Re: Throat + jump?
for me personally, the first rounds i put out of a barrel, which are the break in rounds, i have the bullets at least .050 off the lands with a very low charge of powder. i don't care what cartridge it is. as you break the barrel in you get a feel for the pressure in your gun and slowly walk the powder charge up.
as far as a big jump being "needed" that is just not the case. what i have heard a couple very experienced 338 shooters tell me is that not only will i get better accuracy, but my spreads will be lower jumping the bullet a little. with my gun that seems to be the case. i load mine about .050 off the lands.