Gonna relay some of my experience with the 243, then head down a different rabbit trail... I've hunted with a 243 for 30 years this year, killed probably close to that many deer with 1 as well. Rem 700 bdl 1:9.25 twist & 100 gr bullets to start.
Now its a beretta brx1 1:8 twist 20" pipe. Slick, accurate, nice rifle, but about $1,500. Doesn't like 75 gr vmax, loves 85 game kings though.
As for a new shooter, get an upper for an ar15 in 6 arc or 6.5 grendel. Put it on a nice collapsible stock m4 lower. They fit small shooters nicely, if you have a semi auto restriction look at doing a bear creek side charger with the gas tube removed, gas block reversed. Turns them into a spring assist bolt action. Just built 1 in 6.5 grendel, have 550 in a custom trigger, stainless barrel, well set up rig. And it shoots dimes.