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.284" Diameter Bullet does NOT equal 7mm
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<blockquote data-quote="DMP25-06" data-source="post: 2430112" data-attributes="member: 27271"><p>I have some questions about the measured diameter of bullets .</p><p></p><p></p><p>Why is a .284" diameter bullet referred to as being "7 millimeter" , when 7 millimeters = .275590"</p><p></p><p>1 Meter = 39.37007874..." , divided by 1000 (each Meter = 1000 Millimeters) = .039370" (rounding back to 6 decimal places)</p><p></p><p>Therefore , converting Millimeters to inches :</p><p>7mm = .275590" ----- But , bullets labeled as 7mm are actually .284" diameter</p><p>6.5mm = .255905" ---- bullets labeled as 6.5mm are actually .264" diameter</p><p>6mm = .236220" ----- bullets labeled as 6mm are actually .243" diameter</p><p>8mm = .314960" ----- bullets labeled as 8mm are actually .323" diameter</p><p>10mm = .393700" ----- bullets labeled as 10mm are actually .400" diameter</p><p></p><p>When a barrel is drilled , the diameter of the drilling is always smaller than the final diameter of the bore after the rifling grooves have been cut , and that distance across the grooves is equal to the bullets's diameter , whether it is .284" , .264" , .243" , .323" , or .400" , and others .</p><p>The raised surfaces of the barrel lands is the diameter of the drilling before the rifling grooves are formed , whether by button-cut , single point-cut , or other methods .</p><p></p><p>My question is : How did we arrive at these Metric designations when the bullet's actual diameter , measured in inches , does NOT convert to those metric values ????</p><p></p><p>I am curious as to what the answer might be .</p><p></p><p></p><p>DMP25-06</p></blockquote><p></p>
[QUOTE="DMP25-06, post: 2430112, member: 27271"] I have some questions about the measured diameter of bullets . Why is a .284" diameter bullet referred to as being "7 millimeter" , when 7 millimeters = .275590" 1 Meter = 39.37007874..." , divided by 1000 (each Meter = 1000 Millimeters) = .039370" (rounding back to 6 decimal places) Therefore , converting Millimeters to inches : 7mm = .275590" ----- But , bullets labeled as 7mm are actually .284" diameter 6.5mm = .255905" ---- bullets labeled as 6.5mm are actually .264" diameter 6mm = .236220" ----- bullets labeled as 6mm are actually .243" diameter 8mm = .314960" ----- bullets labeled as 8mm are actually .323" diameter 10mm = .393700" ----- bullets labeled as 10mm are actually .400" diameter When a barrel is drilled , the diameter of the drilling is always smaller than the final diameter of the bore after the rifling grooves have been cut , and that distance across the grooves is equal to the bullets's diameter , whether it is .284" , .264" , .243" , .323" , or .400" , and others . The raised surfaces of the barrel lands is the diameter of the drilling before the rifling grooves are formed , whether by button-cut , single point-cut , or other methods . My question is : How did we arrive at these Metric designations when the bullet's actual diameter , measured in inches , does NOT convert to those metric values ???? I am curious as to what the answer might be . DMP25-06 [/QUOTE]
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.284" Diameter Bullet does NOT equal 7mm
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