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Velocity change with H4350???

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Velocity change with H4350???
« on: February 05, 2018, 06:06:23 PM »


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I believe it's common knowledge that H4350 is supposed to be temp insensitive. What are your experiences with this powder and temperature increases or decreases? With temps in NW IN not so conducive to load development I'm trying anyway. Ran several factory loads over the Magnetospeed and seem to be getting a bit less than advertised.... which I expected. Can a  guy expect a velocity increase from these 20* avg. temps to say 70* with H4350. If so how much? Is it worth trying to ladder test handloads at these temps?
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Re: Velocity change with H4350???
« Reply #1 on: February 06, 2018, 02:34:50 PM »


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Mine increases 25-50fps from winter to summer.  Can't really give you exact temps.  A lot of it depends on if and how long your loaded ammo is exposed to direct sunlight.
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Re: Velocity change with H4350???
« Reply #2 on: February 07, 2018, 01:07:04 AM »

Jeff M

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I've noticed velocity changes as well. I also don't have any hard data, but I've been as much as 1/2 mil high at 800 in 120 degree heat.

That said, I generally try to do load development in temperatures near the Temps I'll be shooting in.
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