Any body mix different lots of the same powder

[Hair Trigger]

I always pour the last of a can of powder into the next and mix very well by shaking and rotating vigorously.

This is what I also do. By the time I get to the bottom of a powder can, there's less than what it would take to make a single round. I can't see how 30 grains of powder of one lot could affect 7000 grains (one pound) of another lot, when they are the same type of powder.

 

[Kurusu]

Meaning what, exactly? What is the accuracy standard?

I'm genuinely curious about this ... my 9mm PPQs all group 2" at 50 yards, I have multiple 629's that will pop milk jugs at 100 yards all day long or my PRS rifles that are all sub 1/2 MOA. All of these rifles and pistols have done these things for many years and none have ever run factory loaded ammunition.

I guess my accuracy standards are just too low or I have no idea what I am doing.

For my part. Nothing close to 100 yards. Only 27(25 meters). But I have won and lost matches by one lousy point Sometimes on the very last shot.

 

[yeti]

I don't store them mixed. I do open and pour the next available different lot, same powder into the measure and just keep loading. So, technically I do mix.

Promo was the only powder that I ever even noticed a lot - lot difference with.
The difference was minor, but noticeable.

 

[1&done]

What is "OBT" ?

"Optimum Barrel Time". This is about as far off topic as we can get: Optimal Barrel Time Paper

If you are not a long range rifle shooter and also ~ 75% crazy then you can just ignore.

 

[ruger 22]

Powders that we buy for handloading are blended at the factory so that a certain given weight,(dictated by your loading bushings etc.), will give a specifically set performance. If your powder is in good shape you can in fact mix them as long as they are the same. Example, you can mix Red Dot with another Red Dot, Blue with another Blue etc. It is safe as long it is the same powder.

 

[Nemo288]

"Optimum Barrel Time". This is about as far off topic as we can get: Optimal Barrel Time Paper
If you are not a long range rifle shooter and also ~ 75% crazy then you can just ignore.

I am not a long range shooter but I could not ignore it either (maybe I am 75% crazy).
Thanks! I never would have guessed that acronym.
I find I actually have the PDF of that article I got from the RSI site (see below).
Barrel time is also how double rifle guys attempt to regulate a non-standard round.
This leads to the not so obvious solution of dialing back lighter bullets and hammering the heck out of heavier than normal ones,
trying at the same time to not blow up your precious rifle or self.
I also enjoy anything to do with internal ballistics; isn't that what we reloaders are here for?
Interesting stuff.
I sometimes wish I had gotten a barrel pressure strain gauge setup.
It's about the only style of ballistics lab equipment I never acquired.
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