There are several options, Williams Firesight is a good one. I believe the one I put on my "Hog Rifle" is a T/C product.
I found the 1:48 bbl really likes the Hornady "Great Plains" 385 gn conical. I sighted those in over 90 gns of 3f Goex. It's a stout load for sure. Sight it an inch or so high at 50 yds, there's not a lot of drop out to 100, which is my MAXIMUM shooting distance. Bad eyes, coarse sights..A man's gotta know his limitations.
I killed a nice hog with that rifle and combination in October. Shooting from a tree stand as he walked toward me, head down, he was about 20 yds away when I touched her off ...the Hornady bullet went through the Atlas joint ( the spot where the skull meets the spine) and penetrated diagonally through the body, clipping the Aorta at the top of the heart, and lodging in the distal(back) end of the brisket. The recovered bullet mushroomed perfectly, and retained over 90% of it's initial wt.
Good luck with that rifle...!!