- To prevent cross-caliber chambering (i.e. a 35 cal cartridge in a 33 cal chamber).
- To accommodate longer bullet ogive lengths for larger calibers (30cal bullets have longer ogives than 6.5mm bullets do) while staying within 3.340” COAL.
- To provide a respectable neck length for each caliber. The larger the caliber, the more neck length is needed for adequate neck tension.
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