I am planning to install a muzzle brake my 110, 300 win mag and I am just curious what thread size should I go with? I see 5/8-24 is used most often for .30 cal brakes, but one muzzle brake manufacturer in New Zealand suggested I go with a 3/4-24 thread instead of the 5/8-24 if I plan to use the factory Savage heavy barrel. He said it had something to do with how Savage barrels are made and if you use too small diameter thread the bore at the muzzle could open up slightly.
Perhaps something to do with stresses in the barrel being released?

Anyone heard of this being suggested before?

It really doesn't matter to me which thread size I use but I figured if I went with a more common 5/8-24 threaded muzzle brake it would be easier to sell it later on if I didn't like it.

Thanks :)