Again, with the paraffin testing, it's a non-issue. It even came up partially positive.
I believe it is the Warren Commission and the FBI experts who have some reservations about the palm print found on the gun.
Fibers from Oswald's shirt are found on the rifle. Likewise on the box too.
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"The FBI tests of the Mannlicher-Carcano's accuracy showed that the rifle was:
1) Inaccurate from 15 yards.[10]
2) Carrying a scope that was mounted for a left-handed person (Oswald was right-handed).[11]
3) The rifle was unable to be "sighted-in", using the scope, without the installation of 2 metal shims (small metal plates) which were not present when the rifle arrived for testing, and were never found.[12]
During efforts supervised by the FBI to duplicate the shooting accuracy allegedly achieved, no FBI, military or civilian (National Rifle Association) expert was ever able to match Oswald's performance. No tests have ever been made using Oswald's rifle in the condition in which it was found.[16]"