Many of the pre-WWI varmint rifles started at the Schuetzen range.  When Niedner brought out his high-speed .22’s they were for Schuetzen shooting, after they were bared from the Schuetzen range they took them chuck hunting, the rest is history

 
This rifle, the same one Dr. Baker is holding in the above picture was re-stocked in the late 1940’s or early 50’s, I wish they had left it as Dr. Baker used it but that’s they way things go. 

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But it was a good thing they were cobbled up into Schuetzen rifles???

It may look like a cocking knob from a Springfield but it is not.  A.O. Niedner made a new, wider breechblock for the B-O-R-C-H-A-R-D-T and removed the camming plates.  In order to install double set triggers (DST) in a Borchardt the safety has to be removed.  This is fine for a target rifle but not one used for hunting.  Zischang who specialized in the Borchardt made a safety for his hunting rifles with DST’s that was incorporated into the front of the trigger guard.  With this Niedner conversion, you load the rifle and when ready to shoot, cock the knob until it sets then set the triggers.  It’s been years since I had it apart but if I remember correctly the firing pin “floats” off the primer when the cocking knob is down and inertia carries it forward when fired.

MP,

Speaking of safety variations. My friends Luft Bros. built Borchardt, has the safety relocated to a sliding tang safety. I don't recall if it was merely to unclutter the trigger guard, or to make room for a set trigger. I'll have to ask him. Like my Hartung conversion, his was a rework of a military action, so no harm done, and it makes a very fine hunting rifle. His is chambered in 9.3X74R, which is a real favorite of mine. This Luft rifle, is at the opposite end of the spectrum of the varmint guns discussed here. It could be used(and the 9.3 has been used) on basically any game on the planet.

Jeff