Berger Hybrid changes

[normmatzen]

I think I missed something important. Some time in the not too distant past, the box of 105 6mm Hybrids changed from recommended 1-8 twist to 1-7?

About the same time hybrids stopped shooting well in my gun.

Has Berger changed the stability of the hybrids which means some geometry changes?

 

[dmoran]

When they stopped shooting well in your gun, was it with a new Lot?

If so, and if there was any "base to ogive" variation, a change in seating depth maybe needed as well.
Same thing can happen from barrel/throat erosion, that at times also needs the seating adjusted to keep up with the erosion factor.

Variation in bullet diameter from one Lot to the another can also have an effect on accuracy. Neck tension being a tuning aspect to help adjust for diameter variations.

Good Luck
Donovan

 

[Zero333]

The bullets have not changed, besides the usual lot to lot variances.

Reason for Berger recommending a 7 twist is because not too long ago a 1.4+ stability factor was considered enough to fully stabilize a bullet, but now 1.5+ stability factor is the new standard.

When Berger tests their bullets and their output data suggests one needs a 7.7 twist to fully stabilize the projectile, Berger will recommend a 7 twist for that bullet. They just round down to the whole number.

 

[Dubya]

The bullets have not changed, besides the usual lot to lot variances.

Reason for Berger recommending a 7 twist is because not too long ago a 1.4+ stability factor was considered enough to fully stabilize a bullet, but now 1.5+ stability factor is the new standard.

When Berger tests their bullets and their output data suggests one needs a 7.7 twist to fully stabilize the projectile, Berger will recommend a 7 twist for that bullet. They just round down to the whole number.

I just got a new Krieger 7.5 twist barrel, and you are saying it will not stabilize the Berger 105 Hybrids???
Would like to know for sure before I have it chambered.

Gary C.

 

[22DASHER]

I just got a new Krieger 7.5 twist barrel, and you are saying it will not stabilize the Berger 105 Hybrids???
Would like to know for sure before I have it chambered.

Gary C.

Chamber that thing and don't look back. I just shot a new lot of hybrids in my 8 twist and they shot phenomenal..

 

[dmoran]

I just got a new Krieger 7.5 twist barrel, and you are saying it will not stabilize the Berger 105 Hybrids???
Would like to know for sure before I have it chambered.

Gary C.

World records have been set at 1000-yards with that very same combination (Krieger 7.5 / 105-Hybrids).
Chamber away !.!.!
Donovan

 

[Zero333]

I just got a new Krieger 7.5 twist barrel, and you are saying it will not stabilize the Berger 105 Hybrids???
Would like to know for sure before I have it chambered.

Gary C.

You didn't read my post thoroughly, and why Berger changed their twist recommendation for the 105 Hyb's from 8 to 7 twist.

If you use Bergers twist calculator, It will calculate you'll need a 7.75 twist for the 105 Hybrid's in the worst case scenario (cold temp at sea level).
Berger "recommendation" (listed next to the bullets) for some reason is rounded down to 7 twist instead of recommending 7.7 twist like their calculator suggest.

I shoot out of a 8 twist with 105 Hyb's.

 

[Dubya]

World records have been set at 1000-yards with that very same combination (Krieger 7.5 / 105-Hybrids).
Chamber away !.!.!
Donovan

Thanks guys, that's what I wanted to hear.

 

[RGRobinett]

The bullets have not changed, besides the usual lot to lot variances.

Reason for Berger recommending a 7 twist is because not too long ago a 1.4+ stability factor was considered enough to fully stabilize a bullet, but now 1.5+ stability factor is the new standard.

When Berger tests their bullets and their output data suggests one needs a 7.7 twist to fully stabilize the projectile, Berger will recommend a 7 twist for that bullet. They just round down to the whole number.

Not to argue, but, Sg 1.5 has always - well, as long as I can recall - been the gyroscopic factor to assure stability, while 1.4 has been the minimum recommended factor. Especially for long/heavy for caliber bullets, Sg 1.5 is a good thing, and for high quality bullets, there is no significant downside to a greater factor - there will just be more vertical associated with with windage misreads, as the gyro tries to evade the applied force. But, if you're missing the reads, you probably aren't winning anyway. ;-) RG

 

[barefooter56]

I think I missed something important. Some time in the not too distant past, the box of 105 6mm Hybrids changed from recommended 1-8 twist to 1-7?

About the same time hybrids stopped shooting well in my gun.

Has Berger changed the stability of the hybrids which means some geometry changes?

Norm,
There were no changes made to the bullet. We found that the two twist rates we listed previously were confusing to some shooters and in some cases the twist rates were not enough due to temperature and altitude. What we have gone to is an "OPTIMUM" twist rate based on a worst case scenario of 59 degrees Fahrenheit at sea level . As Zero333 did go to our TWIST RATE CALCULATOR here :
http://www.bergerbullets.com/twist-rate-stability-calculator-updated/ and enter your data along with the ALTITUDE (S) you will be shooting at. See here :
http://www.bergerbullets.com/berger-bullets-twist-rate-recommendations-by-eric-stecker-bryan-litz/ for how to properly interpret your findings .
Take care,

 

[normmatzen]

Thanks Phil

 

[wapiti25]

Phil, You are doing a GOOD service to help us with the info on Berger bullets. Thank you

 

[Mozella]

.......... snip............But, if you're missing the reads, you probably aren't winning anyway. ;-) RG

Oh, I don't know. It's kind of like you and your hunting friend outrunning the bear. You don't have to run faster than the bear. You know the rest of the joke.

You can misread the wind and still win as long as the other guys misread it worse than you do.