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"I’m thinking there is a good possibility I may neck size as opposed to full length sizing."
I suggest you don't. Neck sizing isn't nearly as helpful for anything as some think. For many factory rifles it does no good at all for accuracy and for some it's not as good as FL sizing, nor is necking any automatic aid for extending case life. Most of the hyped claims you read about neck sizing are people parroting "conventional wisdom" to sound wise but without a real clue of what they're saying.
Both of your new cartridges are bottle neck. Forget the belt and FL size so the shoulder is at the same or slightly less position than the fired location for both, that's all they will need. Your fired cases have already shrunk back a thou or two from max chamber size so any further set-back simply increases the amount of case stretching and does so for no benefit at all.
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