Quote:
Originally Posted by ken1989
Win 43's hornets require .223" diameter bullets. I suspect this is the case for the 218 Bees as well. This is likely the cause for your higher pressures.
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Yes, most 22 hornets and 218 bee's and many other similar small cartridges manufactured up until WW2 were made with .223 diameter barrels. That could easily explain the pressure excursions. Speer and others used to make bullets specifically for these undersized bores and didn't recommend using .224" bullets in them. In fact Hornady made a bullet called the 40 grain Jet specifically for those old rifles but even smaller @ .222" diameter.