There are "limits" on primer protrusion because too much WILL pierce the primer cup. EVERY time a primer is struck, the brass is stretched and "work-hardened". Too much stretch and it will fracture. The high-pressure and temperature gases that leak backwards through such cracks act like tiny plasma cutters and "eat" the tip of the striker. The not-so-smooth striker tip will then be even more effective at puncturing the primer cup. and the consequent gas escapes will attack not just the striker tip, but the circumference of the striker hole. This is why "serious" small arms inspections include close visual examination of these features and careful gauging thereof.. "Burned" strikers are relatively cheap and easy to replace; bolts / breech blocks much less so. Arisakaicon shooters will probably have noticed the rather "casual" relationship between the diameters of striker tips and striker holes, especially in some later-production Type 99s.

Headspace is important, but so are the limits for striker and striker hole dimensions. Primer SEATING DEPTH is also important; check you loading manual. Take care and do not get "adventurous" or "distracted" at the loading bench.
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