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7mm STW Reloading Thread

 
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  #57  
Old 04-29-2013, 08:05 AM
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Re: 7mm STW Reloading Thread

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Originally Posted by 80 grains View Post
Lle

Im waiting on some powder to arrive for this bullet. I was going try Us869. I wanna be sure the twist recommendations weren't a road block.
When they say 8" twist minimum, they want 8" or faster twist... Say 7.5 or 7" twist in this case. Most 1 in 9 barrels will be marginal if they are asking for the 8" twist, especially at lower altitude. Both bullet length AND weight are variables here. My ar shoots some 75-77 grain pills well at 9" twist, but some would be needing an 8" twist, especially the poly tipped ones.
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  #58  
Old 04-29-2013, 08:16 AM
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Re: 7mm STW Reloading Thread

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Originally Posted by Lefty7mmstw View Post
When they say 8" twist minimum, they want 8" or faster twist... Say 7.5 or 7" twist in this case. Most 1 in 9 barrels will be marginal if they are asking for the 8" twist, especially at lower altitude. Both bullet length AND weight are variables here. My ar shoots some 75-77 grain pills well at 9" twist, but some would be needing an 8" twist, especially the poly tipped ones.
The box says 8" twist or faster. I didnt see this when i bought them and now im wondering if its safe to load these at all. My barrel is 9" .
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  #59  
Old 04-29-2013, 08:22 AM
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Re: 7mm STW Reloading Thread

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Originally Posted by 80 grains View Post
The box says 8" twist or faster. I didnt see this when i bought them and now im wondering if its safe to load these at all. My barrel is 9" .

Your 9" twist barrel probably won't stabilize them. What will happen is you will see the bullet holes in the paper targets won't be nice small round holes. They will start leaving "Key hole" slots. That's if you can get them to hit the target at all. Sometimes an unstabilized bullet will fly anywhere, but on target.
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  #60  
Old 04-29-2013, 08:53 AM
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Exclamation Re: 7mm STW Reloading Thread

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Originally Posted by Fire306 View Post
Your 9" twist barrel probably won't stabilize them. What will happen is you will see the bullet holes in the paper targets won't be nice small round holes. They will start leaving "Key hole" slots. That's if you can get them to hit the target at all. Sometimes an unstabilized bullet will fly anywhere, but on target.
It makes me curious as to why they make a bullet for a caliber that typically has a 9 twist and require a faster twist. Im still learning and i may sound silly. But I'll ask first instead of being in the obituaries.
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I pulled the trigger...the percussion caused the earth to halt rotating. And then the bullet hit and made it spin again.
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  #61  
Old 04-29-2013, 10:49 AM
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Re: 7mm STW Reloading Thread

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Originally Posted by 80 grains View Post
I am wondering why it says on the box of Sierra 180 gr hpbt 8" twist or faster?
Its just a suggestion based on their data
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  #62  
Old 04-29-2013, 10:53 AM
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Re: 7mm STW Reloading Thread

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Originally Posted by ButterBean View Post
Its just a suggestion based on their data
I see. Thanks fellas for all the info i've really enjoyed this forum. I'm obliged.
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I pulled the trigger...the percussion caused the earth to halt rotating. And then the bullet hit and made it spin again.
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  #63  
Old 04-29-2013, 11:17 AM
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Re: 7mm STW Reloading Thread

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Originally Posted by 80 grains View Post
I see. Thanks fellas for all the info i've really enjoyed this forum. I'm obliged.
No Problem
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