"Fox and others went over the Custer site with metal detectors, finding shell casings and fired bullets to arrive at this list."

"The arrows used were all metal tipped."

They cannot make that second statement with any degree of certainty, If they went looking with a metal detector all they would find would be metal tipped arrows.

Otherwise what is said is of no great variance to what has already been said. SRS's "starting point" gives a far more detailed breakdown of the weapons used on each side, including the weapon return registers of Crazy Horse's band. The 1873 Model Springfield was sighted in somewhere between 500 and 600 yards. It's Maximum Effective Range (2% change of causing material damage) was 1000 yards. The Repeating rifles that the Indians had were said to be good for 250 yards and difficult to reload.

From what you have posted no credance at all seems to have been given to Reno or Reno's men's statements regarding their rifles jamming. Subsequent to the action the 4th Cavalry which relieved the 7th insisted on being equipped with Repeating rifles because of the lack of confidence the troopers had in the Springfield.