How long is his barrel?
I've just done some load development for my Dad's model 7 with 18.5" barrel.
Wanted to run 100g if possible, and wanted to get keep reasonable velocity from the short barrel.
Ended up using 7828ssc. 47gr shoots well with 95 SST and 100 sgk's.
http://youtu.be/FpVPrzeRfqE
Here's my 74 yr old Dad shooting it.
If yours has a standard length barrel 2209 is probably the better powder to use.
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