a Ruger KM77 MkII All-weather.