1:9 twist ?

[ewspears]

bayou shooter,
You said; "The reason we need to statically stabilize bullets by spinning them is to counter the overturning forces produced by air resistance."
I'm sorry but that is not correct!!!!
I'm a retired aerospace engineer and don't want to get into an engineering debate with You here but if You just think about childhood and when You spin a top on a flat surface and it would be perfectly stable at first but then as the RPM decayed to a certain point it becomes unstable and spins out. A given top will become unstable at a given RPM repeatably! Air resistance isn't a factor since other than rotational the Top is stationary!

 

[Turbulent Turtle]

I don't think we are talking about the same thing here. Your top example is not applicable.

 

[ewspears]

The Top example is absolutely Applicable!!!! I have to wonder about your engineering background!
Last post with You on subject!

 

[moorepower]

I would be shocked if it won't stabilize a 75 bthp, if it is a non vld. The 75 Amax might not .

 

[FroggyOne2]

And so the debate continues!

 

[amlevin]

I bought 75 grain Bergers for mine but loaded the 73 grain bergers first and haven't bothered with the 75 grainers. the 73 grain shot so good I aint going to waste the time.

Had the same experience here. The 73 gr bullets find the same part of the target just as if they were "wire guided".

In my 1:9 20"bbl *SPS-Tactical", I found that the 73's were max for reliable accuracy. Some 77gr's just weren't accurate at all.

 

[CatShooter]

bayou shooter,
You said; "The reason we need to statically stabilize bullets by spinning them is to counter the overturning forces produced by air resistance."
I'm sorry but that is not correct!!!!
I'm a retired aerospace engineer and don't want to get into an engineering debate with You here but if You just think about childhood and when You spin a top on a flat surface and it would be perfectly stable at first but then as the RPM decayed to a certain point it becomes unstable and spins out. A given top will become unstable at a given RPM repeatably! Air resistance isn't a factor since other than rotational the Top is stationary!

It the top on a table is not applicable. A bullet has two degrees of freedom, the top has no degrees of freedom, and is a poor example of anything to do with bullets.

The top starts to wobble because the body looses energy and precession causes it to rotate around the axis of acceleration (which, in the case of the top, is vertical).

If the top were in free space, or free fall, it would not behave in the same manor.