Small firing pin?

[jlmurphy]

What are the advantages of a small firing pin versus a large pin when used on small rifle primers?

 

[Dusty Stevens]

The pin fit relative to the hole is what matters most. If you do the calculations of the surface area of the smaller hole itll hold a lot more pressure without blanking primers and some ctg have a very fast spike that needs the smaller area (6.5x47l for example) so most just do the smaller pin when bushing the hole

 

[Mulligan]

This video explains a bit of what you are asking
CW

 

[Hummer]

You are very likely to get punched primers using small primers and hitting them with large striker diameter. Seen it happen many times.