Tom Roster:
There has been imported into this country for years electrolysis process, nickel-plated lead shot from Italy for reloading and in certain Italian-origin factory lead loads. The plating is excellent as is the sphericity of the lead core. Unfortunately, these pellets have universally measured quite low in antimony in my tests. The end result to any lead pellet with a low antimonial content, whether plated or not, is to suffer a high degree of setback deformation during combustion.
Layne Simpson:
Adding antimony to shot makes it harder, and the more antimony added up to a point, the harder it becomes. The harder the shot is, the better it is able to resist setback deformation during firing, .....
Bob Brister:
The modern plastic shot cup wad protects shot from barrel-scrubbing deformation, but not from ignition setback, forcing cones, and choke pressures ------------ Hard pellets can resist such pressures; soft ones may deform, particularly rearward rows of pellets at the time of ignition. .
SRH
