Adler did suggest to Pietta to produce the Capt. Schaeffer Alexandro Pietta wrote that himself.
And I own one of his Table Top books " Metallic Cartridge Conversions "
My opinion however, stims from a first time impression & chance meeting at Shot 07 , where here was book signing his newest at the time picture book "Winchester Shotguns"
He had an elitist attitude I found off putting ...so full of himself,
At the same show the late R. Lee Ermey was ingratiating
Just a personal observation worth no more than its cost