I understand that you're a newbie to muzzleloading, but asking that question about them bullets will bring out that reaction no matter where you ask it.
Like Shorty said, they will kill a deer, 90% of us ( including me ) used them in the very early stages of our muzzleloading experience, but as soon as most of us discovered they either don't perform ( open & expand ) or they grenade on impact, we quickly left them where they belong & started looking for better bullets. They are a cheaply made, overpriced, plated bullet. I shot them for a decade, not knowing any better & they were avail in every store that carried any muzzleloading supplies. I gave away the last 5 or 6 pks that I had. I said this o FB recently regarding them; the only ppl that say that PB's are " good bullets " are ppl that have no clue as to what a well made, bonded cup & core bullet are & how they should perform. Of course some of the PB fanboys got butthurt about it, but it does not negate the fact that every single word of what & said is 100% true & that it wasn't a slap in anyones face.