Quickload question
- Thread starter rdb8847
- Start date
"Accurately"??? No.
It may not even accurately predict your 50 degree velocities if you test at 50 degrees. Sometimes it's pretty close, but don't count on it. It can usually be significantly improved with some chrono data from the components you're using.
Temperature sensitivity is best left to testing. I have a Harbor Freight infrared temperature gun I use to measure case temperatures before firing.
Temperature sensitivity is best left to testing. I have a Harbor Freight infrared temperature gun I use to measure case temperatures before firing.
PhilC
Silver $$ Contributor
If you change the default ambient temp in QL it will.
I cant get this app to calculate bullet drop. No idea whats wrong. I think ive got everything input
I had to delete the app and reload it to get it to work. All good now
Jager
Gold $$ Contributor
Like most reloading manuals, Quickload assumes 70F ambient temp. When you go into the QL dialog and change that temp, the program adjusts the burn rate (Ba). Here's an example of how a fixed charge weight load will vary Ba's, and so subsequent predicted velocity and pressure numbers, as temp changes.
It's kind of a big deal for those of us who compete year-round.
My experience has been that QL's temp-based predictions are quite accurate as long as you start with a dialed-in load (case capacity is accurate and Ba has been "married up" with results from a good chronograph).
Or, rather than trying to guess what temps are going to be during a match, you can flip the script and try and keep your ammo at a steady state temp until just before it's time to go to the line. That actually works really well, with an impressively narrow velocity window, but is a royal pain in the butt.
Or just find yourself a nice, temp-resistant powder.
It's kind of a big deal for those of us who compete year-round.
My experience has been that QL's temp-based predictions are quite accurate as long as you start with a dialed-in load (case capacity is accurate and Ba has been "married up" with results from a good chronograph).
Or, rather than trying to guess what temps are going to be during a match, you can flip the script and try and keep your ammo at a steady state temp until just before it's time to go to the line. That actually works really well, with an impressively narrow velocity window, but is a royal pain in the butt.
Or just find yourself a nice, temp-resistant powder.
CF Junkie
Gold $$ Contributor
Just be aware that QuickLOAD marks the temperature insensitive powders with a *T in their Selected Propellant listing.
QuickLOAD recommends that you do not use the temperature adjustment feature with powders marked with a *T because the adjustment process is too severe.
Most of the powders marked change from 4 to 20 fps over the temperature range of 1 to 125 deg F. so they really don't need adjusting even if you are shooting in temps down to around 30 deg F.
Most of the others change from 100 to 155 fps over that 0 to 125 deg F. temperature range so they do require using the temperature adjustment feature.
Most powders on the list are unmarked and a few are marked with a *C and they recommend you use the temperature adjustment feature for them.
Alliant powders with a *T include Reloader TS 11, AR-Comp, Reloader TS 15.5, Reloader 16, and Reloader 23.
Hodgdon powders with a *T include Varget, H4350, H4831, H4831SC and H1000.
IMR powders with a *T are the Enduron powders IMR4166, 4451, 4955, 7977, and 8133
Vihtavuori powders with a *T are N550, N555, N565, and N568
Winchester has one powder with a *T - 6.5 StaBall
There are a few Bofors RP powders that are also marked with a "*T approximation" but I don't know what that means and, since I have never seen or used Bofors powders, I really don't care.
QuickLOAD recommends that you do not use the temperature adjustment feature with powders marked with a *T because the adjustment process is too severe.
Most of the powders marked change from 4 to 20 fps over the temperature range of 1 to 125 deg F. so they really don't need adjusting even if you are shooting in temps down to around 30 deg F.
Most of the others change from 100 to 155 fps over that 0 to 125 deg F. temperature range so they do require using the temperature adjustment feature.
Most powders on the list are unmarked and a few are marked with a *C and they recommend you use the temperature adjustment feature for them.
Alliant powders with a *T include Reloader TS 11, AR-Comp, Reloader TS 15.5, Reloader 16, and Reloader 23.
Hodgdon powders with a *T include Varget, H4350, H4831, H4831SC and H1000.
IMR powders with a *T are the Enduron powders IMR4166, 4451, 4955, 7977, and 8133
Vihtavuori powders with a *T are N550, N555, N565, and N568
Winchester has one powder with a *T - 6.5 StaBall
There are a few Bofors RP powders that are also marked with a "*T approximation" but I don't know what that means and, since I have never seen or used Bofors powders, I really don't care.
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