I have been reloading 45 LC and 45ACP, also 9mm Luger. No bottleneck cartridges. I want to reload for my Marlin 336/30-30. I know that full length resizing assures a factory spec cartridge. I need to know if it is oki to neck-only resize if I am only going to use the ammo in this one rifle. I don't know for sure if the cartridges HAVE to be full length rezized or if the shgells will chamber properly if I only neck resize. (I know I can load one and try it but I just need a general rule of thumb here. One way or tother I am going to cook up my loads at home. I used to load for a 270 and a 222 but those were bolt guns.