Field Grade Remington Lead BB shot is still avaiable in 25 lb. bags.
https://www.precisionreloading.com/c...!l=RM&i=S23870
The old Remington 2.75" Express loads held roughly 62 pellets in a 1.25 ounce payload. The nominal .18" pellets weighing approximately 8.8 grains each.
Edit: "Remington field grade shot contains 2% antimony."
This antimony level is not sufficiently high to harden shot or buckshot with heat treating.