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Rifles, Reloading, Optics, Equipment
Reloading
Confusion...
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<blockquote data-quote="rscott5028" data-source="post: 541467" data-attributes="member: 24624"><p>Here are some thoughts to consider... </p><p> </p><p>Each barrel/chamber is different. If 2 barrels are chambered by the same smith with the same reamer to the same specs, the chambers may be very close and able to use each other's neck-sized brass. </p><p> </p><p>You didn't mention how precisely you set your headspace on each rifle and if that was the same or even if the same reamer was used. </p><p> </p><p>It sounds like there's a definite difference between the throats and/or headspace in your 2 rifles. ...perhaps even tooling marks. It might be interesting to have a look with a borescope. But, that's not going to change anything. </p><p> </p><p>Nonetheless, the barrels will often have subtle differences that often amount to more than the 20fps differences that you're seeing. Both velocity and accuracy may differ. </p><p> </p><p>Also, barrels will see changes in velocity during some arbitrary break-in period. And, they may not settle down at exactly the same rate. </p><p> </p><p>As time goes on, the throats will errode at slightly different rates. </p><p> </p><p>Velocity is a function of many factors, some of which you have already pointed out. </p><p> </p><p>I don't have statistics to make a solid claim. But, I personally prefer my twice-fired brass because it's been through my whole process, and doesn't yet require full length resizing or annealing. </p><p> </p><p>I don't think you can draw any final conclusions until you've shot 100-200 rounds. </p><p> </p><p>In any case, I don't see any reason to be overly concerned by your experiences thus far. </p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 541467, member: 24624"] Here are some thoughts to consider... Each barrel/chamber is different. If 2 barrels are chambered by the same smith with the same reamer to the same specs, the chambers may be very close and able to use each other's neck-sized brass. You didn't mention how precisely you set your headspace on each rifle and if that was the same or even if the same reamer was used. It sounds like there's a definite difference between the throats and/or headspace in your 2 rifles. ...perhaps even tooling marks. It might be interesting to have a look with a borescope. But, that's not going to change anything. Nonetheless, the barrels will often have subtle differences that often amount to more than the 20fps differences that you're seeing. Both velocity and accuracy may differ. Also, barrels will see changes in velocity during some arbitrary break-in period. And, they may not settle down at exactly the same rate. As time goes on, the throats will errode at slightly different rates. Velocity is a function of many factors, some of which you have already pointed out. I don't have statistics to make a solid claim. But, I personally prefer my twice-fired brass because it's been through my whole process, and doesn't yet require full length resizing or annealing. I don't think you can draw any final conclusions until you've shot 100-200 rounds. In any case, I don't see any reason to be overly concerned by your experiences thus far. -- richard [/QUOTE]
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Reloading
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