It might need cleaning. It might need new springs/parts. You may need to switch brands of ammunition. You need to take it to a gunsmith for evaluation.
what shells can be used in a browning 16 guage autoloader
gun powder
Browning did not make ammunition. They contracted another company to make it for them.
yes
It will shoot any type it is chambered for.
Yes, if so marked
You need the services of a gunsmith
Varies according to caliber.
Give it a thorough cleaning.
You need the services of a gunsmith
You need to see a gunsmith.
Not sure excactly what the question is. All Browning Sweet Sixteens (imported to Browning) after WWII are chambered for 2 3/4 16ga shells. The barrels are mared as such. Prior to 1941, Sweet 16's and Standard 16's were chambered for 2 9/16" shells.