how to solve the .22LR transonic threshold problem
over in ATE 11b6r posted this:
what say ye
fascinating, I didn't know that. can't get around the laws of physics or aerodynamic engineering, but to solve that problem, why don't they use boat-tailed 22LR bullets, or with some sort of twist marks on the heel to allow the hypersonic pressure front to slip off the heel of the bullet without disturbing it? or what else can be done.11b6r wrote:For MOST 22 LR, 75 yards is the magic number. With the exception of Match ammo, MOST 22 LR, fired from a rifle, is supersonic- out to about 75 yards. As it drops back into subsonic speed, the shock wave that HAS been on the nose of the bullet is sliding down the bullet. As it drops off the heel of the bullet, it sorta flicks the base of the bullet, giving it a bit of yaw- and accuracy goes to crap. MATCH ammo is subsonic from the muzzle. More accurate, BUT trajectory is a very pronounced arc, holdover is significant. A 50 yard zero becomes a 6 inch holdover at 100.
If you are shooting for the top of a bowling pin, you are MUCH more likely to hit it with a 44 mag IF the 44 is traveling entirely super or entirely sub. It is not just the width of the bullet, but the inherent accuracy of the rounds. Which is why .22 matches are shot at 50 yards, and not 100.
For everyone that wants to tell me about the incredible accuracy of their 22 at 200 yards, congratulations on finding a way around the laws of physics. Please save your flames for later in the fall when I can use the heat.
what say ye
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Maybe the boat tail would work in a 22 mag. I'm not sure the heeled bullet in a 22 LR and the way it is crimped in would facilitate a boat tail design. Seems like where the crimp is would still leave an edge for the wave to flick. Just my 2 cents. Bob 0 -
This happens to all projectiles but it was a great response to the question. 0
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