We have plenty of 2.75" and 3" 00 or 1 in Stock most of it is copper plated not nickel. We have Remington, Federal, and Winchester.
Before anyone starts asking we don't have any 22, 22 WMR, OR 17 HMR.
The nickel plated buckshot that Remington used to load as a Premier line of shot shells, was the tightest grouping hardest hitting buckshot available. I know it hasn't been available in stores for some time. I was hoping that maybe someone may have some sitting around in the gun cabinet they might wanna get rid of.
found they make a #4 Fiocchi #: 12HV4BK Midway carries it but out now
Give Federal Premium a look, it might meet your specifications. I think the factory data calls for 1325 FPS muzzle velocity on that, and it's a 9-pellet 00 load. It's also loaded in a FliteControl wad that generally does wonders for patterns.
Hornady TAP FPD (red hull) has unplated shot but it is hardened. It too is loaded in the FliteControl wad, it's an 8-pellet 00 load at 1600 FPS per the factory. It's what I'm now using, it works well in a variety of guns. Note there is a reduced recoil (blue hull) load of Hornady TAP as well.
All I found, there is a new poly coated but the nickle must be not being made anylonger