Rifle Sep-Oct 1971, p. 34 "The bestest brush gun" by Will Hafler
Handloader #132, March-Apr 1988, "The .458x2 in an XP-100" by Joseph Donnelly
The latter article shows max loads in 15" barrel of 400 Barnes, 54 gr IMR4198, 2175 fps (2136 hot barrel); 500 gr. Lyman 457406 cast, 48 gr, 1844 fps.
