From what I've seen, Parker didn't use 7 1/2 shot until much later. They used primarily 7 or 8 shot unless the customer specified differently in the order. Shot sizes for 7 shot varied greatly. Tatham 291/oz, NY Lead Co. 278, Merchants Shot Tower 225, Dubuque 323, etc. So you can see nothing was standard in the early days. Since most of the time the LH barrel was choked full from the company and the pellet count is only 170 my guess is they were using a 24" circle at 45 yards but it's only a guess since the stock book for this gun is missing.
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