Barrel twist question for 300wm.

[RemHutch50]

I'm looking at getting a 300wm. I've noticed that most factory guns only offer the 300 in 1:10.
Was reading the browning site and noticed that they moved their LR to the faster 1:8. Asked a buddy about it and he said a lot of the custom guys were using the 1:8 as well.

So my question is: which is preferable in a factory gun (or maybe a semi-custom build with a rem 700) and upper end factory ammo (or what I find it likes best)? The 1:10 or 1:8?

If it helps, I'm looking at the X Bolt hell's canyon in either the LR or Speed, the Rem 700 5R, the Tikka, or finding a used Rem 700 and adding HS stock with a good trigger and then maybe trueing action etc.

Thanks in advance guys.

 

[RemHutch50]

I guess I should mention that I'd really like the end result being under 9lbs and closer to 8 would be better.
Also this would be used to hunt whitetails here at home occasionally and for that out west mountain hunt for deer, elk, or whatever I may get to hunt. I will also be using it to shoot targets and steel to 1000yds here mostly for fun and practice.

 

[RockyMtnMT]

8 twist opens up bullet options and will help with terminal performance as well as long range accuracy.

 

[MagnumManiac]

The only reason for an 8 twist would be if a 250-260gr bullet you could push fast enough came out.
I don't see any advantage to a twist faster than 9, and 10 will handle ALL bullets available so far.

Cheers.

 

[KyCarl]

I have one with a 10 twist and it shoots 195-215 Gr. stuff really well!
I don't see that I need to change? The first 3 shots with Federal GM with 195 SMK's
was a .400 group and it has gotten a little better.

 

[Slick8]

The first question is what is your desired bullet weight?

As Karl said a 10 will work but an 8 seems really fast unless you're wanting to shoot 230s and above. I'd say a 9 or 10 would do for most

I'm going with a 9 with the intention of shooting 200-215s on a custom.

 

[KyCarl]

I don't shoot mine as much as I would like. It has a Boots O. 5R barrel and
I don't know if he will ever make any more? I'm "saving" it for some odd reason?

 

[dfanonymous]

There is such a thing as over stabilation

 

[FEENIX]

There is such a thing as over stabilation

Interesting analogy (???) from Sierra ...

Think of it like tires on your truck. If you have a new set of tires put on your truck, and they balance them proper at the tire shop, you can drive down a street in town at 35 MPH and they spin perfect. You can get out on the highway and drive 65 MPH and they still spin perfect. A bullet acts the same way.
(SOURCE: https://sierrabulletsblog.com/2015/05/07/understanding-twist-bullet-stabilization/)

... and another discussion ...

http://bulletin.accurateshooter.com...on-of-bullets-why-is-too-much-spin-a-problem/

... and a video from now an LRH member.



I calculated all of my rifles with faster twist and all seems to be under 200K RPM.

 

[Hatrick]

With the 300wm I think I would err on the side of over stable. As Steve said it will help in long range terminal performance. I don't think the 300 can drive the 150s fast enough to pull them apart as the jackets are heavier than the smaller varmint bullets.

 

[RemHutch50]

I would guess that I will be shooting something in the 180gr-215gr range. Preferably in the lower part of that.
As I said, I hope to find a factory load (that's easy to get and hopefully not overly expensive) that will shoot good.

Thanks for your answers guys.

The main reason I asked this question is because most factory guns are in the 1:10 twist and that is only in their "LR" model. I'd like to go with something other than the LR because of the weight.

 

[RockyMtnMT]

When Nemo was developing their long range 300wm they discovered that they had better long range accuracy with an 8 twist than with a 10 twist. They were running 215 Bergers.

Poorly constructed cup and core bullets may suffer from the faster twist. Most of today's bullets are much better constructed than even just 10 years ago. I don't think over stabilization is near the issue that it once was.

10" twist will not handle All the bullets currently avail. The 200g class and bigger lead free bullets will not work well in a 10" twist.

I see no down side to the 8" twist.

 

[entoptics]

My 1:10 will blow up 110 gr V-Max bullets, 99% of the time. It also does just dandy with 200-212 grain bullets. Haven't tried anything heavier, but the stabilization calculators indicate it's just fine up to at least 220 grain bullets.

1:8 just seems fast to me, but on the other hand, aside from party tricks, who's using bullets less than 150 gr in a 300 WM?

 

[dfanonymous]

Interesting analogy (???) from Sierra ...

Think of it like tires on your truck. If you have a new set of tires put on your truck, and they balance them proper at the tire shop, you can drive down a street in town at 35 MPH and they spin perfect. You can get out on the highway and drive 65 MPH and they still spin perfect. A bullet acts the same way.
(SOURCE: https://sierrabulletsblog.com/2015/05/07/understanding-twist-bullet-stabilization/)

... and another discussion ...

http://bulletin.accurateshooter.com...on-of-bullets-why-is-too-much-spin-a-problem/

... and a video from now an LRH member.



I calculated all of my rifles with faster twist and all seems to be under 200K RPM.

I'm glad you have so much resource material. However I'm aware, for years of this information. hence why I like to be the little voice on here not discouraging but also not encouraging higher twist rates.

However magnus effect aside, my issue is mostly nose up belly flat issue. since this is like the 3rd twist rate question and everyone is so quick to tell people to over twist and no one mentions what the cause and effect is to these people asking.