Cast Vs. Jacketed bullets in Sks

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7.62Man

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Was playing with the ballistic calculator on "biggameinfoDOTcom" came up with the following info.

Hornaby 123gr. sp @ 2325 = 1476 ft/lbs muzzle
= 1105 ft/lbs 100 yards
= 813 ft/lbs 200 yards (still good for deer!)
$0.23 for bullet

Lee C312-160-2R @ 2000 = 1421 ft/lbs muzzle
= 1073 ft/lbs 100 yards
= 803 ft/lbs 200 yards (still good for deer!)
$0.06 for bullet and gas check

The only real advantage that I see is the cost savings over the jacketed ones. Maybe the heavier cast will penetrate more? I have been using WLR primers, I wonder if CCI military primers would get me a few more fps out of my loads. The hornaby is loaded with 26.5 grains of Rl-7 and the cast is loaded with H335 27grains (case full).
 
Polish-Jack said:
how and why?
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The gas system...ie the mechanical parts such as the piston rods, and springs, are tough, but this whole rifle was built around the design of the 7.62x39 cartridge and it's pressure limits, and tolerances.

IMHO using heavier projectiles, and hotter powders is sort of like dropping a larger engine in a small car without beefing up suspension drive shaft, gearbox, frame etc etc.

In fact I have yet to find one reloading manual (North American or European) that reloads past 150 grains. You may get lucky for a while, but then again things may start to rattle apart.

Besides which IMHO there honestly is not much case volume in these cartridges to enjoy the heavier projectiles.

But yah never know, what 7.62Man is planning just might work.
I look forward to the results.
 
Ok worked up a load with speer 150 grain bullets and ran it thru the same load calculator. Wow what a differance.
At muzzle 1600 ft/lbs of energy
at 100 yards 1336 ft/lbs of energy
at 200 yards 1108 ft/lbs of energy

Anyone know what the recomended ft/lbs of energy is for black bear? I know whitetail deer is about 800 ft/lbs of energy.

I know with surplus 4895 you can get 155 grain cast up to 2300 fps in a yugo, but is the barrel not longer than a type 56 norco? And maybe that is why it so fast? that is a real thumper!
 
7.62Man said:
I know you can get stronger sks gas pistons and springs. I think it was the sksman web sight where I noted the stronger gas pistons and springs.
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That might be a good idea, and yes i was looking at possibly getting those also.
What I'd like to know is how hard would it be to make jacketed hollowpoints?
For zombies of course. :evil:
 
I can get 1750 ft lbs of energy at the muzzle with 125 gn sierra game kings using Vhit powder! I'll have to check but as 1700 ftlbs is the deer legal limit here it was something I spent a bit of time doing to get right!
 
Calum said:
That might be a good idea, and yes i was looking at possibly getting those also.
What I'd like to know is how hard would it be to make jacketed hollowpoints?
For zombies of course. :evil:
Click to expand...

Difficult and expensive. Casting hollowpoints is not a problem. You would need simply a hollow base mold and then turn them around when you are loading. Jacketed hollowpoints would require a swagging system at around 1 K. A much simpler solution would be to use some jacket 32 acp bullets and load them into 7.62 X39 brass.

The are the right size but it might be difficult to get them to cycle the action.
 
w ww.beartoothbullets.com has a 140gr cast flatnose, gas checked & pre-lubed, that would be dandy in an SKS. Comes in sizes from .310 to .314, $14.50US per 100. They also sell a 135gr soft-nose that looks like it'd work as well, but I've never bothered ordering from them to try 'em out. Experiment, anyone?
 
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