Mat said:As for neck sizing: I wouldn't recommend it for any situation where you don't want sticky chambering. Likewise, make sure you don't seat the bullets such that they are touching the barrel, the last thing you want is to unload a round and leave the bullet in the barrel (and dump powder everywhere).
I can't agree with you on a couple of points, neck sized is no more difficult to chamber than a full length sized one. If you bear in mind that when a round is fired what happens is that the brass case is expanded as far as the chamber wall, then the natural elasticity of the brass causes it to contract by a very small amount, which leaves you with a case that is tailored to your chamber, which will fit it every time more precisely than a full length re-sized one. It will stretch lengthwise as all cases will, but this is dealt with when the case is trimmed to length during the case preparation.
As for neck tension affecting how long you load the round, I cannot agree with that at all. If you have loaded the round so long that it requires extra effort to close the bolt, then it is too long.
The accepted wisdom, as you correctly pointed out, is to load between 10 and 30 thou short of the lands. You can load with the head touching the lands, to avoid this small jump, if you are chasing extreme accuracy and you think this is the way to do it, but, you would have to develop the load to suit otherwise, as you have stated you would cause an increase in pressure. This being brought on by outside influences, touching the lands, as opposed to too much powder. I would suggest that if you are using a round that is difficult to chamber because it is too long, unless it has been developed at this length, that you do not use it.
As for your Remmy with the long throat, I can't see why you could not neck size. Surely the reamer would have only been long in the throat, and the case would not have expanded any more than usual beyond the shoulder of the cartridge. If you are saying that the case up to the neck expanded unequally then that is indeed baffling, well to me anyway. As the head-space measurement is actually taken from a datum on the shoulder of the case, did you have the head-space of your weapon checked?