10 gauge shooters be careful.
This is taken from the Ballistic Products website for new 3.5" 10ga federal hulls they offer for sale. This is the new federal primer I thought I had heard about.
"Federal 10-gauge new hulls primed with a Federal 239 primers and ready to load. Limited run of hulls now available from Ballistic Products. The Federal hulls are used for almost all current load data in lead, steel, bismuth and Hevi-shot. Brown, skived. 50 per bag. Note: ***The Federal hulls in 12-gauge 3.5" and the Federal 10-gauge hull new, unfired hulls are made with a new primer. This is the FED239 primer. A string primer designed to give a boost (firm start) to ALLIANT STEEL propellant and other slow burn rate powders utilized in heavy loads. (Thus far, the FED239 primer has not been offered as a reloading component.) It has been found that the FED239 elevates pressures with some of the older loading data which calls for the FED209A primer. Until specific reloading data is generated, on first firing of these hulls made with the FED239 primer, the reloader is advised to reduce the load propellant amount by three grains."
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