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Collectors frequently come across .44 and .45 caliber cartridges with a .22 R.F. blank inserted backwards into the nose of a hollow point bullet. The problem is that the target has to be hard enough to detonate the explosive, and usually there is not enough blast ot be effective.
During WW II the Army Ordnance determined that a projectile had to be a minimun of .60 caliber to have an effective explosive charge.
Bob Wright
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