Originally Posted by bikehe
Getting close to fireforming all my 243 cases and dont want to FL size them. Just want to bump the shoulders .002-.003" and if its possible neck size. Can I buy a bushing neck sizing die and machine the OAL of the die down until I have the adjustment I need to bump the shoulder or am I asking too much. Just dont know if the neck sizing bushing dies can do both in one stroke of the press or whether I have to buy a full length die and machine out the neck and then buy a neck sizing die. Thanks for any info
You're way over thinking this, either neck sizing or FL sizing is not your answer. You need to PARTIAL FL SIZE in a FL SIZING DIE to achieve what you want. If you want to use a FL die with a neck bushing, no mods will be necessary, work out what bushing size you need and adjust your die to give a .002" bump, simple. FYI, if you neck size only, you will eventually have to PARTIAL FL size anyway, as the cases will become tighter to chamber after a few firings.
You WILL need some sort of measuring device to determine how much bump you're giving your cases, guessing isn't good enough. I use either my RCBS Precision Mics or my Hornady headspace set, the Precision mic is more accurate in my experience, but the Hornady LnL gauge works.
Hope this answers your query adequately.