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#6409534 - 08/15/16 05:47 PM New powder lot
P & Y Offline
Tracker

Registered: 11/28/10
Posts: 959
Loc: North East Texas
When y'all move to a new lot of powder do you just keep the same charge and check for pressure signs? Should I back off a little and come back up? H4350 is what I'm running, not sure if some powders are more consistent than others, lot to lot.
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#6409551 - 08/15/16 05:52 PM Re: New powder lot [Re: P & Y]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 10783
Loc: Lewisville, TX
Lot to Lot, H4350 and Varget are one of the worst for lot to lot consistencies. Lately, H4350 has had a huge change in what I used to run a few years ago. The powder seems to be running slower burning, requiring more powder to equal the old speeds and pressures. I would 100% verify your load, and treat the new lot as a new powder. You are not "starting over" per se, but you will want to load up some test loads around the powder charge you previously had with the new lot. What is the last 4 numbers on your powder lot? I have about 3-4 lots of H4350 in stock now with notes on all of them.
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#6409574 - 08/15/16 06:03 PM Re: New powder lot [Re: P & Y]
P & Y Offline
Tracker

Registered: 11/28/10
Posts: 959
Loc: North East Texas
Thanks! Last four numbers are 2514

Where are the lot numbers on the 8lb jugs? confused2
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#6409578 - 08/15/16 06:04 PM Re: New powder lot [Re: P & Y]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 10783
Loc: Lewisville, TX
The lot numbers on the 8# jugs are on an orange sticker on the side of the container.
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#6409580 - 08/15/16 06:05 PM Re: New powder lot [Re: P & Y]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 10783
Loc: Lewisville, TX
I don't have that lot #.
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#6409663 - 08/15/16 06:39 PM Re: New powder lot [Re: P & Y]
dee Offline
Extreme Tracker

Registered: 04/10/10
Posts: 4985
Loc: Red River way
My recent lot of Varget is a good but slower (50fps) than my last lot with the same charge but has shot lights out (like .5 moa out to 1000yds) so I'm just gonna run it.
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#6410139 - 08/15/16 09:45 PM Re: New powder lot [Re: P & Y]
Bbear Offline
Tracker

Registered: 11/24/13
Posts: 711
Loc: West Texas
I'll usually back off a grain or so and work back up. Had some IMR4831 years ago that when I went to a new lot I just put the same amount in. Results were groups when the heck. Ended up having to load up an additional 1.5 grains or so to get the same groups.
Next batch, I backed off 2 grains and had the same groups as the last lot.
I've seen the same thing in IMR4350 lots as well as Varget. Hence, I buy 8# of the stuff so I don't have to fiddle with it as much.
I don't load anywhere near the quantity as Chad does, just use the powders for multiple cartridges.
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#6410459 - 08/16/16 08:02 AM Re: New powder lot [Re: P & Y]
DStroud Offline
Pro Tracker

Registered: 11/02/11
Posts: 1447
Loc: Waco
I got a new powder lot. Had to drive 500 miles one way to happen into these.
Had been checking all the usual places in Texas no luck just wandered into a store in Jackson, Ms and lucked out.

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#6410491 - 08/16/16 08:19 AM Re: New powder lot [Re: P & Y]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 20862
Loc: Wolfe City, TX
As Chad mentioned, I've also seen H-4350 "slow down".

6.5 Creedmoor, 140 A-Max
old charge 42.4 gr, yield 2800 fps

New powder lot I tested:

42.0
42.2
42.4
42.6
42.8
43.0

Best shooting charge was 42.8 gr and it yields 2800 fps MV.
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#6411820 - 08/16/16 10:11 PM Re: New powder lot [Re: P & Y]
P & Y Offline
Tracker

Registered: 11/28/10
Posts: 959
Loc: North East Texas
Thanks for the input, I will go down a grain and come back up until in get where I need to be. I think I'm done with one pounders if I can help it!
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#6411893 - 08/16/16 10:59 PM Re: New powder lot [Re: P & Y]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 10783
Loc: Lewisville, TX
Yes, get the 8# jugs if you can. It's worth it.
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#6411946 - 08/17/16 12:14 AM Re: New powder lot [Re: P & Y]
TackDriver Offline
Tracker

Registered: 05/02/14
Posts: 538
No one has the jugs for the H4831SC, if anyone finds some, give me a holler.

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#6412220 - 08/17/16 09:19 AM Re: New powder lot [Re: P & Y]
Bbear Offline
Tracker

Registered: 11/24/13
Posts: 711
Loc: West Texas
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#6412242 - 08/17/16 09:34 AM Re: New powder lot [Re: Bbear]
TackDriver Offline
Tracker

Registered: 05/02/14
Posts: 538
Originally Posted By: Bbear


Thanks Bear, Graf & Sons had difficulty processing my order, but found one at Midsouth Shooters for $20 less.


Edited by Big Stan (08/17/16 10:18 AM)

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