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270 Sherman

 
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  #43  
Old 02-10-2014, 06:02 PM
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Re: 270 Sherman

Hate revive an old one but it interest me. What kind of velocity would you see with a 28-30" barrel in this chamber?
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  #44  
Old 02-10-2014, 06:35 PM
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Re: 270 Sherman

With max loads and a 30" tube I think these speeds are doable:

165g Matrix 3100fps,
150 Berger 3200fps,
130 Berger 3300fps.

It is probably the most performance you can get from a 270 case. The finished cases run around 10% more powder capacity than the same fired case before fire forming.
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  #45  
Old 02-10-2014, 07:02 PM
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Re: 270 Sherman

Quote:
Originally Posted by CogburnR View Post
With max loads and a 30" tube I think these speeds are doable:

165g Matrix 3100fps,
150 Berger 3200fps,
130 Berger 3300fps.

It is probably the most performance you can get from a 270 case. The finished cases run around 10% more powder capacity than the same fired case before fire forming.
I agree, those numbers are similar to that off my .270 AI! I've exceeded 3100 FPS with 175 Matrix but with too much pressure and accuracy started to open up; I've settled for 2993 FPS with 175 Matrix as my accuracy load at least for now.
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Last edited by FEENIX; 02-10-2014 at 08:26 PM.
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  #46  
Old 02-10-2014, 07:06 PM
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Re: 270 Sherman

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Originally Posted by FEENIX View Post
I agree, those numbers are similar to that off my .270 AI! I've exceeded 3100 FPS with 175 Matrix but with too pressure and accuracy started to open up; I've settled for 2993 FPS with 175 Matrix as my accuracy load at least for now.
Wow that's impressive! This is the reason I wish Hornady would introduce a .277cal A-MAX in a heavy weight such as a 162gr to push them in the .270 AI, .270 Sherman, .270 WSM, and .270 WBY. Would love to have a .270 AI or .270 Sherman one day.
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  #47  
Old 02-10-2014, 07:31 PM
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Re: 270 Sherman

Quote:
Originally Posted by FEENIX View Post
I agree, those numbers are similar to that off my .270 AI! I've exceeded 3100 FPS with 175 Matrix but with too pressure and accuracy started to open up; I've settled for 2993 FPS with 175 Matrix as my accuracy load at least for now.
This is some good info for you Trever. The Sherman should add 50' to an A.I. everything else equal. Bottom line, 3100' with a 165 might be a moderate load.......Rich
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  #48  
Old 02-10-2014, 09:00 PM
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Re: 270 Sherman

I will be going with the Sherman design for sure. If nothing else comes about.
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  #49  
Old 02-10-2014, 09:59 PM
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Re: 270 Sherman

Quote:
Originally Posted by Jud96 View Post
Wow that's impressive! This is the reason I wish Hornady would introduce a .277cal A-MAX in a heavy weight such as a 162gr to push them in the .270 AI, .270 Sherman, .270 WSM, and .270 WBY. Would love to have a .270 AI or .270 Sherman one day.
It's nice to get magnum performance out a non-magnum chambering. I'm currently performing around my friend's factory Weatherby Accumark in 7MM Mag using HSM 180 Berger VLD (2845 FPS) with my 175 Matrix VLD at 2993 FPS.
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