Question on propellants; how is it that a 4.5 inch barrel in a handgun can be different in accuracy?

[SJan]

Standard deviation.

The average velocity using powder 'A' could be compiled from a huge spread of 50-100 fps and show poor accuracy on your target.

While the same average velocity using powder 'B' is compiled from a tighter sampling of 10fps or less and will more likely result in great accuracy.

 

[Sweeney]

Is this a serious question?

If you consider the rest of the sentence I would say "Yes, it is a serious question".

 

[mac1911]

My question is about different powder brands when everything else is identical.

if I use different powders and can find safe quantities to get identical velocities will the accuracy be equal?

did'nt imagine it would be this tricky to communicate... if I find an optimum load can I get equal performance using other brands to get there?

same gun... same barrel.

What type of accuracy are we talking about ?
How are you “testing “ accuracy?

To answer your Question
Anything you change can have influence on the results.
Different burn rates will have different pressures applied to the….
Lets just say the interior ballistics change so anything from muzzle to target can change.
You might be surprised to find better accuracy playing around with the velocity.

I use a lot of different powders for pistol , whats on sale and available.
I dont jump right to “velocity” I work up to a load that satisfies
Safety, Consistency “ accuracy” and 100% function
My judge of accuracy for pistol
If I can keep my shots in the black of a Service Pistol Target at 25 yards I the gun and load are doing well.