From a 2009 posting
In true International (Olympic) competition, the following quote from the ISSF rules will apply.
9.4.3 AMMUNITION
9.4.3.1 Cartridge Specifications
Cartridges permitted in ISSF competitions must meet the following specifications:
• case length after firing must not exceed 70 mm
• shot charge must not exceed 24.5 g
• pellets must be spherical in shape
• pellets must be made of lead, lead alloy or of any other ISSF approved material
• pellets must not exceed 2.6 mm in diameter
• pellets may be plated
• black powder, tracer, incendiary, or other special type cartridges are prohibited
• no internal changes may be made which will give an extra or special dispersion effect, such as the inverse loading of components, crossing devices, etc.
However, I believe a relaxation of those rules have been allowed in the USA for some shoots, such as local and regional competitions. I think in those cases, a full 7/8 ounce load can still be used. When it gets to the team selection competitions, I believe the ISSF rules kick in and the true 24 gram loads are required. I don't have access to a USA Shooting rule book to verify this for sure, but thats the way it was a few years back
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