The only reference I find to 197 is as a high pressure proofing round. Do you have a source or citation for this claim?
Hague Conventions addresses not the Geneva Conventions.
See Laws of War : Declaration on the Use of Bullets Which Expand or Flatten Easily in the Human Body; July 29, 1899
http://avalon.law.yale.edu/19th_century/dec99-03.asp
A catchall phrase was added in 1907 on address additional concerns in the Second Hague Convention.
Laws of War : Laws and Customs of War on Land (Hague IV); October 18, 1907
Section II, Chapter I, Article 23
"To employ arms, projectiles, or material calculated to cause unnecessary suffering;"
http://avalon.law.yale.edu/20th_century/hague04.asp
The later 1928 Geneva Protocol only addressed Chemical and Biological weapons.
The earlier Geneva Conventions dealt with the treatment of people in war, not armaments.
From Infogalactic
"Conventions
In diplomacy, the term
convention does not have its common meaning as an assembly of people. Rather, it is used in diplomacy to mean
an international agreement, or treaty. The first three Geneva Conventions were revised, expanded, and replaced, and the fourth one was added, in 1949.
- The Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field was adopted in 1864. It was significantly revised and replaced by the 1906 version,[15] the 1929 version, and later the Fourth Geneva Convention of 1949.[16]
- The Geneva Convention for the Amelioration of the Condition of Wounded, Sick and Shipwrecked Members of Armed Forces at Sea was adopted in 1906.[17] It was significantly revised and replaced by the Fourth Geneva Convention of 1949.[18]
- The Geneva Convention relative to the Treatment of Prisoners of War was adopted in 1929.[19] It was significantly revised and replaced by the Fourth Geneva Convention of 1949.[20]
- The Fourth Geneva Convention relative to the Protection of Civilian Persons in Time of War was adopted in 1949.[21]
With three Geneva Conventions revised and adopted, and the fourth added, in 1949 the whole set is referred to as the "Geneva Conventions of 1949" or simply the "Geneva Conventions". The treaties of 1949 were ratified, in whole or with
reservations,
by 196 countries.
[1]"
https://infogalactic.com/info/Geneva_conventions
Want to play around (see the equations) with the math and physics of barrel twist and some considerations about different variables affecting projectiles,
http://www.fulton-armory.com/\faqs\AR-FAQs\ARTwists.html
From what I remember, the original 1:14 twist was moved to 1:12 due to cold weather testing in Alaska.
Here is a decent conversation dealing with AR twist rates and projectiles on an AR forum
http://www.m4carbine.net/archive/index.php/t-35029.html
