Yep... and just to prove pioneer461's point, Remington Thunderbolts are the absolute worst-shooting cartridge my old Marlin Glenfield 60 has ever eaten. ...or rather, tried to eat. They just do not shoot well at all. Never have. Definitely buying the smallest quantities is the cest way to go; I ran out and bought a 500-round brinck of the Thunderbolts just because they shot so well out of my brother's Marlin Glenfield 60 that he bought on the same day at the same time from the same store that I bought mine. That's even further proof of what pioneer461 wrote. Funny thing was, right after that, my brother pretty much stopped shooting altogether and I had no one that I could dump them off on. So, it was miserable. I never enjoyed a shooting session when shooting those. Every 3rd or 4th shot, at least one and sometimes as many as 4 or 5 in a row would jam. I kept blaming the rifle but it shot other stuff (copper-jacketed, mostly) like a purebred champ.
I don't shoot that rifle as much these days as I used to, but it still shoots well. Many a woodchuck has fallen to that rimfire over the past 32 years or so. Ditto that for cans and other plinking objects. Good luck with yours!
"These are the times that try men's souls. The summer soldier and sunshine patriot will, in this crisis, shrink from the service of his country... Tyranny, like hell, is not easily conquered. ...A long habit of not thinking a thing wrong, gives it a superficial appearance of being right, and raises at first a formidable outcry in defense of custom. Time makes more converts than reason."
~ Thomas Paine, January, 1776, from "Common Sense"