I used to shoot competition in early 1970's and 1980's , before my profession caught up to me. Shot a custom home made .50 , w/ old time early Siler flint lock ,'Cause that was the better lock at the time , late 1970's , through the 1980's. Never experienced any flint problems , occasionally one might break in half , but very rarely. The gun would fire upside down , and only once did it not fire do to damp in a blizzard , due to my carelessness. Storm was so intense the gun was plastered w/snow so bad , I let the snow get ahead of my poor efforts to keep the wet out of the lock. You learn through experience. Had two percussion guns for hunting. The percussion .54 would just take up moisture in the woods just because the atmosphere temperature would change. Back then , I was hunting squirrels with great success using a .36 cal custom self made longrifle percussion gun. I just never liked having to keep the gun stood on end after cleaning it , like I do with flint locks now. I was lazy about that , and the .36 percussion at times was fouled when I needed it. The learning curve finally hit me over the head , and excellent flint locks came out. I haven't built a percussion gun in 30+ years. Maybe I should build one to see if I can do better at using one than before? Sorry for the rambling commentary , guess I'm a flint man..........oldwood