I just finished working up a load for a new Tikka T3x Superlite in 243 Win I bought last month. Since I have several 22 caliber varmint rifles including my favorite, the 220 Swift, for this new rifle I opted to load 80 gr Barnes TTSX bullets in it.
My personal opinion is that the 243 Win and this bullet would be a great truck gun. Plus, if you wanted to shoot a lighter bullet, you can shoot a 55 gr bullet at 4000 fps in the 243 Win.