JSB MKII 33.95 grain slugs

Although I am not shooting anything as heavy as you, I have been testing NSA along with H&N slugs with good results and at a much lower cost.

Depends on caliber. I use them in my RAW 25 cal and Maverick at about 900fps

That is the best slug in my taipan tack , up to 140y+ even when I know for now is going slower than it should be..