A long throat doesn't hurt accuracy (at least in benchrest terms) as long as it's close to bullet diameter--which prevents the bullet from tilting as it starts down the bore. But if the throat is considerably above bullet diameter, it sure can. The first Ruger No. 1A 7x57 owned, a red-pad obtained in a trade from a friend in the late 1980's, wouldn't shoot any bullet that wasn't seated very close to the lands, and no lead-core bullet under 160 grains would do that. It shot REALLY well with 160 Partitions and RL-22, but the case neck wasn't holding much of the bullet.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
