Re: Sheep rifle after 2 shoulder surgeries this year?
I took my .308 with 150 AccuBonds on my Dall hunt. I used the exact same scope you have on it but put on some CDS turrets. I found the turrets to be a wise investment.
The good news is that the bullets today are well-constructed and will penetrate/expand to get the job done. You don't need a big azz kicker rifle that most guys believe will make them successful. I see that Nosler makes a 90 grain AccuBond for the .243. I wouldn't hesitate going that route. Put the bullet where it needs to be and you have a dead sheep.
I will tell you to consult the Nosler reloading manual for the .243. The load that worked for my .308's 150s and 200s was the exact recipe in the book. It's a good starting point if you are going to make your own loads.
Don't forget to factor-in the wind. The lighter bullet will drift more in a crosswind. It could make a big difference at 300. Practice, practice, practice.