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Hunting
Long Range Hunting & Shooting
300 RUM or 7mm with 180 bergers at 3000 fps
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<blockquote data-quote="Jordan Smith" data-source="post: 755727" data-attributes="member: 44423"><p>Yeah, there are lots of variables that QL factors in, and I just did the default values for most of them, not knowing your actual numbers. That could be part of the reason why there is so much disparity between the two numbers. Assuming an OAL of 3.598", usable case capacity of 99.8gr, and a 26" barrel, it's saying that 93gr of Retumbo should be around 63k psi and 2940fps. Lot to lot variation in the powder also plays a part here, and it's saying that a lot that is 10% faster than average would produce 3041fps. </p><p></p><p>This is also assuming a SAAMI chamber and throat, which you may not have, and your land and groove diameters could vary from what QL assumes, as well. Lots of factors involved, but it serves to give a ballpark. Strain gauge data would be very interesting to compare to what QL is saying.</p></blockquote><p></p>
[QUOTE="Jordan Smith, post: 755727, member: 44423"] Yeah, there are lots of variables that QL factors in, and I just did the default values for most of them, not knowing your actual numbers. That could be part of the reason why there is so much disparity between the two numbers. Assuming an OAL of 3.598", usable case capacity of 99.8gr, and a 26" barrel, it's saying that 93gr of Retumbo should be around 63k psi and 2940fps. Lot to lot variation in the powder also plays a part here, and it's saying that a lot that is 10% faster than average would produce 3041fps. This is also assuming a SAAMI chamber and throat, which you may not have, and your land and groove diameters could vary from what QL assumes, as well. Lots of factors involved, but it serves to give a ballpark. Strain gauge data would be very interesting to compare to what QL is saying. [/QUOTE]
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Long Range Hunting & Shooting
300 RUM or 7mm with 180 bergers at 3000 fps
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