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I have a love-hate relationship with H380. It works great with 120 grain bullets in the 7mm Mauser. But it won't work for me in the 6.5x55mm.

H380 is a fantastic powder for the 7.65x53mm Mauser and it should be a great .308 powder.

I checked with the Hodgdon Book and it seems that you could come close to filling a .308 case with H380 and still be able to safely use a 168 grain bullet.

Does anyone here have any H380 experience with the .308?

Mad
 

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I would be inclined to ask what the differences are between the weapons are that you are running the loads through?, barrel leangth, rate of twist.
I have set up a few loads for a cousin of mine, 6.5x55 for a Krag-Jorgenson sporterized by Wichita Gun Works back in the late 60s with a 140gr Spire Point, 39.6gr, H380 for about 2400fps, this is 1.2gr less than what Hornady calls Max, loading max reduced accuracy at 300yds, I have never cronographed this and I have not loaded any in about 5 years.
I took all this from notes made when I was loading for his hunting Elk.
I personally have used and shot H380 in my 7.62X54R, (91 Mosin) sporterized by New England Arms back in the mid 50s 22.5" barrel and 1in 10 twist.
The load I ran up for this was useing 168gr BTHP,49.8grs H380 giving 2700fps (also never put to crono.) but I have a lot of faith in Hornady, I personaly preferr 54.2grs of WIN760 same fps but seems to offer better accuracy through my Russian.
I would think that if you reduced this load by 10% you would have a very fine Baseline but (THIS IS JUST MY OPINION)
Rusty
 
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