So just how many days did it actually take for CW Rowland to shoot that one group. And did he actually do it outside in the actual conditions for a given day. Or in a more protected place for him to be able to accomplish it over more than just one day?

Since Rowland mentions weather conditions, it would seem it was shot outdoors. Rowland did some testing an a mine he had access to for shooting when the weather was poor. But it seems his record group was not shot in the mine.

Any guess who the shooter was to beat Pope’s target with any rifle, J Borton was probably the first with a cast bullet rifle, D Reynolds brought the group down farther, and J Schultz shot a .634 this summer. I don’t remember any better 10 shot groups shot before the mid fifties.   Ledball

This is an old thread that pertains to Mr. Rowland as well as his load; 

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Might also add there was a real good write up about these three who have all surpassed CW Rolands group size. 
You can find it the Single Shot Rifle Journal, July / August 2012, Vol. 65, No. 4.

???? Not sure what it is you are asking as there are no 
similarities at all between the two.

The October 1902 Outdoor life article written about Rowland's record group states the following"
"The load used in making the target was 3 grains of Dupont No. 1 smokeless, 7 1/2 U.M.C. primer, and the shell nearly full of Hazard Fg powder, making a bulk charge of about 46 grs. Before using the powder was carefully sifted through several sieves to perfectly sure that it was of even grain. Bullets were cast 1 to 10, lubricated with Leopold's No. 5 lubricant. Oleo grease wads were employed. Rest was a Stevens-Pope No.1 rear and No.2 front, supported on a very heavy wooden frame, deeply seated in the earth, and strongly braced."

So it seems his load was not smokeless as I've seen described in some reports, but a duplex with smokeless priming charge. Which begs the question if anyone has beaten his record shooting BP, or a duplex charge?

marlinguy
Nice job in covering Rowland's load used to shoot this famous group.

Mick B asked about the bullet Rowland used. While I have not come across just what bullet he used, it would have looked about like the one pictured below. That drawing is from a bullet cast from a Pope mold. It weighs in at 185 grains. Rowland would have used a bullet of similar design, likely from the bullet mold Pope supplied with the barrel he sold to Rowland.

Back several years ago while I was researching and writing my book The Golden Age of the American Schuetzenfest, I did a lot of shooting with black and duplex loads trying to duplicate the accuracy achieved back in the day. With good range conditions, I was able to get fairly consistent 1.5 MOA and sometimes close to 1 MOA, 10-shot groups at 200 yards with both straight black and duplex. Shot bench rest of course but not from a machine rest such as Rowland used.