Amazon or Bass Pro Shops would be the best location for one to purchase 177 lead pellets. Each of these stores offers them online or in stores for sale at a variety of price points.
You can purchase .177 pellets at most any sporting goods stores. "Big 5,"' Dicks" or Wallmart just to name a few. As for the age of the Pellet gun you will have to give more information about the "GUN" (It not a rifle?) to determine the age. If you are asking about the model 177 then it was made between 1935-41
A pistol that fires .177 diameter pellets.
No it is not designed to shoot pellets.
.177 cal. Crosman, daisy, rws, beeman, marksman all make pellets in the .177 size
The Crosman Phantom is designed to shoot ONLY .177 pellets NOT BB's, they will ruin the rifling in the barrel.
The medalist is a .22 caliber pellet pistol. You need to purchase .22 cal pellets not .177 cal pellets. you can find them at most large sporting goods stores.
Daisy is not known for making match grade pellets (waddcuters) personally I would not use them but they could be sold about 1/3 the store price of $4.49 so the would make it $1.49
You need to consult your owner's manual. Some BB guns can shoot pellets, but some cannot.
The Crosman model 761XL is designed to shoot BB's or any .177 Caliber pellet. These are the most common pellets you can find. Make sure you select .177 Caliber pellets.
As long as the pellet is .177 Cal then any .177 caliber pellet will work in your .177 Gamo.
I suggest: JSB diabolo, Crosman premier, predator polymag see: http://www.pyramydair.com/pellets
4.5 mm and .177 Cal are the same size. It's just two different units of measurement. Millimeters verses Caliber.