It's simple syllogistic logic. If you know that Mausers hold 5 rounds, and you think that a rifle you see is a Mauser, then you are liable to that the "Mauser" hold five rounds.
That's right....Weitzman apparently was familiar with the Argentine Mauser, so he knew that it held five rounds.....This is one of the things that leads me to believe that Weitzman actually had his hands on a 7.65 Mauser. (And that most definitely was NOT on the sixth floor that afternoon. )
I can't even figure out how you're so sure that Weitzman held anything that day. Sayers' report is hearsay, not even a quote. The D/FW FBI team was interviewing an awful lot of people over that weekend, retreating to their offices in the the Federal building, then reconstructing those interviews from whatever notes they took combined with whatever they could remember. Given the workload, exacting accuracy might not be wisely expected.
Who said that Weitzman or Boone or anyone else found a second rifle, separate from the Carcano seen in the Alyea film?
Roger Craig made that claim..... Not that I believe that...I'm just tellin you that Roger Craig said that.
Please, Let's not let this degenerate into petty arguments about the features of Argentine Mausers.... Let's try to come up a reasonable explanation for the FBI report of A1bert Sawyer....and Weitzman's very specific description of a 7.65 mauser.
How can you not talk about a "very specific description of a 7.65 mauser" and not have "petty arguments about the features of Argentine Mausers?"