>>64020853
might be that they make them weak, but firing pin shape is important, they are meant to be somewhat shock resistant so a hammer isn't a good test impact. there are various tips to give them a little more kick, or increase sensitivity, add a little smokeless powder or ground glass. i don't have any first hand experience, i can just buy primers at garage sales. there is endless reading on the subject if you think that might be a way forward.
https://castboolits.gunloads.com/showthread.php?182089-can-you-make-priming-compound/
https://forum.308ar.com/topic/20421-reloading-primers/
there is also the possibility of pic related, or you may have to look into suckboytony's printed black powder gun.