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Joined: Mar 2001
Posts: 2,614
Campfire Regular
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OP
Campfire Regular
Joined: Mar 2001
Posts: 2,614 |
Does the accuracy of QuikLoad vary by the design of the case? By accuracy I mean forecasting velocities with specific components. I've heard that is does a better job with "normal" cases such as the .30/06 etc than it does with "improved" cases or the new short-fat cases like the WSM.
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Joined: Dec 2000
Posts: 29,348
Campfire Ranger
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Campfire Ranger
Joined: Dec 2000
Posts: 29,348 |
I haven't tried QuickLOAD on any of the new short, fat cases, and I hadn't heard of any weak accuracy with that kind of case. I also haven't tried it on any straight cases, and I've heard that the designer-programmer himself acknowledges its weak accuracy with straight-case cartridges.
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<br>There is a sleeper block ("weighting factor") on one of the input screens that has to do with the shape of the case. Suggested weighting factors are 0.75 for cylindrical cases, 0.5 for typical necked cases, and 0.33 for drastically necked cases. Fiddling with the weighting factor can "fit" QuickLOAD to your gun and cartridge so that on the basis of completed load tests, QuickLOAD can more accurately predict the velocities of other loads. Overlooking, ignoring, or using the wrong case-shape figure in this block can certainly make QuickLOAD's prediction wide of the actual chronographed velocity.
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<br>With careful attention to ALL the input figures, QuickLOAD has given me predictions that were within 10 ft/sec of the chronographed velocities -- sometimes closer.
"Good enough" isn't.
Always take your responsibilities seriously but never yourself.
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Joined: Jan 2001
Posts: 21
New Member
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New Member
Joined: Jan 2001
Posts: 21 |
Ken, Is this the program you're using to estimate pressures from particular loads, ie: Low pressure-full case thread? If so could I use this program to find loads in the pressure range I'm after by adjusting the weighting factor to fit my actual data into the program and then adjusting the charge weight until the program is estimating a pressure in the range I'm looking for? I realize this will not give me a "hard" number like I'd get from an actual strain guage installation, but in the pressure range I'm after a small variation should still allow a good margin of safety.
BD
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Joined: Jan 2001
Posts: 21
New Member
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New Member
Joined: Jan 2001
Posts: 21 |
I'm just talkin' to myself to bring this subject back around. If it dies again I'll let it go, promise.
BD
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