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Old February 26, 2008, 09:55 PM   #1
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243 Winchester

I'm looking for some info on 243 Winchester loads worked up using IMR 4350 powder.
It's main purpose would be light 60 to 75 gr varmit bullets. This powder does not seem to be too popular for this caliber in most books. I have a few pounds of it and would like to make use of it.
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Old February 26, 2008, 10:19 PM   #2
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My experience with .243 Winchester is IMR4895 worked the best for 75 Gr and lighter loads and IMR4320 for 100 gr loads. Mt favorite varmit load in the 70's was a 75 gr Sierra HP in front of 40.0 grains IMR4895. I didn't have good result with IMR4350 in .243. However, I found IMR4350 works great for .30-06 180gr ElK loads.
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Old February 26, 2008, 10:51 PM   #3
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4895 or 3031 perform well.

All kinds of loads available on-line ... look here
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Old February 27, 2008, 01:16 AM   #4
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I use H450 (no longer available), WW760, or IMR4320. IMR4350 is typically used in larger cases (270, 30-06, 7mm RemMag, etc), although for heavy bullets I imagine it would work in a 243.
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Old February 27, 2008, 11:26 AM   #5
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I'd think that 4350 with bullets that light might be a bit on the slow side.
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Old February 27, 2008, 02:03 PM   #6
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What manual(s) do you have? IMR4350 is a staple for the .243. Has been for eons. Mind you, Hodgdon's site doesn't give data for it with those bullets for some odd reason. They start using it at 85 grains. Likely due to the vast array of other powders they sell now.
My Lyman book gives.
60 grain bullets. 42.0(3291fps) to 47.0(compressed)(3726fps)
75 grain bullets 40.0(3160fps) to 45.0(3425fps)
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Old February 27, 2008, 08:45 PM   #7
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I have some loads with 44.0 of IMR 4350 in WW cases using the 85 gr. Sierra BTHP. Nice accurate load, but the 18.5 inch barrel on the M788 leaves something to be desired. We get much better groups and velocity with IMR 4895 and the same bullet.
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Old February 27, 2008, 10:33 PM   #8
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I use Hodgon 4831sc on my .243. Better accuracy,,,,Having the extra 4350 sounds like an excuse to buy a 30/06. Outstanding powder for that round..Tell the wife you just gotta buy one to use the powder up before it goes
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Old February 27, 2008, 11:02 PM   #9
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The current IMR/Hodgdon data doesn't show IMR-4350 for use with bullets lighter than 85 grains. It is a slow burner. For 90 grain bullets it yields 100-200 fps less at maximum pressure compared to other powders.
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