Can't go wrong with either a 1 1/8 or a 1 oz shot load pushed by 3 drams equivalent of powder. That will provide about 1200 fps. Most manufacturers will have those loads in either 6 or 7 1/2 size shot. Just shoot them in the head.
A 1 1/8oz 3 dram load has been the standard trap load for over 100 years, and for good reason. The high velocity loads made by some manufacturers are designed to compensate for lack of lead allowance, but because high speed loads lose speed quickly, at typical game ranges of 35-40 yards for pheasant, the difference between a high speed load and a 1200fps load is small, around six inches, at the expense of added cost and added recoil.
For target shooting, many shooters use lower recoil loads of 1 oz or less and 2 3/4 dre powder.
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