10mm in QL

S

stagpanther

New member
I'm just getting back into reloading for 10mm for a new AR blow-back build I did--but I'm "rediscovering" the huge discrepancy between quickload's pressure assessments and most everyone else's--including formulas I take right out of the big manufactuerer's books. Does anyone know why this is?
 
It has long been said that Qucikload is extremely good at simulating internal ballistics with bottle neck rifle rounds and not nearly as good at simulating straight wall cartridges.
 
It's most likely the same as usual: you have to measure case volume in grains of water and make sure it's matched.

Pistol rounds are low volume and a little bit makes a big difference. I have had good success with the 10mm in QL with this method. QL is estimating based on a different lot of powder as what you are using as well which can be a factor.

Different primers etc....
 
I was able to get quickload to match the velocity of my 45-70 loads and 44 mag within 20 fps by increasing the case water volume. With revolvers, I have heard it has to do with the cylinder gap acting like a longer case before the bullet engages the rifling. Also, I had to adjust the start pressure.

So....then you should wonder just how accurate my quickload pressure estimate actually is given all the exaggerations I had to make to get it to approximate the velocity.

What I have noticed is that less tweaking is necessary in short pistol cases like 40 S&W or 9mm than in 44 mag. I think it has been said numerous times that QL is best used on bottle neck cartridges. For pistols I actually trust the reloading manuals and powder makers data a lot more than quickload.
 
For pistols I actually trust the reloading manuals and powder makers data a lot more than quickload.
Click to expand...

I don't "trust" QL at all actually. I always compare my results to load manuals and if there is a major variation, I trust the manual over QL.

Usually QL and the manuals are pretty close when you factor OAL variations and minor differences in bullet bases and such.
 
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