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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length and Bullet Velocity Ratio
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<blockquote data-quote="Bart B" data-source="post: 805431" data-attributes="member: 5302"><p>Note also that muzzle velocity from a given barrel and components using different powder lots, primer make/model and lot numbers can easily have up to 30 or 40 fps difference for each one. For example, check the muzzle velocity numbers in the following table for the different primers used with a given powder type/charge, case, bullet, case prep and barrel for the .30-06:</p><p></p><p><img src="http://3.bp.blogspot.com/_f1TTfqxVUw4/SxfJ8WU0xiI/AAAAAAAAAwA/1PI1SACs100/s640/Table_1_and_Table_2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>That Lapua bullet used in the above tests coulc be had in two different diameters; .3082" (7.82mm) and .3092" (7.85mm). Which one used is not shown</p><p></p><p>Too bad most published load data does not include all those subtle details about the barrel and components used. No wonder we see a large velocity spread for a given cartridge, bullet and powder combination.</p></blockquote><p></p>
[QUOTE="Bart B, post: 805431, member: 5302"] Note also that muzzle velocity from a given barrel and components using different powder lots, primer make/model and lot numbers can easily have up to 30 or 40 fps difference for each one. For example, check the muzzle velocity numbers in the following table for the different primers used with a given powder type/charge, case, bullet, case prep and barrel for the .30-06: [img]http://3.bp.blogspot.com/_f1TTfqxVUw4/SxfJ8WU0xiI/AAAAAAAAAwA/1PI1SACs100/s640/Table_1_and_Table_2.jpg[/img] That Lapua bullet used in the above tests coulc be had in two different diameters; .3082" (7.82mm) and .3092" (7.85mm). Which one used is not shown Too bad most published load data does not include all those subtle details about the barrel and components used. No wonder we see a large velocity spread for a given cartridge, bullet and powder combination. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length and Bullet Velocity Ratio
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