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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Magnum/RL33/180 gr Berger testing
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<blockquote data-quote="Fiftydriver" data-source="post: 1070556" data-attributes="member: 10"><p>I have found burn rate of VV570 and RL33 to be extremely similar but I have also found that VV570 has a higher burn temp and is harder on throat life then RL33.</p><p> </p><p>RL33 seems to be very sensitive to bullet positioning in relationship to the lands. Seat ogive within 10 thou of the lands and you get very consistent muzzle velocities. Seat much off the lands and you can see some very wide velocity spreads.</p><p> </p><p>VV570 does not seem to be effected as much by ogive to land relationship.</p><p> </p><p>RL33 also seems to be a bit dirty until you get up to its upper range of working pressures but loaded to top pressures. similar to other stick powders.</p><p> </p><p>US869 is also a powder that likes to be loaded to its top pressures, like most of the other ultra slow burning ball powders, keep it in the upper 5% of its pressure range and burns relatively clean for a ball powder. Under that and like WC872, you will need to really stay on top of the carbon build up.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 1070556, member: 10"] I have found burn rate of VV570 and RL33 to be extremely similar but I have also found that VV570 has a higher burn temp and is harder on throat life then RL33. RL33 seems to be very sensitive to bullet positioning in relationship to the lands. Seat ogive within 10 thou of the lands and you get very consistent muzzle velocities. Seat much off the lands and you can see some very wide velocity spreads. VV570 does not seem to be effected as much by ogive to land relationship. RL33 also seems to be a bit dirty until you get up to its upper range of working pressures but loaded to top pressures. similar to other stick powders. US869 is also a powder that likes to be loaded to its top pressures, like most of the other ultra slow burning ball powders, keep it in the upper 5% of its pressure range and burns relatively clean for a ball powder. Under that and like WC872, you will need to really stay on top of the carbon build up. [/QUOTE]
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7mm Allen Magnum/RL33/180 gr Berger testing
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