Speer #14 recommends Accurate 5744 for reduced .243 Win loads. 21-23 grains behind a 90 grain Spitzer SP to get 2105 and 2273 fps, respectively. That's going to be about as fast at 50 yards as a full powder load behind the same bullet would be at 300 yards, so it should take deer at common wooded area ranges. You won't want them trying long range shots in the beginning anyway.
If you feel you need a little more oomph than that, Hodgdon has quite a number of H4895 loads, all of which Hodgdon says can be reduced to as little as 60% of what's listed. You could adjust with that powder until you think the rifle feels about right for them, then check what you are getting with a chronograph.
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Patron Member