I think the very late war 99,s are what made the reloading manuals go with low pressure loads. PO ACKLY said that the 99 Japanese rifles were very hard to blow up,and stood up to 98 mausers and springfields in the blow up tests he did. I have sectioned unfired 7.7-8x57- 308-3006 cases and they all were very close and you needed a 8x lupe to see and difference in them. there were reasons the mk-3-4,s had big chambers, they wanted the rifles to work with cruddy ammo if needed, with no thoughts about reloading.
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