My experience with the 300 Blackout also as quite a few pigs just ran off.
But, we are talking about the 458 Socom so....
I'm on my second one.
The first one had a copy-cat barrel and finally worked right after lots of work.
For my second one, I did my research and bought a barrel and matched bolt from Tromix, the guys that originated the 458.
I machined the ejection ports on the receivers on my Bridgeport using the Tromix specs.
I slapped it together and it worked right out of the box.
I primarily shoot 250gr and 325gr Hornady tipped handloads for hogs.
I shot 6 of my 74 pigs with it last season but none got very far.
I have carry handle/iron sights on it now and use it as carry gun on my 4wheeler.
They are known as optic killers and am pretty sure an XSight will not live long on one.
Make sure you use a solid stock, quite a few adjustable carbine stocks will collapse when fired and get one you can put a 1/2" soft butt pad on.
The Ace Skeleton works well for me - see pic at bottom.
Since my volume of pigs has gone up considerably this season, I'm back on my 6.8s.
I have three with ARP barrels setup for hog hunting and use them more than the 458.
One is setup for day and two for night with a Photon and a N750.
It's fun to take friends and family on their first night hunt!