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Thanks! I've got to find some N110. I know people complain about pricing but looks like a great metering option to try given my situation..
Great post, iff'n I ever go to he dark side of 300BO, I will refer back to this.Oddly enough, this isn't actually true. When you're dealing with subsonic bullets, you're not dealing with any nose pressure drag (shock-wave) as such your drag function becomes a function of the surface area that's exposed to the air stream. On a .30 cal long ogive bullet.
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Here's something the germans did in WW2 to work with the L31 suppressor for the MP40, it's a heavier weight bullet with a similar form factor, but a rather noticeable tail sticking out the back.
In a design similar to this, the whetted surface area would be lower, due to a transition from laminar to turbulent flow where there is a transition from the skin to the back of the bullet. However these were 9-gram bullets since they were "eisenkern" (iron core) which was cheaper than lead, which gives it a weight of about 140 grains.
The other thing that's interesting to this conversation, a 9mm has an approximate parabolic ogive, which is actually almost ideal for a sub-sonic projectile. (there's a table on the "nose cone" wikipedia page) Nose cone design - Wikipedia, the free encyclopedia
By comparison, the tangent or secant ogive rates as terrible just about anywhere it's tried. If you look at some of the modern missile designs (SLBM's especially) they use aerospikes as a way of moving the shock and friction drag forward of the main cone. But this kind of technology isn't really practical in small arms designs.