Im seeing the same results with those S&B 110 PTS bullets. They're just not putting them on the ground. I've lost my last 4 in a row them, in fact. I bought 300 from SGAmmo because I can't load my usual 120 SST's as cheap as I got those, and they had great reviews. Needless to say I'm done with them though. Back to the 120's.
I have fallen victim to the same decision (cost vs best option) and unfortunately more times then I care to recall your now going to be looking for a buyer and trying to recoup costs so you can try again ...
Tips - I have , as a frugal ammo buyer , Are based on the hunting situation for example:
If you're looking to send more than a couple of shots down range in quick succession - I.e. Semi-auto high capacity weapon. Consider buying a small quantity of the more moderately priced ammo (in the case 120gr SST) and then finding a cheap option (preferably brass cased) that shoots to near the same POI and load these cheaper cartridges below the top two rounds in the magazine.
The theory is that running follow up shots are lower percentage (hits) and typically/hopefully the animal is already wounded so you don't need full awesome-sauce , higher cost , ammo to get the job done.
Also evaluate your caliber realistically - again this is hunting situation dependent as well as weight of the gun and recoil but if your set on the caliber then find the absolute best bullet and make that your top of the magazine load.
Study the terminal energy numbers of your caliber/load and know what your getting so that expectations are inline and you don't end up blaming a bullet/load for what the gun was designed to be...
Example: energy at 200 yards for a few calibers -
223 Rem - 663 ft/lbs - 62 grain bullet
6.5 Grendel - 1183 ft/lbs 120 grain bullet
6.8 SPC - 1059 ft/lbs 115 grain bullet
6.5 Creedmoor - 1717 ft/lbs 140 grain bullet
308 Win - 1832 ft/lbs 150 grain bullet
300 Win Mag - 2659 ft/lbs 180 grain bullet
338 Federal - 2304 ft/lbs 200 grain bullet
So simply looking at numbers above - I would venture to say that your caliber (6.8 SPC) has good energy to be effective when shots
ARE NOT placed (pin-point) in an already effective location. So outside of the SST being a better bullet than the S&B if you're still seeing hogs run after being shot then take a look at a higher energy caliber.
By the way hogs don't care what the numbers say and will run regardless of caliber BUT if we want to be technically accurate and do our best to use the right tool for the job then we have to at least know the baseline.
Note: I am so cheap (frugal/miser/tightwad) that when I watch hunting videos where the Hunter explains the bullet/ammo choice that I find myself shaking my head when follow up shots are being launched using 3.00 per cartridge ammo. It just baffles me.
So with that said don't take any of the above as a criticism of any particular caliber or ammo but rather just my designs and manipulation of data which allows me to sleep easier when spending my hard earned cash on ammo.