I am an ole retired US Naval Aviation AMSC. Have shot and bucked a zillion rivets in my day. But, We rarely used blind rivets on aircraft.
When shooting blind rivets. The length of the rivet in ratio to the thickness of the material is going to govern when the shaft will break off. I hope a cross reference chart came with your rivet kit. If not, you may find one on line.
US Naval Aviation AMSC 20 years ( retired) ASW/Aircrew Wings, P2V plane capt. Also a Tail hooker, US Naval Academy (DI) Shooting Instructor (Annapolis) NDW shooting team member. VN vet, Bluenose and Shellback.
Alway keep your six covered