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#5532255 - 01/10/15 09:02 AM does mixing powder make sense?
daniel1381 Online   content
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Registered: 03/07/12
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Loc: longview texas
Was at the range and a guy(in his 40's) came up to me asking where I buy my reloading powder. He said he likes buying all the same lot. when he cant find the same powder from all the same lot he said buys what he can and mixes it all up?? Is this even right?


Edited by daniel1381 (01/10/15 09:04 AM)
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#5532356 - 01/10/15 09:51 AM Re: does mixing powder make sense? [Re: daniel1381]
FiremanJG Offline
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Registered: 12/16/08
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Sure as long as the type of powder is all the same.

So if you had six one pounders of H-Varget, but there were two or three lot numbers you could mix them all in a tub then put them back in their cans. Now you have consistent powder in one custom made lot. As soon as you run out and go to a new lot, you'll have to tweak the load starting under your original powder charge and work back up to it. Making sure the new lot isnt running hotter.
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#5532427 - 01/10/15 10:22 AM Re: does mixing powder make sense? [Re: daniel1381]
daniel1381 Online   content
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ok cool learn something new every day
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#5532685 - 01/10/15 12:35 PM Re: does mixing powder make sense? [Re: daniel1381]
wburke2010 Offline
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That is what I had to do. I found five pounds of H4350 a while back and they were all different lots so I mixed them all and haven't had a problem yet.

Walter

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#5532693 - 01/10/15 12:41 PM Re: does mixing powder make sense? [Re: daniel1381]
ChadTRG42 Offline
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Registered: 09/16/09
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Loc: Lewisville, TX
I'll be honest, I've done it also. When I have a small amount of the same powder in multiple pounds, I'll add them together, label the jug as "mixed" and use it later. I won't do this for my match ammo or ammo I would be using for competition. I stick to one lot.
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#5532738 - 01/10/15 12:58 PM Re: does mixing powder make sense? [Re: daniel1381]
RiverRider Offline
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Registered: 11/11/07
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I mix different lots of the same powder also. That way I can work up a load and not have to diddle with it again so soon.

I was shooting with a benchrester one day who told me he adjusts the burn rate of some of his powders by mixing in another number. As an example he might want to slow down the burn rate of the H4350, so he'd mix a little H4831 in it. I think that would be okay because the chemistry of the two powders is similar. I personally would NOT do that nor recommend it, but I think someone who really knows about powder chemistry and manufacture could do it safely. I don't pretend to know that much. I do know that you would never blend a single-base powder with a double-base powder and I can't imagine why anyone would blend H4198 with Retumbo.

Same number but just different lots? As long as one of them's not so old that the chemistry may have been changed, no sweat.
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#5532906 - 01/10/15 02:38 PM Re: does mixing powder make sense? [Re: daniel1381]
tth_40 Offline
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Registered: 04/05/10
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Loc: North Texas.
Yup.

Been doing it for years. Glad I'm not the only one. cheers
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#5537986 - 01/12/15 02:39 PM Re: does mixing powder make sense? [Re: daniel1381]
schmellba99 Offline
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Registered: 06/30/14
Posts: 178
Loc: Gulf Coast, Texas
It really doesn't make that much sense. Cannister grade powder is tested and blended at the factory to be within a 3% burn rate from one lot to the next. I suppose you could run into a case where you had a high and low end lot and have a spread of about 6% (max) burn rate, but that would be extremely unlikely.

Your rifle and groups aren't going to notice, even at range, a difference of 1%-2% burn rate between lots of powder. You'll get that much spread just from the same cannister.

Now, if you have a jug of a type of powder (say Varget, for example) that has a half pound left and you dump it into an 8 lb keg that has 6 lbs and give it a good shake or two, are you going to hurt anything at all? Nope, not in the slightest.

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#5538015 - 01/12/15 02:53 PM Re: does mixing powder make sense? [Re: schmellba99]
ChadTRG42 Offline
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Originally Posted By: schmellba99
Your rifle and groups aren't going to notice, even at range, a difference of 1%-2% burn rate between lots of powder.

Depends on the rifle and the shooter. Hunting rifle for 100 yards, maybe not. But I have several rifles that a change in lot number have and will change up my group sizes, and for sure change up my speeds. And that will certainly change up my trajectory and accuracy at longer ranges. So yes, a change in powder lot numbers will effect your groups and speeds.
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#5538017 - 01/12/15 02:54 PM Re: does mixing powder make sense? [Re: daniel1381]
schmellba99 Offline
Woodsman

Registered: 06/30/14
Posts: 178
Loc: Gulf Coast, Texas
You are an exception then, but to each his own.

Bottom line is that it doesn't hurt, but really doesn't make much of a difference either. The big thing is to make darn sure you are mixing the exact same powder from the exact same manufacturer.

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#5538177 - 01/12/15 04:10 PM Re: does mixing powder make sense? [Re: daniel1381]
Judd Online   content


Registered: 01/22/09
Posts: 10762
Loc: Sachse, TX
Count me as an exception too. I had a gun that was hammering, ran out of Varget went to the next lot and matched velocity by making a very small adjustment and the gun wouldn't shoot it. I went to a different lot and it started hammering again.

I don't know what it was about that one lot but it was weird in that particular barrel. Funny thing is I'm using that powder I couldn't get to shoot in another gun and it's now driving tacks and the best shooting gun I have right now. Things go as planned I'll run out of that powder this season right about the time that barrel needs setback or pulled.

So I defintely say to mix them and create one big lot that you can base the load off of and keep through the life of the barrel, rather than taking the chance the lot will make a difference.


Edited by Judd (01/12/15 04:11 PM)
Edit Reason: added last paragraph to answer initial question
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#5538179 - 01/12/15 04:11 PM Re: does mixing powder make sense? [Re: schmellba99]
wburke2010 Offline
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Originally Posted By: schmellba99
You are an exception then, but to each his own.

Bottom line is that it doesn't hurt, but really doesn't make much of a difference either. The big thing is to make darn sure you are mixing the exact same powder from the exact same manufacturer.


Depends on the type of shooting you do like chad mentioned. On my match rifle changing from lot to lot does has some variances in it. Which makes me go back and re work the load.

Walter

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#5538266 - 01/12/15 04:48 PM Re: does mixing powder make sense? [Re: daniel1381]
daniel1381 Online   content
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I have a 7lb just of retumbo 1 lot number
And 5 1lb just 2 are one lot and 3 are one lot..should I mix it all
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#5538282 - 01/12/15 04:53 PM Re: does mixing powder make sense? [Re: daniel1381]
Judd Online   content


Registered: 01/22/09
Posts: 10762
Loc: Sachse, TX
I would...mix it real thoroughly so you have one big new lot.
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#5538332 - 01/12/15 05:20 PM Re: does mixing powder make sense? [Re: daniel1381]
daniel1381 Online   content
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Registered: 03/07/12
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will get right on that! thanks for help !
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