What twist rate?

[Sniper338]

What twist rate do I need to set up a barrel specifically for hornady 6mm 65 or 75 vmax bullets?

I know I do a 7 and 7.5 for 6mm berger 105 vlds.

Im not certain where 6mm goes when targeting lighter weight 65-75 gr 6mm pills tho.

 

[358WCF]

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.

bergerbullets.com

 

[Ranger188]

The Hornady 65 grain bullet is .898 long and a G1 B.C. of .280
75 vmax is .942 long and G1 is .330
Plug those numbers in the Twist Calculator and you will know
what twist will stabilize those 2 bullets.

 

[Ackman]

I'd make it a 10 twist

 

[B23]

I had a 6-284 built years ago to pretty much shoot the 75 Vmax exclusively and my smith hung a 12tw Lilja on it. The thing is a death ray on coyotes but be aware those 75 Vmax are not fur friendly.

 

[Sniper338]

I had a 6-284 built years ago to pretty much shoot the 75 Vmax exclusively and my smith hung a 12tw Lilja on it. The thing is a death ray on coyotes but be aware those 75 Vmax are not fur friendly.

I dont give 2 chits about fur. I want it to blow up like dynamite.

 

[Sniper338]

The Hornady 65 grain bullet is .898 long and a G1 B.C. of .280
75 vmax is .942 long and G1 is .330
Plug those numbers in the Twist Calculator and you will know
what twist will stabilize those 2 bullets.

Where do I find a stability calculator you speak of?

 

[Ranger188]

In post #2
Or here, just plug in the numbers that work for your shooting.
Handy guide. You can change the temp. altitude, barrel twist to see
what changes your bullet will stabilize in.

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.

bergerbullets.com

 

[okie]

10

 

[Sniper338]

In post #2
Or here, just plug in the numbers that work for your shooting.
Handy guide. You can change the temp. altitude, barrel twist to see
what changes your bullet will stabilize in.

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.

bergerbullets.com

Oh heck I thought that was just all burgers data. I didn't realize you can change it.

So whats the different SG number when you change the twist? There's lots of different twist that says its stable.... but the number gets bigger or smaller depending on the twist

I donno what SG means

 

[Dan V.]

I have 10 and a 13 twist in 6xc and they both shoot the 75 grain v-max well. I would go with a 10 twist because I like the 87 grain v-max for coyotes.

 

[Tangent]

Oh heck I thought that was just all burgers data. I didn't realize you can change it.

So whats the different SG number when you change the twist? There's lots of different twist that says its stable.... but the number gets bigger or smaller depending on the twist

I donno what SG means

It tells you if it's stable or not after you plug in the figures. Roughly, 1.5 and above is good to go.

 

[B23]

I dont give 2 chits about fur. I want it to blow up like dynamite.

I am right there with you on that. In fact if a bullet leaves a gaping hole I can stick my head in and look around all the better.

If you're positive you'll never shoot anything heavier then a 75gr Vmax I don't see any need to use anything faster then a 12tw BUT if you think there is even a remote ever so slight possibility you'd want to shoot something heavier or if say Hornady came out with some crazy new 70-ish grain ELD-VT that required a much faster then normal twist to shoot like their 80gr ELD-VT does then you'd want to consider using something faster.

I put a 20in 9tw Proof Research barrel on my 6 Creedmoor. Been using 70gr Nosler BT's in it and that combo shoots crazy good.

As the gunsmith that built my 6-284 once told me there's no wrong answer just some answers are better then others and barrels are threaded on not welded on for a reason.

 

[Ranger188]

@Sniper338 This calculator is a cool little tool to use for any caliber or
bullet. Just need to know the different number to put in.
Generally, anything over 1.5 your bullet is stabilized and will achieve
the listed B.C. from the manufacturer.
Anything lower than 1.5 and you are not getting the full BC listed.
If you put in numbers and get a lower than 1.5 it will show you the BC
than combination is getting, just look to the right of the SG= number
it will show what it's getting and recommended twist.

 

[CJ6]

I've tried 75 vmax in a 13 twist PPC. They shot ok but not nearly as good as custom bullets (65 and 68 gr Barts).

 

[Infrequent Shooter]

The goal is to have the slowest twist (higher number) that will effectively stabilize your bullet. There are some guys on here who have a barrel that shoots the heck out of the exact bullets you are talking about!! See what they say.