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Same Powder Different Lot ??(Please read)

 
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  #1  
Old 11-08-2012, 08:54 PM
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Same Powder Different Lot ??(Please read)

Last time I had shot long range was during the summer. I have all of my data recorded.

Rifle 300 RUM

Powder retumbo
Primer Fed 215M
210 Berger .
MV 2900 FPS
Now for my questions

1. I bought a new pound of Retumbo powder so what should I expect when I run the same MV into my ballistics soft ware, this being a different Lot ?

2. What about the Temp. change ? It will be colder when I try and shoot tomorrow than when I was shooting back in the summer ?

I will have all of my answers tomorrow but I just wnated to hear your experience .

Thanks for taking the time to read ...........,
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Old 11-08-2012, 08:59 PM
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Re: Same Powder Different Lot ??(Please read)

I haven't yet changed lot#'s with Retumbo, cause I bought 8#. I don't know what to expect when I change lots the first time either.
Interested to read what comes of this.
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Old 11-08-2012, 09:09 PM
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Re: Same Powder Different Lot ??(Please read)

i changed lots of retumbo in the 338 Lapua and had to go from 84.4 grains to 82.4 grains to get back to were there werent ejector marks and i got accuracy back. My velocity dropped 150 fps.
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Old 11-08-2012, 09:30 PM
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Re: Same Powder Different Lot ??(Please read)

There was a thread 3-4 years ago on here about this same thing on the same powder and the same thing happened new lot was hotter by a couple grains. That's why I always buy 8lb jugs, I know that doesn't help you much but if your gun likes retumbo buy 8lbs and drop down a couple grains and work your way up and hopefully you'll keep your velocity before pressure hits.


Nathan
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Old 11-08-2012, 10:43 PM
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Re: Same Powder Different Lot ??(Please read)

If your old lot of Retumbo has a lot# of 5026 or lower it is the right burn rate, if the lot# is 5027-5098 your velocity will likely be higher or be the same with more pressure, I found this out in my 6.5x284, had to back off 1.5 grns and lost 30fps, so I went to another suplier and got a bunch of the older lot. The powder between the lot numbers I mentioned is closer to H1000 than Retumbo, about on par with RL25.
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Old 11-09-2012, 07:22 AM
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Re: Same Powder Different Lot ??(Please read)

+1 find a lot that your rifle likes and buy 8# jugs, more than one if you can. The lot-to-lot variance is not isolated to Retumbo or H1000, but is also true for RL-25 (the three powders that I am most familiar with). When I get new jugs, I run them over the chronograph to match the needed velocity, if I can. I recall a major lot-to-lot variance problem with Varget a few years back also.

Jeffvn
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Old 11-09-2012, 05:24 PM
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Re: Same Powder Different Lot ??(Please read)

Thanks for the replies. my impacts where high at 556 yards today .
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