257 Weatherby

The Collapsed Shoulder is in an old Speer manual. Light loads & slow powder are the cause. Use a faster burn rate of powder. Pressure is low & neck not expanding to seal. Make sure the bullets have enough neck tension. Magnum primers must be used. A to long OAL, will not let powder burn correctly

257 Weatherby
243winxb, Aug 7, 2017
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