Powder lot change... what do you do?

[DoubleGobble00]

So I worked up a load for my 300 win and 300 rum with a pound of H1000. I've used the whole pound and will buy some more. When starting with the new lot, where do you start? A few grains under existing load and work up?

Thanks,

DoubleG

 

[Barrelnut]

Talked to an IMR engineer one day. He said that powder lots can vary +/- 3%. And that is some standard that they adhere to. But he said actually results are usually inside +/- 1.5%
I had a lot of H4350 one time that had a 5% difference.... So, I just back off 5% and work back up.

 

[Canhunter35]

Unless I'm flirting with max already, I just load up some and go shoot at distance and see if my drops match, if they don't then I tweak load by running a ladder test and recentering on the node

 

[ar10ar15man]

i do a search on this forum and read the thread.

 

[TRG65]

If you don't already, it would be worth it to buy an 8#. Especially loading for 2 cartridge, that burn as much as those two. When I switch jugs, I chrono and work from there. I had a 6.5 load drop from 2825 to 2800. Still shot well and had good sd's but for the long ranges i just added some .1s

 

[Antonio m]

I start a couple of grains low, depending on the situation. New brass, primers lots also. Why not, shooting is kinda fun for me

 

[Almondgrower]

Definitely back off about 5% and work your way bk up, just not worth it ..... Depending how identical you want the load to be to your previous load , you could then cronograph and shoot at distance to verify . 8# is always nice you only need to do it once in a while ...... if you get a higher variance Lot on the next one and you are near or at max in your gun ......5% pressure increase ......, not worth the risk to you or even the gun

 

[hunter67wa]

chronagraph to find same velocity. Buy 24lbs at a time same lot for those burners. lol

 

[Mike AVM]

Back down a grain or two. Compare velocity. H1000 is pretty consistent. You might get lucky and get the same lot #.

 

[DoubleGobble00]

Thanks for the info!

 

[whirlwindjml]

chronagraph to find same velocity. Buy 24lbs at a time same lot for those burners. lol

Lord have mercy on the fire fighters that come to my house if it ever burnes. Each gun I get gets at least 1k primers....and at least 1 8lb jug of powder and each rifle gets it's own data book.

Can't cope with 1lb