Jeff Siewert

So there's really two types of stability that we worry about for rifle and handgun bullets.

Gyro stability, is there enough spin to keep the pointy end forward?

And then lastly, dynamic stability, does any initial yawing motion decrease with the bullet going down range?

Okay.

And so across the top, I've got different land and groove diameters.

And down the far left-hand column, I've got the twist in inches per rev.

And the table is filled out in twist in calibers per rev.

And most ballisticians are going to talk calibers per rev.

So the stuff in the red is kind of really what I would consider to be very low twist, low calibers per rev, very slow twist.

It's high number of calibers per rev.

So that's a very lazy twist, if you want to call it that.

And then as you get to the yellow, it's a little bit faster twist.

The brighter yellow is faster yet.

And then the light green is faster yet.

And then the dark green is the fastest thing out there.

Okay.

And so it just gives you an idea.

You know, people talk inches per rev inches per rev.

If you're talking different calibers is totally confusing.

You need to talk calibers and compare across different board.