it is sad that the increases in powder pressures, resulting from the deveopment of better ways to kill each other is one of the negative results of ww1...
apparently this change in powder technology carried over to post ww1 shotgun loads as well...resulting in preww1, light guns, such as many ithacas to develop mechanical and reliablity issue that were unknowm prior to ww1 and before the new higher pressure powders came into common use for factory ammo...
and this is why so many fine side lock guns also suddenly started to show fatigue issues...
like the wise man said...an ole hoss can only take so much abuse, before it breaks down an quits on you...
