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Is 9 twist satisfactory for the 195 EOL?

 
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Old 08-20-2013, 02:06 PM
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Is 9 twist satisfactory for the 195 EOL?

I have a 32" RUM bbl on order, and my choices were 8, 9, and 10. Since I am currently the shooter of relatively light bullets (140 Super Shock Tip), I didn't go with the 8 twist. But with this heavyweight making so many waves, claiming to be the "king of the mountain", in terms of slipperyness, I'm having a hard time ignoring it. Especially being that it IS in MY caliber. Any ideas on how tight the groups would be at say 600yd, compared to the 140 SSTs? I'm very generous with the amount of powder that goes into the cases.
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Old 08-20-2013, 02:21 PM
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Re: Is 9 twist satisfactory for the 195 EOL?

My Sendero SF has a 9.25" twist and it shoots 180's fine.

From my experiences I can't see why it wouldn't work...
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Old 08-20-2013, 04:03 PM
Edd Edd is offline
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Re: Is 9 twist satisfactory for the 195 EOL?

Berger recommended a minimum twist of 8.5".
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Old 08-20-2013, 05:01 PM
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Re: Is 9 twist satisfactory for the 195 EOL?

My guess is you could get away with it above 4000 ft asl. with a 9 twist. But for the 195's a 8.5 or faster is recommended and will most likely be needed for the best accuracy.

A 140 and a "generous amount of powder" in a 7 RUM ? Better have the smith fit a spare barrel or two while he is at it.

Jeff
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Old 08-20-2013, 05:28 PM
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Re: Is 9 twist satisfactory for the 195 EOL?

Isn't this all speculation along with the boogey man and elvis at this point or are these things actually scheduled to get made in the foreseeable future?
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Old 08-20-2013, 06:02 PM
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Re: Is 9 twist satisfactory for the 195 EOL?

I'm speculating you may burn your 9 twist up long before the 195s hit the market. Shoot the 180's in the meantime if you crave a heavy hitter. They should shoot great in a 9 twist RUM.
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Old 08-20-2013, 08:50 PM
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Re: Is 9 twist satisfactory for the 195 EOL?

So 8.5 is "recommended" minimum? All that means is that they won't shoot "ideally" with 9. But I didn't realize they aren't actually even out there yet. So then, nobody has even shot any yet, to be able to say? It looks like that answers the question for now.

In case you couldn't guess, I'm actually a velocity-craver by nature. You just can't help but admire the kind of performance numbers which that round represents though. Just like with Porsche (well, sort of), there "literally" IS NO SUBSTITUTE for numbers like that. Not in 7mm, anyways.

FYI - I refer to my solution to fighting barrel burn as the "mom" treatment. It's an acronym for moly-on-moly, meaning that moly-coated bullets are shot though a moly-coated bore. It's really too early to say how well it is workng at this point, as I haven't been doing it for very long yet. But the more I do it, the closer I seem to be getting to becoming a dedicated believer in the process.
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