From Midway USA
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=417403

Quote:
Federal Vintage Gold Medal Ammunition 12 Gauge 2-3/4" 7/8 oz #7-1/2 Shot Box of 25 (Not for Use in Semi-Autos)

This vintage ammunition was produced specifically for MidwayUSA to the following specifications:

7/8 oz shot, 1200 feet per second velocity, 5,000 pounds of chamber pressure

These specifications were designed to be kind and gentle to all older break-open shotguns that are safe to shoot with modern ammunition. This ammunition is also ideal for trap and skeet practice, or for use as a light game load - wherever a 20 gauge load would be acceptable. Perfect for lightweight game guns, for youth shooting or for anyone sensitive to recoil. Will not cycle most semi-auto actions.


When you click Technical Specifications & Use the above is repeated with this addition:

Quote:
MidwayUSA does not claim or guarantee that this ammunition is safe to shoot in older guns, or any gun, for that matter, and we recommend that you have any older gun examined by a competent gunsmith or other authority before firing.


This is the only gauge, length, loading that they carry. They are selling them by the box-$6.99 and flat-$64.99.

Pete