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375 RUM and the 260 Accubond...

 
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  #8  
Old 11-26-2013, 03:58 PM
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Re: 375 RUM and the 260 Accubond...

What type or shape is the superformance powder? Ball, rod, hybrid...?
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  #9  
Old 11-26-2013, 05:55 PM
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Re: 375 RUM and the 260 Accubond...

"In my research".......
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My guess on W3P .308 230 Grain Bullet: G1 .740-.755
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Old 11-26-2013, 06:26 PM
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Re: 375 RUM and the 260 Accubond...

Doublezranch

Ball, fine grained and almost no flattening. Meters very uniform in a Lyman #55 or a Lee Perfect Powder Measure. The Lee may be at the upper end of it's capacity to meter that much powder as the 375 RUM can use about 100grs+.

In 30-06 Hornaday and Hodgdon do not require a magnum primer but anything that has 70grs+ of powder to set fire to I use a Mag primer.

It is a "tailored" powder meaning the Chemical Engineers gave it specific characteristics as to grain size, nitroglycerin content, deterrent coatings etc. so it works in a narrow range of conditions unlike, say, 4895 which has a broad application and tolerance. 4895 will burn well anywhere from 20kpsi to 62kpsi but Superformance is supposedly designed around 58kpsi - 62kpsi according to what I've read. Also read that as it is a new technology ball powder it is far less sensitive to temperature fluctuation than traditional ball powders.

In today's world we reloaders enjoy the best selection of components ever. When I started in 1971 there were maybe 12 - 18 different rifle powders and may be that many shotgun/pistol offerings. 4831 was surplus only from Hodgdon's and Alliant had RL 7 and RL17. Last time I looked there were 138 different powders on the market.

Don't rule out the Scandinavian powders, Norma or VitaVourri. They are different enough to explore and back in 1974 I had a load in 30-06 that tossed a 200gr pill faster than anything else with Norma 205. The pressure signs were nonexistent.

Superformance is on my short list of powders to try if I need something in a burn rate around 4350/4831.

Just my experience...
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Old 11-26-2013, 06:31 PM
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Re: 375 RUM and the 260 Accubond...

Alright Riley....

When I started this quest, I asked for Riley's knowledge. His recommendation was IMR 4350 and 260 accubonds. Kids.....
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Old 11-26-2013, 06:36 PM
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Re: 375 RUM and the 260 Accubond...

Thanks Kennibear for the education. It sounds like you have a very good understanding of powder and I appreciate your willingness to explain. I will give superformance a try.
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Old 11-26-2013, 10:06 PM
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Re: 375 RUM and the 260 Accubond...

Real Guns - Handload Data - 375 Ultra Mag

This might provide a few ideas as well.
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  #14  
Old 11-27-2013, 02:00 AM
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Re: 375 RUM and the 260 Accubond...

Quote:
Originally Posted by Doublezranch View Post
Alright Riley....

When I started this quest, I asked for Riley's knowledge. His recommendation was IMR 4350 and 260 accubonds. Kids.....
If you had a regular 375h@h like I do, I'd say 4320.. It's worked well for me with the 260 ab, though I'm only loading the 300tsx with 4320 at present.. With your extra capacity 4350 should work well.

I've worked with superformance a bit and it does well in my 25wssm, but it's flaky to bullet and primer. Change one parameter and a moa load goes to three. Of course this is win bbl. I'm working with so take that with a grain of salt.
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