As one of many who has actually shot a lot of materials, in actual settings -read: not just bldg materials or auto glass/winddhields "drug" out to a range, but inside the actual house, or while still attached to the car, they do react differently...
Screw the handgun, gimmee slugs from a 12 bore or a Model 70 in '06. "I done Kilt me a 280Z and Trans Am" ( wind/back steep glass amongst others)
I can't shoot my vehicle if a perp is driving away while stealing it here in my state.
I have shot sitting from inside to outside a vehicle like mine through the passenger side glass to see what works if I need to protect myself if I get boxed in , shot at , and need to defend because "I'm in fear of my life" tho'.
I wonder if Smoke ever made me that IWB holster for a 870 pump...I could have sworn he was going to work on that for me.
Sigh...
In the meantime I know what works out of 1911, BHP, Keltec P-11, a J,K, L, N frame, and similar - etc...calibers 45ACP, 9mm, 38spl, .357, .44spl, 9x23, 38 super, .480 Ruger, 44 mag...
Standard pressure ammo with properly proven designed have proven themselves. Not only for me...others before me as well.
For instance...did ya know...
A 148 gr Target WC and 158 gr LSWC from a J frame snubby will go through a passenger glass and through a mattress. So will a standard pressure 200 gr lead SWC out of a 1911. The 1911 230 gr FMJ was a given, did it anyway...yep it did.
Okay maybe I'll never have to shoot through a passenger glass , through a mattress , and through the door of a Jesus Bus 35 yds away...if I find myself in need that 44 mag or .480 Ruger with whatever the hell handloads that were "mild" would be kinda nice to have handy. oops.
[he said these were "mild," I then shot the "bit hotter" loads...oh boy!]
Using Enough Gun means Use Enough Ammo.
Does not have to be tricked out, +p, +p+, or some weird unobtanium material or shape. Lead is amazing stuff. Shot placement, relies on reliable ammo in said gun, and POA/POI is highly recommended.
Old salvage / junk yards , used with permisson are sooo educational....
Old houses , new construction sites are fun too...with permisson...shooting guns in the house....oh boy!