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Rifles, Reloading, Optics, Equipment
7mm STW
Starting loads are a good thing
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<blockquote data-quote="MudRunner2005" data-source="post: 1217501" data-attributes="member: 12995"><p>Tighter spec'd chambers don't allow the brass to expand as much as most sloppy factory chambers. So sometimes they achieve the higher pressures at lower load volumes. Which in turn means you will equal higher velocities at lower load charges than your average SAAMI spec chamber.</p><p></p><p>Also, I've never used HBN coating, but I have use Moly bullets, and those did produce slightly higher velocities once you got a few down the bore and got some Moly in the rifling. So, I'm sure the HBN coating helped a little bit, as well.</p><p></p><p>Also, 5R barrels seem to be a bit faster from my experiences, and they also clean easier and last a bit longer between cleanings. I think this has to do with the design of the rifling and the fact that being an odd-number of grooves there is no pinch-point that is created because where there is pressure from a land on one side of the bullet, directly adjacent there is a groove.</p></blockquote><p></p>
[QUOTE="MudRunner2005, post: 1217501, member: 12995"] Tighter spec'd chambers don't allow the brass to expand as much as most sloppy factory chambers. So sometimes they achieve the higher pressures at lower load volumes. Which in turn means you will equal higher velocities at lower load charges than your average SAAMI spec chamber. Also, I've never used HBN coating, but I have use Moly bullets, and those did produce slightly higher velocities once you got a few down the bore and got some Moly in the rifling. So, I'm sure the HBN coating helped a little bit, as well. Also, 5R barrels seem to be a bit faster from my experiences, and they also clean easier and last a bit longer between cleanings. I think this has to do with the design of the rifling and the fact that being an odd-number of grooves there is no pinch-point that is created because where there is pressure from a land on one side of the bullet, directly adjacent there is a groove. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
Starting loads are a good thing
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