I would like to identify the engravier on my rifle. It is a engraved Mauser 458 win mag. It’s marked Custom built by Frank Pachmayr here are some photos.
Maybe Roger Bleile will know.
But it's going to be difficult.
The Pachmayr shop had many different engravers do work for them.
They sent some guns to Germany for engraving.
They also had visiting Japanese engravers and some resident Liege trained engravers do some of their work.
But what scrollwork I can see on these does not look like German or Japanese style to me.
I fully concur with John's comments above. The only American engraver (that I know of) employed by Pachmayr was Richard Boucher who signed some of his work "BOUCHER." Their go-to engraver in Germany was Erich Boessler. He signed with a tiny EB. you will see in the image below that the style of scroll looks nothing like yours but Eric was very versatile and could work in several styles. His mark is just below the deer's front feet.