Gyroscopic stability factor

[ashcroft]

I was fortunate to attend a day's shooting with Richard Utting last year and he talked about the above using Strelok pro data to produce figures for my rifle to consider heavier bullet options

For the life of me I can't remember what figure i should be using.

I recall above 1.5 been a minimum but thought there was a higher number to stay under also

Can anyone in the know offer advice?

[Popsbengo]

https://bergerbullets.com/the-state-of-the-art-in-rifle-bullet-stability/

This should explain everything and their calculator is excellent

 

[Akeld]

https://arxiv.org/ftp/arxiv/papers/1410/1410.5340.pdf

[ashcroft]

Thanks chaps, so basically reading those it is to stay between 1.5 and 2 with theor being no indication If anyone is better as long as in that banding. Thanks

[Popsbengo]

over 2 is ok (but not optimum) as long as the bullet can withstand the forces

[VarmLR]

Litz's Appied Ballistics for LR shooters has a very useful and comprehensive table of gyroscopic stability factors in the tables within the book.  It lists  advocates anything  1.4 and above is good.  Above 2 with some bullets you can run into problems with jackets coming apart in the barrel depending on bullet construction, so as pops says it'll depend on the bullet.