Originally Posted by RT2506
I run my cases through a FL sizer then trim them all to the min length. Then I remove the inside the case flash hole burr and then use the primer pocket square too to make sure everything is square. Like has been said neck turning for a standard chamber is not necessary unless you have a bad batch of cases that have really bad thick and thin spots in the neck. I then load them and shoot them. Then I part size the case just bumping the shoulder with a FL die for my hunting ammo. I have found that this usually gives me better accuracy over the new cases.
I'll second this motion and vote for it too.
With rimless bottleneck cases, they've typically shot the most accurate using full lenght sizing dies set to bump the shoulder back no more than a couple thousandths. This reduces body diameters about the same. If you use a bushing die such as one from Redding or RCBS, you won't need one of those neck-bending balls to up size the case neck; just use one about 2 to 4 thousandths smaller than a loaded round's neck diameter. Tighter/smaller one for more grip, looser/larger ones for less grip on the bullet. The case neck expands about half as much as it gets sized down in the bushing die.
Sierra Bullets resizes their cases of this type this way to test their products for qualtiy. Been doing it since the 1950's and nobody shoot's 'em as accurate as they do in their rail guns using standard SAAMI chambers.