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Rifles, Reloading, Optics, Equipment
Reloading
Quick Load advice
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<blockquote data-quote="mtJim" data-source="post: 2616853" data-attributes="member: 121886"><p>I have used it successfully for five different rifles. I shoot a ladder over the magnetospeed, 10-15 shots in increments of case capacity - 30 some grains powder is .3 grain increment, 40 some is .4. Then start tweaking the QL variables to get the QL velocities to match the magnetospeed across the ladder. First make sure all of the QL inputs are correct - cartridge length, barrel length, water capacity. Then tweak powder Ba, shot start pressure, and weighting factor to get QL predicted velocities to (closely) match measured for each charge weight, this is some trial and error and sometimes takes a little effort. And need to closely match entire shot string, not just a small subset of it. I've found that once the predicted velocities are in line with my measured velocities, the QL pressures also align with pressure signs observed while shooting. If my ladder didn't go high enough to reach an observed max pressure, the QL estimate is a useful number, of course keeping in mind this is an estimate and slowly approach from a conservatively lower starting point. From here I find the OBT charge in QL then do an OCW test ranging from a little below the QL OBT charge to a little above. In all of my experiences QL OBT has been within .5 grains. I verified the first couple with a wider OCW test and landed in the same spot. Has been useful for a couple of wildcats where data is scarce. Also, load development is complete in 25-30 shots typically.</p></blockquote><p></p>
[QUOTE="mtJim, post: 2616853, member: 121886"] I have used it successfully for five different rifles. I shoot a ladder over the magnetospeed, 10-15 shots in increments of case capacity - 30 some grains powder is .3 grain increment, 40 some is .4. Then start tweaking the QL variables to get the QL velocities to match the magnetospeed across the ladder. First make sure all of the QL inputs are correct - cartridge length, barrel length, water capacity. Then tweak powder Ba, shot start pressure, and weighting factor to get QL predicted velocities to (closely) match measured for each charge weight, this is some trial and error and sometimes takes a little effort. And need to closely match entire shot string, not just a small subset of it. I’ve found that once the predicted velocities are in line with my measured velocities, the QL pressures also align with pressure signs observed while shooting. If my ladder didn’t go high enough to reach an observed max pressure, the QL estimate is a useful number, of course keeping in mind this is an estimate and slowly approach from a conservatively lower starting point. From here I find the OBT charge in QL then do an OCW test ranging from a little below the QL OBT charge to a little above. In all of my experiences QL OBT has been within .5 grains. I verified the first couple with a wider OCW test and landed in the same spot. Has been useful for a couple of wildcats where data is scarce. Also, load development is complete in 25-30 shots typically. [/QUOTE]
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