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The Over-Rated Crown
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<blockquote data-quote="jsnell" data-source="post: 1097362" data-attributes="member: 91124"><p>I realize this discussion is a couple of years out of date (its 2 years later now), but I couldn't leave well enough alone. Didn't anyone notice that all the damage done to the crown that failed to destroy accuracy was of a negative nature - that material was removed, whereas all of the positive damage (the punch that left a pin sticking into the bullet path did destroy accuracy until the bullet passage (shot 3 if I remember correctly) had removed the intrusion, at which point accuracy was restored. Here's what I've come away with - anything that changes the bore shape to out-of-round, anything that changes the bore line significantly i.e. bending, and anything that creates an impediment to bullet travel (copper fouling and deformed barrel material) will cause deterioration to accuracy. Things that remove bore material but don't interfere with bullet travel probably don't make a whole lot of difference. When we get to crown shapes, and uniform bullet release I believe the difference between a perfect crown and a negatively damaged crown is marginal. The escaping, overtaking gas has little effect on the bullet once it is out of the barrel because the gas pressure will dissipate toward the open directions and will not created significant force toward the bullet, with the exception of the jet of gas directly impacting the base of the bullet, which might add a small amount of velocity.</p></blockquote><p></p>
[QUOTE="jsnell, post: 1097362, member: 91124"] I realize this discussion is a couple of years out of date (its 2 years later now), but I couldn't leave well enough alone. Didn't anyone notice that all the damage done to the crown that failed to destroy accuracy was of a negative nature - that material was removed, whereas all of the positive damage (the punch that left a pin sticking into the bullet path did destroy accuracy until the bullet passage (shot 3 if I remember correctly) had removed the intrusion, at which point accuracy was restored. Here's what I've come away with - anything that changes the bore shape to out-of-round, anything that changes the bore line significantly i.e. bending, and anything that creates an impediment to bullet travel (copper fouling and deformed barrel material) will cause deterioration to accuracy. Things that remove bore material but don't interfere with bullet travel probably don't make a whole lot of difference. When we get to crown shapes, and uniform bullet release I believe the difference between a perfect crown and a negatively damaged crown is marginal. The escaping, overtaking gas has little effect on the bullet once it is out of the barrel because the gas pressure will dissipate toward the open directions and will not created significant force toward the bullet, with the exception of the jet of gas directly impacting the base of the bullet, which might add a small amount of velocity. [/QUOTE]
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The Over-Rated Crown
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