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When I did my 30-06 AI,I found out there is a specific headspace gauge for the AI.
Remember,when you fireform,you want the case head snug against the bolt face or you will get stretch rings.
Initially,with non-AI brass,you only have a circle/line contact brass to chamber at the junction of the neck and the shoulder.
One thing for sure! Both the CZ and the Springfield are controlled round feed. You do not want to single load into the chamber and force the extractor to snap over the rim.That places way too much load on the limited headspace feature you have on the brass.It will crush back.
You must load to the mag box,and let the round feed up under the extractor.
FWIW,in my .257,I use the 115 gr Ballistic tip for everything,though there is a Berger I have not tried.
You may have different results with the larger 06 case,but the powder I use in the .257 AI is H4831 SC.
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