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Twist Rate???

 
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  #1  
Old 04-01-2009, 11:36 AM
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Twist Rate???

Hey guys i'm going to have to let Kreiger know something today about the twist rate for the barrell they are making. I had originaly decided to go with a 1 to 11 because i was going to shoot factory ammo(and i shot the 180g winchester silver tip). Well i have already bought the stuff i will need to start hand loading. It seems that most of you guys are using 200gr bullets in your 300 WM. I'm a little worried that 1 in 11 may not be fast enough if i go wth a 200gr accubond or a 208 A-MAX..on the flip side i could load some 165 grain stuff and that would be nice, but it seems that most here and on snipershide will go weight over a few more FPS...If there is anyone out there with some ideas...this is not one that is an "easy do-over" It is a hunting rifle first but i will be shooting at 1000 yards(targets)


Thanks
Ryan
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  #2  
Old 04-01-2009, 12:08 PM
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Re: Twist Rate???

I doubt you'll be able to tell which twist will shoot factory ammo better especially through a high quality aftermarket barrel.

That said I think your best bet would be to change it to a 10 twist or even a 9.

I'd rather be over twisted than under twisted.

Quote:
It is a hunting rifle first but i will be shooting at 1000 yards(targets)
Targets are where it starts, next thing you know you'll be shooting animals out there. It's best to be prepared.
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  #3  
Old 04-01-2009, 12:10 PM
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Re: Twist Rate???

Not to be a smart ass,,,
What is the problem?
What are you going to let Krieger know?

I don't see why there would be an issue with 1:11 for 30cal bullets,, if thats your concern.
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  #4  
Old 04-01-2009, 01:20 PM
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Re: Twist Rate???

11x will handle 200's 208's 210's and 220's. It will not handle the 240 SMK.

I am not trying to be a smart ***** either but over spinning a bullet WILL have less than desirable effects on LR shooting such as a sub par BC and extra spin drift. 11 is more than enough for up to 220's.

If 180 grains was your max bullet weight then 12x would have been much better.
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Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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  #5  
Old 04-01-2009, 01:28 PM
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Re: Twist Rate???

The problem is...kreiger already takes about 16 weeks to build a barrel and they said that If I didn't want to add to that I needed to tell them if I wanted a different twist than the one I ordered(11). Like I stated I was worried that an 11 twist would not handle the bullets over 200gr. You don't have to be a smart ass
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  #6  
Old 04-01-2009, 01:40 PM
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Re: Twist Rate???

Quote:
over spinning a bullet WILL have less than desirable effects on LR shooting such as a sub par BC and extra spin drift.
Not to be argumentative but I've never noticed any loss of BC or excessive SD with overly spun bullets. Actually I've shot some of my best groups ever (at 1k) with extreme RPM's. My BC's were on par or slightly above Nosler, Sierra and Berger's listings.

Also my brother shoots a 300 AX with an 8 twist. It shoots the 240 SMK's spot on to Sierra's BC calculations with no noticeable spin drift, well no more than one could judge at 1K.

Another one would be the 6mm-06 shooting the 107 SMK's @ 3400+ in a 8 twist, although I know this is not an extreme case scenario. Still no problems with that out to 1000 yards.
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  #7  
Old 04-01-2009, 03:21 PM
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Re: Twist Rate???

Quote:
Originally Posted by MagMan View Post
Not to be argumentative but I've never noticed any loss of BC or excessive SD with overly spun bullets. Actually I've shot some of my best groups ever (at 1k) with extreme RPM's. My BC's were on par or slightly above Nosler, Sierra and Berger's listings.

Also my brother shoots a 300 AX with an 8 twist. It shoots the 240 SMK's spot on to Sierra's BC calculations with no noticeable spin drift, well no more than one could judge at 1K.

Another one would be the 6mm-06 shooting the 107 SMK's @ 3400+ in a 8 twist, although I know this is not an extreme case scenario. Still no problems with that out to 1000 yards.
I believe you.

I would be willing to bet that if you used a 10x in the 300 AX next to your 8x you would see a notable increase in BC provided the bore quality and groove type were the same.
__________________
Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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