What is the heaviest bullet a 14 twist 6br will stabilize?

[z4lunch]

Steve here. I wanted to know what the heaviest bullet you guys have had luck stabilizing in a 14 twist 6br
Thank you

 

[fdshuster]

Steve: Two of my 6BR chamberings are 1-14's: a Hart and a Shilen. Both operate at their peak with 70 gr (Sierra #1505), at 75 gr., 5 shot groups at 200 yd will start to open up slightly, but is measurably larger. Others will say their 1-14's will take 80 gr (like the Bergers, for example), and I can agree with that. All 1-14's (or any other twist rate), are not created equal, and as explained in an excellent article in the November "Precision Shooting", page 81, they can vary. Advertised as a 1-14, could really be 1-14.5 or 1-13.5, or ???. It may be best to load only a few of each, near, at, and slightly above the general agreed upon weight/length limits, and take them out and compare side-by-side. This is no different than experimenting with various powders, charges, seating depths, etc. to find what your individual rifle "likes". Basically, what I'm saying is there is no "one-size-fits-all".

 

[RDavies]

It also depends on air density. If it is a hot day or high altitude, you can use a slightly longer bullet, but if it is cold and close to sea level ,the bullet which worked wellin summer might not work in the cold.
If you go to the JBM site (jbmballistics.com),and go to the stability section, it gives a good stability calculator depending on temperature, barometric pressure, velocity, bullet length etc.

 

[fdshuster]

cr500: Good point! Velocity is another factor to be considered. I had a recent load/bullet/twist combination that would not stabilize, boosted the powder charge 1 full grain (still below max), and the group immediately tightened up. Bottom line: you gotta experiment ( and keep good records) to find what works for you, and your rifle.

 

[z4lunch]

Steve here... Ok I know I must have just fell off the turnup truck, but I went on the JBM stability calc. put in all the bullet info and........
I have no clue what that number means...

It also depends on air density. If it is a hot day or high altitude, you can use a slightly longer bullet, but if it is cold and close to sea level ,the bullet which worked wellin summer might not work in the cold.
If you go to the JBM site (jbmballistics.com),and go to the stability section, it gives a good stability calculator depending on temperature, barometric pressure, velocity, bullet length etc.

 

[MarkS]

z4lunch,

I have had 6BR 14tw shoot 80Gr Berger's bullets out to 500yds great, but some 14's want shoot them. the 65 to 75 gr would be the best range.

Mark Schronce