JUst an opinion.... "mine" anyway...
I started reloading 12ga. shotshells in around 1977 or so. We kind of "pushed the envelope" a bit back then. And, it seems that reloading manuals have lowered the loads a bit since then. I would only suggest ( the opinion) that just because ya have a sports car or a motor cycle that can do 180 mph, it doesn't mean that ya should do it & particularly on a regular basis.... & just because YOU can do it,doesn't mean everyone can do it...
Do as ya like, but it seems to me that there is a certain "personal responsibility"that one takes in "pushing the envelope", and if YOU choose to do it, "yourself"... fine then. Anything happens that results in an unsafe condition, then YOU be prepared to accept the results of your doins.
One other thing to remember is... that if someone else gets a hold of your doins & is unaware of them being a bit "hot" for specifications, or you do not mark to warn, etc.. YOU are the one culpable for the results to others for YOUR doins..
DO as ya like, but be prepared to accept the personal responsibility fro your own doins & not blame anyone else for them.
( I do not & have not reloaded for anyone but family & extremely close friends & I mark the loads that are "pushing the envelope". I suggest ya do the same regardless of who decides to have a bit of experimentation with this sort of thing.
G'luck! to ya'll, regardless...
Please be careful though... If not for yourself, but for any who might not be aware of your doins... Hate to hear of a kid or a grand kid,( whatever/etc) getting hurt down the road, because they decided to go out & use some of "Dad's" or Grandpa's ( et al) old loads, & not knowing those loads are a bit "hot".
Not, "preaching", just putting in my , "2 Cents" in the hopes that no one gets hurt... or worse...