My all purpose deer gun is a sako 308 full stock carbine with 3-9 zeiss scope,
but I love full stocks.
For brush though and 100 yards, I'd go with a Marlin 44mag, 444 or 45-70 guide guns, levers are good in brush. Depending on where I am hunting I take a winchester 1300 w/slug barrel or my remington 788 in .44 mag. The winchester and remington take a beating in the brush up here where 50 yard shots are rare, this is thick brush with poke your eyes out undergrowth. Both the 12ga slug or the .44 tend to knock them ass over teakettle, though the .44mags are loaded a bit hot but then the 788 has NINE locking lugs, those rounds match the old Norma carbine loads so they are almost 1950fps vs the 1600 factory loadings that are made more for handguns than rifles.
The .270 is an easy 500 yard round, similar to the 243 but bigger bullet. I know a few who use them for Elk up round Montana and those states.