Ideal Weight Bullet/Boolit for .300aac? Barrel Twist???

[possom813]

.300aac/blackout with 16" barrel and 1:8 twist.

I'm still learning about barrel twists, and how they effect different weights.

I'm not attempting to go subsonic, just a good, all around, hunting boolit.

I have 150 and 180gr j-words, and cast boolits, gc'd and non-gc'd.

I'm just looking for an idea, or information on barrel twist and how the different numbers effect different bullets.

[Chicken Thief]

As you can see 1/8 is way overkill.
http://i295.photobucket.com/albums/mm153/Chickenthief/Skydning/Til%20andre/maxlength_zpsafeb2bf8.jpg

My Winnie 30-06 in 1/12 shoots the Lee 300AAC boolit just fine.

[Chicken Thief]

The data can be confusing but theres a reason for the "madness".

Theory behind the calcs are shown in the Wiki site.
http://en.wikipedia.org/wiki/Miller_twist_rule

The inputs are rather simple.
Bullet diameter
Bullet weight
Bullet length
Twist rate
Muzzle speed

All will influesce on the others but it will say if a given bullet will go in a given twist.

Here is the spreadsheet
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0CEkQFjAD&url=http%3A%2F%2Fwww.bkmorrow.com%2FWestCoastTacti calRimfireLeague%2FLinks%2520and%2520files%2FTwist _formula.xls&ei=vDROUfubNMfntQb_7YH4BQ&usg=AFQjCNEdPvP1v3Dn09UJQRjWwR_oA_6lkg&bvm=bv.44158598,d.Yms

In short:
Bullet length and bullet weight has a great influence on stability. But speed is also a factor to be reconed with.
Save a copy and play around with it.

[Chicken Thief]

Let's take the 300 AAC from Lee.
From my alloy it weighs 221gr.
It is 1.362" long and .308"
My Winnie has a 1-12" twist and i want to shoot @ speed of sound.

As you can see is 1100fps a tad slow and 1600fps gives enough stability

http://i295.photobucket.com/albums/mm153/Chickenthief/Skydning/Til%20andre/Winnie1_zpsdff3b54e.jpg
http://i295.photobucket.com/albums/mm153/Chickenthief/Skydning/Til%20andre/Winnie2_zps81954631.jpg

But it shoots quite good at the slow speed, go figure!

[felix]

1.2 stability factor is standard for boolits in MY experience. Why? Distance to target is seldom more than 120 yards. ... felix

[detox]

I have read that fast twist rates will strip cast lead bullet of rifling. Maybe a harder Linotype gas checked boolit will help prevent slipage