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Rifles, Reloading, Optics, Equipment
Reloading
powder charge vrs barrel length
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<blockquote data-quote="g0rd0" data-source="post: 836965" data-attributes="member: 44168"><p>in a way you are correct. But, the proper way to choose powder is by expansion ratio. A bit complicated to understand but here is the short version, case capacity + caliber + barrel length (barrel length is the distance from the base of the seated bullet while in the chamber to the muzzle, not the listed length from the manufacture, this is measured useing a dummy round). Once you know your BL, CC and caliber from a chart or slide rule you can determine your burn rate and that is how choose your powder.</p><p>If what I have just posted sounds greek to you then use your books and publications, always confirm your load, start with the start load, load 5 then load 5 each of .5 grain incraments untill you get to the max load. go to your range and at 100 yards from the start load fire your 5 shots, (dont worry if the sights are a little off you are interested in groups at this point) take note of the size of the group and signs of preasure. Then do the same for the next incrament and the next ect. untill you notice the tightest group. You then have the most efficiant load combo of that powder and bullet for that rifle.</p><p>The books list 150 grain bullet in a 7mm rem mag useing IMR7828 SS, 63.4grn max 68.7 the vel 2851 to 3100fps. In my savage the tightest group is at 67.0 grns chrono at 3010fps so that is where I keep it.</p></blockquote><p></p>
[QUOTE="g0rd0, post: 836965, member: 44168"] in a way you are correct. But, the proper way to choose powder is by expansion ratio. A bit complicated to understand but here is the short version, case capacity + caliber + barrel length (barrel length is the distance from the base of the seated bullet while in the chamber to the muzzle, not the listed length from the manufacture, this is measured useing a dummy round). Once you know your BL, CC and caliber from a chart or slide rule you can determine your burn rate and that is how choose your powder. If what I have just posted sounds greek to you then use your books and publications, always confirm your load, start with the start load, load 5 then load 5 each of .5 grain incraments untill you get to the max load. go to your range and at 100 yards from the start load fire your 5 shots, (dont worry if the sights are a little off you are interested in groups at this point) take note of the size of the group and signs of preasure. Then do the same for the next incrament and the next ect. untill you notice the tightest group. You then have the most efficiant load combo of that powder and bullet for that rifle. The books list 150 grain bullet in a 7mm rem mag useing IMR7828 SS, 63.4grn max 68.7 the vel 2851 to 3100fps. In my savage the tightest group is at 67.0 grns chrono at 3010fps so that is where I keep it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
powder charge vrs barrel length
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