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I'm new to SKS, but checking youtubes the hunters say to use 154 gr soft point.
SG ammo seems to sell it here.
http://www.sgammo.com/catalog/rifle-ammo-sale/762x39-ammo
Tulo brand.
But others above have had experience hunting with this caliber, I don't.
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Keep in mind that there's a fair chance that the youtubers are just pushing an opinion based on a preconceived bias in favor of heavier bullets. Unless you run across someone who has actually done some testing, take those preferences with a grain of salt.
The 30-30 has taken countless deer and the x39 comes in pretty close in terms of performance. So there's a wide margin of error involved.
You run into the same bias when people try and argue that the .243 is sub-optimal for deer when the new hunters I take out drop deer with boring regularity with the .223 from an AR.
When it comes to white tails within 250 yards, the "optimum" gun choice probably depends more on the comfort/familiarity of the shooter with the rifle than it does the actual choice of caliber. You'll drop more deer based on your ability to properly place the shot than will it depend on energy or "knockdown power" or trying to micromanage or obsess over bullet weight options.