Hard to say, they get about 16 inches in ballistic gel.Will the 154 gr sp pass through or just an entry hole at 75yds
I can't tell exactly how far they would've got had I not shot them again. 1st deer I shot at about 35-45 yards. First shot it jumped high in the air, tried to run off but could only walk it seems. Walked 10 yards, I shot another time, it took another step, then dropped. I'm guessing and for it's sake hoping, dead right then. Last year, I shot the deer at 30-40 yards, shot might have been a bit high, probably got lungs only, but anyways, it dropped right there, started kicking like it was just nerves twitching. It did that for 5-10 seconds, and then surprisingly got back up in a mad dash back the way it came, which fortunately was kind of towards me. I shot again as it was in mid run. Don't know if I hit it with that one though, it started climbing back up the hill and seemed to lose energy and kind of kneeled down almost, at which point I shot a 3rd time from maybe 15-20 yards away. It dropped again on it's side and kicked and that was that. The more I think and read up on it, the more I think they both were finished anyways, but the one last year I saw real late in the day so I didn't want to risk injuring it so it slowly suffered while I tried finding it. The one the year before, was my first deer, and I just shot it again cause I figured I had got nervous and shot bad. In both cases the bullets seemed to pass through, and didn't leave much of a blood trail.The show they have been hit and USUALLY don't run further than 30 yards with good shot placement none of my shots being further than 50 yards
I've been handloading as well as shooting various brands of commercial domestic an Russian ammo in the X39 for around 15 years. Your basic Russian x39 bullet is a steel jacket copper washed gliding metal bullet with a lead core that is not bonded to the jacket,there is no real difference between FMJ,SP or HP ammo except how the bullets tip is formed at the factory,for all intensive purpose after about 100 yds. it's all going to act like FMJ. From all my experimentation with various Russian type ammo cup an core separation if the bullet does expand any as the mild steel jacket basically fragments instead of the bullet holding together is pretty common or they expand very little or not at all. When they do function as intended they work great but it's not repeatable unless all the criteria related to getting it to preform as intend is always the same,otherwise it a crap shoot. If all you have is the Russian ammo keep the range as close as possible to allow the velocity to work in your favour.I've only taken one deer with x39 with an SKS, my first deer, in fact. This was with Wolf SP ammo and I hit it the rump while it was running away from us. Nice sound channel all the way up its guts which tore up on of the hind quarters, but didn't see that much in the way of a growing wound channel from an expanding bullet.
My guess is the HP and SP bi-metal offerings don't expand as rapidly or to as large a diameter as their lead and copper brethren.