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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
I guess whacking a pig counts as varminting....
My 1260 round case o' 7.62x39 will eventually dwindle. I'd like to use my chinese sks with some fat cast bullets for pig eradication once I start casting for it.
Sure would like to find something in the 230-250gn plus range.
Curious what the heaviest cast bullet is that will stabilise in the sks. Any problems with recoil springs needing adjustment/gas hole needing to be enlarged to reliably cycle the action?
Or is it just a try-it-and-see thing?
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Joined: Nov 2011
Posts: 31,125 Likes: 5
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,125 Likes: 5 |
SKS's came in a variety of different twist rates.
What's the twist on yours?
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Unfortunately, I've never measured the twist.
As far as bullet selection goes, the .310 bullets that drop from my Lee mold, after powdercoat, measure a solid .318 or so. I could play with diameters as well to properly engage the rifling in the ~.313 bore.
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Wikipedia says 1 in 9.45, for what it's worth.
At the 1 in 8 twist of 300BLK, the NOE 247gn boolit or the Lee 230 gn stabilizes.
Does it stand to reason that, with an ~18% slower twist, an increase of velocity of ~18% will produce the same stability?
In that case, the 300BLK's 1000fps with these boolits should compare to the same bullet in an SKS at ~1180 FPS.
Thoughts?
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Doing a rough energy-equivalency calculation, a 123gn bullet at 2400 fps in the SKS should equate to a 247gn bullet at ~1700 FPS. Which should stabilize fine.
I could play it safe with the SKS and start at ~1200 FPS. Kinda like a hot-rodded 45 super with better downrange stability. BC is a might different, though.
Mag and throat fit of this "pringles can" boolit are another issue altogether.
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Joined: Apr 2008
Posts: 1,981
Campfire Regular
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Campfire Regular
Joined: Apr 2008
Posts: 1,981 |
I shot cast bullets a little over 200 grains in a Ruger 77 MKII 7.62x39. I don't recall the Ruger's twist rate; may or may not be the same as SKSs. That's been a long time ago, but as I recall, the heavy bullets shot well. There's a cast bullet 7.62x39 article in the October, 1995 edition of HANDLOADER. A number of heavy bullets are used.
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Joined: Jan 2003
Posts: 5,202
Campfire Tracker
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Campfire Tracker
Joined: Jan 2003
Posts: 5,202 |
Lead bullets in gas operated guns will almost always cause problems due to lead shavings plugging gas ports
One shot, one kill........ It saves a lot of ammo!
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Snyper, advice well taken. I'm planning on powdercoating the bullets so hoping for little fouling.
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Bump for any further advice?
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Joined: Sep 2009
Posts: 5,567
Campfire Tracker
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Campfire Tracker
Joined: Sep 2009
Posts: 5,567 |
The lead bullet in ported gas operated myth is just that �. a myth. I have shot 1000s of wheel weight .311 bullets from 130 to 190 gr in a slew of M-1s, M-1 carbines and 2 different R-1s. Initally believing the myth, I took them apart. There was no lead to be found anywhere.
As pigs are generally shot quite close, you might want to try a heavy flat nosed .313 bullets at 50 and 75 yards and see how it works.
Have you been to the CastBoolits (note spelling) site ? Probably folks there who have done it.
Last edited by astralabs; 01/24/14.
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Nothing I could find specifically for the 7.62x39. I saw threads stating that was the topic and they quickly veered off in the 300 Whisper/BLK route.
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Joined: Dec 2012
Posts: 42
Campfire Greenhorn
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Campfire Greenhorn
Joined: Dec 2012
Posts: 42 |
Bump--any other opinions?
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Joined: Mar 2004
Posts: 12,806
Campfire Outfitter
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Campfire Outfitter
Joined: Mar 2004
Posts: 12,806 |
With a twist that is faster than a 10, I don't think you'll have any problem stabilizing typical cast bullets up to and perhaps beyond 220 grains.
The 10 twist started with the Krag shooting 220 round nose FMJ.
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