doublegunshop.com - home Forums General Discussion Classic & Custom Single Barreled Sporting Rifles @ doublegunshop.com M70 sight project

Mike,
Interesting, do you have the measurements for your friends cartridge?
I believe they are most likely similar. The 358 Norma Mag, 358 STA, 358 Entekin and the 35 Zimmerman probably have more similarity then differences. I never knew Mr Zimmerman (I believe his first name was Bob), who was a tool and die maker, did make his own chamber and sizing die reamers for this gun. It is my understanding that Mr Z wanted what he called the ultimate long range Elk gun. He made one rifle for himself and then the reamers were used for my rifle. I would imagine as Mr Z was designing his cartridge, one has to believe he was veting the available information on other designs and may have used some of Mr Enterkin's data if available. Did Mr Enterkin publish any articles or information concerning his cartridge design?

LRF,
I have some drawings in my gunroom in the basement, but we are getting ready for a family Christmas for lunch, so It may be a while before I can pull them out. Without checking the precise measurements, I think the front part matches pretty closely the 358 Norma. This makes sense, considering when they were developed. The first time I met Gene, in 1969, he told me about this cartridge, and told me the idea came to him in a dream. Maybe the newly introduced 358 Norma was on his mind. Gene was a shooter and was Commander of the Marksmanship Training Unit when I met him, he always preferred long barrels, because of this. I believe that is why he achieved over 3000fps( actual chronograph readings.no "corrections" for muzzle vel, elevation, rounding off, or anything), while others did not. I am curious of the barrel length of the 35 Zimmerman test rifle, do you know this? If you will PM me your mailing address, I will send you photocopies of the report of the initial test demonstration, cartridge drawings, testing reports for the bullets, loading data and other promotional material.
Mike

PM sent.
Barrel is 24"

I received it, thanks.
Mike

Mike I got your letter and I responded in another PM