RE: 300 wsm to far away from lands to be accurate?
Here is some interesting reading on the 300WSM. This is a quote from
Factors In Accuracy, Part II: Handloads
by John Barsness
The throat of the .300 Winchester Short Magnum (and the other WSM's) is interesting, mostly because it doesn't exist.The rifling starts right in front of the chamber's neck, which not only keeps overall length of cartridges short enough to fit in a 3.05" magazine, but eliminates any worry about inaccuracy resulting from "bullet jump."This non-existent throat is one reason factory-model WSM's of any caliber tend to shoot very well.(It's also why chambering a WSM in a longer action is mostly a waste of time.A local gunsmith has already built several .300 WSM's on Mauser and other longer-magazine actions, because the boys want to "seat the bullet out to the lands."But they won't be able to seat bullets out any farther, because the non-throat won't let 'em.If you want to use a longer action, why not use the .300 Winchester "Long?"It achieves the same ballistics, or slightly better, and despite what you've read, doesn't kick any harder than the .300 WSM.)