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Rifles, Reloading, Optics, Equipment
Reloading
Shot string velocity.
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<blockquote data-quote="elkfirst" data-source="post: 82608" data-attributes="member: 3923"><p>I've just added a chronograph to my reloading equipment (Chrony F1). When I go to the range with a clean barrel and fire a couple or three fouling shots, I notice that the velocity steadily increases from the first shot on to about the fourth or so. It then settles somewhat close to my expected velocity based on the charts (usually a bit less). My theory is that this is caused by thermal expansion of the barrel. As it warms up, the bore gets bigger and offers less resistance to the bullet. Is my thinking correct or am I out to lunch? Having this chronograph sure opens up a whole new perspective. /ubbthreads/images/graemlins/crazy.gif</p></blockquote><p></p>
[QUOTE="elkfirst, post: 82608, member: 3923"] I've just added a chronograph to my reloading equipment (Chrony F1). When I go to the range with a clean barrel and fire a couple or three fouling shots, I notice that the velocity steadily increases from the first shot on to about the fourth or so. It then settles somewhat close to my expected velocity based on the charts (usually a bit less). My theory is that this is caused by thermal expansion of the barrel. As it warms up, the bore gets bigger and offers less resistance to the bullet. Is my thinking correct or am I out to lunch? Having this chronograph sure opens up a whole new perspective. [img]/ubbthreads/images/graemlins/crazy.gif[/img] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Shot string velocity.
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