What twist?

[ButterBean]

Your example is incorrect.
For a given twist rate when you increase velocity you increase stability.
Example, shooting a xx grain bullet through a 16 inch barrel is less stable than the same bullet being shot through a 20 inch barrel because of increased velocity.

Thank's, I was just gonna let that one lay there

 

[MagnumManiac]

First of I'm against over rpm'ing bullets. The faster the twist rate the more resistance to the bullet traveling down the barrel. So you get higher pressure and decreased velocity.

The other fact is that higher velocity decreases the need for low number twist rates. Example a 16 inch barrel .223 can shoot a 55 grain bullet fine. Take the same bullets and put them in a 20 inch barrel and they fly through the paper sideways at 100 yards because of the velocity increase.

Shilen sells a 27 inch 9:1 257 barrel or at least they used to. That works very well for my buddies 06 and 115 Bergers. The 121 is longer, but might work fine going faster.

This statement is completely false.
A faster twist does not increase pressure and or slow a bullet down.

The rest of what you believe has been debunked by others here and is redundant if I repeat it here.

Cheers.

 

[Predator 22]

Thank's, I was just gonna let that one lay there
View attachment 289026

Bad information presented as "fact" hurts the shooting community and at times can be very dangerous. Best to correct it and move on.

 

[ButterBean]

Bad information presented as "fact" hurts the shooting community and at times can be very dangerous. Best to correct it and move on.

Folks accuse me of "Attacking" them here lately when I point out the obvious

 

[MagnumManiac]

A 1:7" twist is definitely fast for a 25-06, it is doable and will only be bad if using bullets of light/thin jackets like ELD-M's.

Cheers.

 

[nealm66]

I've had eld-m's come apart in standard twist barrels when fps is a little higher than a good target speed. I wonder if a faster twist might gain a little speed with the absolute hammers. Hmm..

 

[Hard rock]

A 1:7" twist is definitely fast for a 25-06, it is doable and will only be bad if using bullets of light/thin jackets like ELD-M's.

Cheers.

I just barreled a 25-284 with a 8 twist so I can shoot the 117 gr absolutes, which requires min of 1.8-5 and the 90 gr absolutes hammers min of 1-10 . The 1-8 might still allow me too shoot a well constructed partition , or cup and core so far so good .

 

[ButterBean]

I've had eld-m's come apart in standard twist barrels when fps is a little higher than a good target speed. I wonder if a faster twist might gain a little speed with the absolute hammers. Hmm..

It won't gain any but the TSF numbers go up dramatically

 

[Mike Matteson]

I understand that.

 

[Andrew Massi]

Wasn't talking about varmint bullets. I was referring to other hunting bullets in the 115-120 gr range.

Then no you'll be fine

 

[Orange Dust]

It won't gain any but the TSF numbers go up dramatically

AND, another benefit. Rotational velocity does not decay at anywhere near the rate forward velocity does. Not only will the bullet be more stable during upset, faster twist will help with expansion as velocity decays..... to a point.

 

[GLTaylor]

Actually, as a result of extensive testing and on-animal performance, we are learning that much higher stability factor enhances terminal performance. The new target for sg may be 3+

 

[Orange Dust]

Actually, as a result of extensive testing and on-animal performance, we are learning that much higher stability factor enhances terminal performance. The new target for sg may be 3+

Folks used to think they would lose velocity, and they might lose a few fps. The extra energy is not lost. It is converted to rotational energy and a much more efficient use of the energy, and it is noticeable on wound channels in game.

 

[Muddyboots]

The one thing I have learned with Hammer's is "park" what you think you know and listen up. I learn something new every time I shoot them. One absolute for me is harder I drove them, the more accurate they were for me. I am using 1:8 for my ".270TH" but like to get a 1:7 next!