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Old November 24, 2013, 08:05 PM   #1
tahunua001
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heavy 7.62x39 for an SKS?

hello all,
I'm thinking about messing around with a truck gun load next year for my SKS. I have a number of 150gr hornady soft points designed for 303 brit and 7.7 jap that I think would make a decent round for anything in Idaho given proper range and shot placement. my question is does the SKS have the twist rate to stabilize anything heavier than the standard 123gr bullet?
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Old November 24, 2013, 09:15 PM   #2
57K
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150s sized .311" will work, but I can't remember the twist rate of the SKS. I was never able to reload for the 2 I had because cases all got a pretty good scar upon ejection and I wasn't gonna load for rounds that could only be fired once safely. I have extra .30-30 150 gr. Core-Lokts that are semi pointed that I was gonna try just for grins. www.ramshot.com has good data for X-Terminator and the .311" 150 gr. SIERRA SPT. The 20" barrel they used had a 1 in 9.5" twist but they don't specify test barrel or actual rifle. My guess would be test barrel.
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Old November 25, 2013, 01:25 AM   #3
FrankenMauser
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Loaded to the proper velocity, 150s should be fine.
I shot at least 2,500-3,000 Wolf 154 gr FMJs and "hunting" SPs out of my Russian SKS when I had it. (At times, the 154s were cheaper than the common 120-125 gr stuff.)

I actually preferred those 154s to the 123s. They seemed more predictable. I don't know that I ever did any real accuracy testing, though...

There are also many cast bullet shooters that launch 150-170 gr bullets without problems.

As far as actual twist rates go, there were several used by different countries.
The Commies say that the 1:7.5" twist rate is good for up to 185 grains, and the 1:9.45" (often referred to as "1:10") twist rate isn't good for much more than 120-123 gr bullets. (My Russian had the 1:7.5" rate of twist.) Anything in between will be a compromise.
Check your twist rate, and go from there.
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Old November 25, 2013, 02:07 AM   #4
JD0x0
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According to Berger's twist rate calculator 150 grain bullets with a length of 1.25'' in a 1:10 twist should be able to stabilize at 1000fps in 0 degrees Fahrenheit, at sea level. This is basically a 'worst case scenario' because chances are you will be pushing bullets significantly faster, in warmer temps.
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Old November 25, 2013, 02:42 AM   #5
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You do know how to check your barrel's twist rate, with a cleaning rod and felt tip marker???

Put your cleaning rod with a brush all the way into your barrel, mark the rod at the crown, pull through slowly till the rod has made one complete revolution and mark the rod again at the crown. If the distance between marks is 10 inches it is a 1:10 twist, if the distance is 9.25 inches it is a 1:9.25 twist. Then check with bullet mfg to see what is the recommended twist rate for that bullet.

Simple.
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Old November 25, 2013, 02:05 PM   #6
tangolima
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Tried loading with Hornady 150gr(.312") sp for my sks. It worked fine. My sks is bit over bored so it likes .312" bullets. In fact it shoot pretty good with 100gr .32 cal pistol bullets (also .312" diameter) too.

FrankenMauser mentioned cast bullets. I always want to try that. But does it require gas check? The speed is too high for bare lead bullets, I am afraid. Thanks.

-TL
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Old November 25, 2013, 02:25 PM   #7
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If it helps any there are factory 157 grain loads. So I assume the heavier bullets work fine.
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Old November 25, 2013, 10:57 PM   #8
FrankenMauser
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Quote:
But does it require gas check? The speed is too high for bare lead bullets, I am afraid. Thanks.
Unless you want to load them for low velocity (less than ~1,200 fps), a gas check would be recommended.
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Old November 25, 2013, 11:10 PM   #9
Tomas
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I shoot 170gr lead .311 bullets over AA2520 in my NHM-91. It's proved to be an accurate loading for me. I don't mess around with the gas checks...it's an AK...
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