Wrong. Give them a call. And, yes the modern calculations trump the old well mine did this and his did that. As your experience grows you will learn this. That is what experience will do for you.
If you are trying to be sure.. use the Many, Many calculators out there. These calculations prevent the professional barrel buyer from a "one of" rifle". If you use the calculators you will never have to fuss. Any good bullet that works in the math will work in the field. No more I hope it will shoot well. I have heard and seen and shot plenty of "one of" rifles. Usualy the groups proclaimed are amazing data less claims.
Use the modern info not "hey I heard that" crap.