And science fiction...
Reading about the travails of the developments that lead from the 1:14 on the AR-15 R601 through today's 1:7 M855A1 and Mk 262 I wondered about a few things.
The change from 1:14 to 1:12 was brought about by testing outside a tropical climate. The air was just too thick for the 55gr round that becomes the M193 to stabilize turning once every 14 inches.
Likewise 1:9 was the original twist for the SS109 round. A pity then that the L110 wouldn't fly straight when fired through the soup that passes for air in northern Norway in January.
This got me to thinking...
We're talking about a change in temperature here and not a change in the composition of the gases. It's still air in both Norway and Vietnam.
What do you do when the partial pressure of a given component is different, and it should be from world to world. A gun that fires fine on Earth might not on Bootes IV just because the density of the atmosphere is too different.
Also the effect of differing gravity on the sights....
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