1:7 vs 1:9 twist questionThis is a discussion on 1:7 vs 1:9 twist question within the AR Talk forums, part of the Long Gun Talk category; I was going to go with a 1:9 barrel, but can't get it right now. Can get the 1:7 though. Question is, how is the ...
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04-17-2012, 07:01 AM
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#1
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1:7 vs 1:9 twist question
I was going to go with a 1:9 barrel, but can't get it right now. Can get the 1:7 though. Question is, how is the 1:7 with 55 gr bullets. I'll be shooting mostly 55gr and 62gr bullets. Also, any truth to the 1:7 twist having issues with throat erosion?
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04-17-2012, 07:03 AM
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#2
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If you are only shooting 55 and 62 just go with the 1;9.
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04-17-2012, 07:09 AM
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#3
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1/7 shoots 55 gr bullets just fine. Added advantage of shooting heavier/longer bullets better than 1/9. I own 1/7; 1/8; 1/9. They all shoot 55gr bullets great.
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04-17-2012, 08:06 AM
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#4
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I shoot a 1:7 16" (BCM). Shoots 55 gr absolutely fine. Although I have not shot lighter loads than that, I have heard of 1:7s having some accuracy problems with sub-55g varmint loads. That said, 1:9s are probably fine for most shooters, but 1:9s can be hit or miss above 70 gr - some shoot ok, some are bad. I wanted to fire 75 and 77 gr, so 1:7 was the way to go for me.
Tommato
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04-17-2012, 08:23 AM
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#5
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Actually, 1:9 is fine with heavier rounds at sub 200 yd. distances. It is preferred for varmint loads at all distances. 1:8 would be a better "compromise" choice , IMO.
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04-17-2012, 10:26 AM
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#6
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Shooting 55 and 62 grain rounds I have had no issues with them out of my 1/7 barrel shooting out to 300 yards (max distance at my range).
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04-17-2012, 06:32 PM
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#7
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I have a 1:9 and a 1:7 both shoot 55 up to mid 70's fine.
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04-17-2012, 09:05 PM
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#8
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Quote:
Originally Posted by lowbar
I have a 1:9 and a 1:7 both shoot 55 up to mid 70's fine.
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Regardless of what anyone tells you OP, ^this^ will be the case with almost all rifles of either twist (include 1:8 as well). You can even extend the lower range to 45 gr for most rifles.
Personally I have a 1:9 FWIW.
When I buy the next one, I'm getting 1:8
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04-18-2012, 07:46 AM
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#9
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Well, I think I'm going to get the 1:7(since it's all DD has in stock). Now I have a to decide if I want the mid-length 16" or get a 14.5" and attach the YHM Phantom permantly. I think I would like the look of the 14.5" but not sure about not being able to take the FSP off if needed.
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04-18-2012, 09:24 AM
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#10
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It really comes down to the specific bullet which would need to be tested on your platform, but generally speaking a 1:9 is fine for roughly 45gr to around 62gr (again, depends on specific bullet) while a 1:7 is good from roughly 55gr to around 75gr or thereabouts.
IMHO, of greater importance is how each stabilizes a specific bullet based on barrel length and velocity. Using the Mk318 Mod0 as a reference, if you scroll down the following page a little, you'll see graphs on the stabilization based on barrel spin/twist rate. It's just an example.
MK318 Mod 0 - accuracy evaluation and chronograph data - M4Carbine.net Forums
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1:7 vs 1:9 twist question
