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Rifles, Reloading, Optics, Equipment
Reloading
6.5X55 95 VMAX/RL-17 LOAD DEV
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<blockquote data-quote="benchracer" data-source="post: 1344900" data-attributes="member: 22069"><p>The next step was to do a MIN-MAX runup to find my pressure limit and start to map powder charge vs velocity. The seating depth loads @ 45.0 grains of RL-17 were, indeed, VERY mild. I decided to skip the max listed charge of 46.0 grains and begin my testing @ 47.0 grains. I loaded five rounds, in one grain increments, from 47.0 to 51.0 grains. I encountered no pressure signs, of any kind, during my testing. However, Lapua brass is tough stuff that tends to resist showing pressure signs. When using softer brass in other chamberings (such as Winchester, PRVI, or Norma), I have consistently noted pressure signs at velocities corresponding to QL predictions of 63k-65k psi. Though the top load of 51.0 grains showed no pressure signs, and still felt like a mild load, I am treating it as max. Here are the results of the MIN-MAX runup:</p><p></p><p>Mark X Mauser</p><p>6.5x55</p><p>Shilen #4 contour barrel, 1:9 twist, 26"</p><p></p><p><u>RL-17</u></p><p>47.0 3278</p><p>48.0 3385</p><p>49.0 3469</p><p>50.0 3536</p><p>51.0 3625</p></blockquote><p></p>
[QUOTE="benchracer, post: 1344900, member: 22069"] The next step was to do a MIN-MAX runup to find my pressure limit and start to map powder charge vs velocity. The seating depth loads @ 45.0 grains of RL-17 were, indeed, VERY mild. I decided to skip the max listed charge of 46.0 grains and begin my testing @ 47.0 grains. I loaded five rounds, in one grain increments, from 47.0 to 51.0 grains. I encountered no pressure signs, of any kind, during my testing. However, Lapua brass is tough stuff that tends to resist showing pressure signs. When using softer brass in other chamberings (such as Winchester, PRVI, or Norma), I have consistently noted pressure signs at velocities corresponding to QL predictions of 63k-65k psi. Though the top load of 51.0 grains showed no pressure signs, and still felt like a mild load, I am treating it as max. Here are the results of the MIN-MAX runup: Mark X Mauser 6.5x55 Shilen #4 contour barrel, 1:9 twist, 26" [U]RL-17[/U] 47.0 3278 48.0 3385 49.0 3469 50.0 3536 51.0 3625 [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
6.5X55 95 VMAX/RL-17 LOAD DEV
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