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.45 ACP
Take it to a gunsmith for verification.
The JC Higgins Model 20 is a well-made firearm. Provided you have it checked by a competent gunsmith, it can handle any standard 12ga 2 3/4" shotshell. If the gun is not choked 'FULL' you should be able to use slugs.
.45 Long Colt.
Winchester 32 spl 170gr
read top of barrel. it will tell you the caliber bullet it shoots............
It depends on what kind of ammo.
Your marlin should be marked on the side of the barrel as to which type of 22 ammo it needs.example of 22 short,22long.22 long rifle,22magnum.
the m16 uses 5.56 caliber ammo
this ammo is one of a kind. it will only fit a remington 16 22 caliber autoloading rifle. the model 16 was the very first 22 cal. automatic remington produced. they made this special ammo. because all prior 22 ammo was blackpowder. the model 16 was gas opperated and black powder would plug and corrode the gas tubes. thus the 22 cal. autoloading. this ammo was made to fit this rifle and this rifle only. it was a 45 grain bullet that would average 900 fps. this round fool proofed the model 16.
You need to see a gunsmith to make sure what it is chambered for.
what kind of pistol is it?