RE: .243 For Deer Hunting !
I've used a .243 since 1980...killed at least 130 deer with...My favorite factory loadings inside 200 yards are the Hornady 100 gr Interlock in either Custom or Mag loading, the Remington 100 gr CoreLokt, the Federal Premium 100 gr Nosler Partition and the 100 gr Sierra GameKing BTSP....I would use either of these that group the best in your rifle...I have killed several deer with all the above loadings...
Instead of using a ballistic tip in the .243 the Federal Premium 85gr Sierra GameKing BTHP is a better choice...higher velocity so its flatter shooting and it penetrates better than the Winchester ballistic tips (and some soft points)...I use this as my long range "bean field" loading...But, its not really needed inside 200 yards...Good Luck...
nchawkeye