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Posted: 9/14/2010 9:07:16 AM EDT
I have read more than i care about twist rates and bullet lengths/weight. All I want to know is whether a 1:7 twist will shoot a 55 grain and maybe a 50 grain bullet and stabilize it every time. Thanks guys.
Link Posted: 9/14/2010 9:09:03 AM EDT
[Last Edit: 9/14/2010 9:09:27 AM EDT by Market_Garden]
7 twist shoots 55s just fine, and most people report that 50s are perfectly fine too. This thread is made at least 5 times a week, and the answer never changes.
Link Posted: 9/14/2010 9:27:05 AM EDT
Originally Posted By Market_Garden:
7 twist shoots 55s just fine, and most people report that 50s are perfectly fine too. This thread is made at least 5 times a week, and the answer never changes.


+1
Link Posted: 9/14/2010 9:28:46 AM EDT
I have heard that 1/7 may have problems with the very light, thin jacketed varmint bullets.

My 1/7 twist carbine does great with m193.
Link Posted: 9/14/2010 9:29:48 AM EDT
Originally Posted By Market_Garden:
7 twist shoots 55s just fine, and most people report that 50s are perfectly fine too. This thread is made at least 5 times a week, and the answer never changes.


FYI - I just did a search for the past 30 days and read each thread about 1:7 twists and did NOT find where someone said a 1:7 twist will shoot a 55 grain bullet reliably.
Link Posted: 9/14/2010 9:42:10 AM EDT
Really? This thread again?
Link Posted: 9/14/2010 9:47:35 AM EDT
Shot my 1/7 LMT Sunday, 200 rounds so far of 55gr Federal Eagle, some NICE groups. A friend had some 40gr reloads, and the damn things shot into one hole nearly at 50 yards.
Link Posted: 9/14/2010 9:51:01 AM EDT
Originally Posted By rockriver1234:
I have read more than i care about twist rates and bullet lengths/weight. All I want to know is whether a 1:7 twist will shoot a 55 grain and maybe a 50 grain bullet and stabilize it every time. Thanks guys.


Yes
Link Posted: 9/14/2010 9:52:52 AM EDT
My WOA 1/7 does fine with them
Link Posted: 9/14/2010 10:15:14 AM EDT
Originally Posted By PR361:
My WOA 1/7 does fine with them


Mine shoots 50 and 55 just fine actually the 50grn hp federal is one of the most accurate factory loads I've used
Link Posted: 9/14/2010 10:17:38 AM EDT
Mine stabilizes 40 grains just fine
Link Posted: 9/14/2010 10:26:56 AM EDT
Originally Posted By rockriver1234:
Originally Posted By Market_Garden:
7 twist shoots 55s just fine, and most people report that 50s are perfectly fine too. This thread is made at least 5 times a week, and the answer never changes.


FYI - I just did a search for the past 30 days and read each thread about 1:7 twists and did NOT find where someone said a 1:7 twist will shoot a 55 grain bullet reliably.


I think you may have that backwards.
Link Posted: 9/14/2010 10:32:01 AM EDT
I have a 1/7 20" govt profile. It will shoot my hot 55gr bullets great. The timid loads are a little less accurate.
Federal XM 193 will shoot into 2-3" at 100 yards.

I've never shot any bullets lighter than 55gr in that particular AR.
Link Posted: 9/14/2010 10:33:51 AM EDT
I Shoot 45gr HP in 1/7

No problems at all

50 - 55gr HP even better!
Link Posted: 9/14/2010 10:42:46 AM EDT
Originally Posted By chase45:
Mine stabilizes 40 grains just fine


I belive ya
I had a box of Ultramax 40gr Nosler
No problems
Rack grade M4 14.5 LMT


Molon needs to do a winchester USA 45gr HP test useing 1/7 M4
Then maybe just maybe they will belive him.



BTW
LMT uses XM193 to zero and test all there 5.56 uppers a 55gr bullet







Link Posted: 9/14/2010 10:47:07 AM EDT


BTW
LMT uses XM193 to zero and test all there 5.56 uppers a 55gr bullet



That's good to know
Link Posted: 9/14/2010 11:12:03 AM EDT
I just got back from the range shooting 55 grain Hornady Sp from my 14.7 inch 1/7 twist. gun was shooting right at an inch untill I got it real hot then groups opened up to about 1.5 inches. So to answer your question it looks OK at 100 yards. I never really shoot that gun past 100 so I can't comment on that.
Link Posted: 9/14/2010 11:12:17 AM EDT
It depends on the individual barrel. 99.9% of the time, however, a 1/7 will stabilize a 55gr round just fine.
Link Posted: 9/14/2010 11:14:44 AM EDT
A 1-12 twist barrel will stabilize a 55-gn bullet under most conditions, and a 1-7 twist will do so with a vengeance.
Link Posted: 9/14/2010 11:32:28 AM EDT
Originally Posted By rockriver1234:


BTW
LMT uses XM193 to zero and test all there 5.56 uppers a 55gr bullet



That's good to know



Yeap

Just Ask The Man Gene Swanson RD man of LMT

Or beter yet go and see yourself

Link Posted: 9/14/2010 11:36:29 AM EDT
Originally Posted By HBruns:
A 1-12 twist barrel will stabilize a 55-gn bullet under most conditions, and a 1-7 twist will do so with a vengeance.



The only Time I ever had a problem is when I bought the Canadian C77 a SS109 bullet back in the mid to late 80`s
I went to shoot it in my old mini 14 wich had a 1/14 twist
anyway I kept the Bandolier

BTW 1/14 twist will shoot 55gr just fine

Link Posted: 9/14/2010 12:35:21 PM EDT
Bullet weight is not the true variable, it is bullet length. (length and weight are usually closely related, but different style bullets can make different length bullets of the same weight)

..just thought I would mention that.
Link Posted: 9/14/2010 12:40:19 PM EDT
Originally Posted By woode:
Bullet weight is not the true variable, it is bullet length. (length and weight are usually closely related, but different style bullets can make different length bullets of the same weight)

..just thought I would mention that.


True

Link Posted: 9/15/2010 7:31:19 AM EDT
Originally Posted By FMJ:
Originally Posted By chase45:
Mine stabilizes 40 grains just fine


I belive ya
I had a box of Ultramax 40gr Nosler
No problems
Rack grade M4 14.5 LMT


Molon needs to do a winchester USA 45gr HP test useing 1/7 M4
Then maybe just maybe they will belive him.

Yea I keep 40gr in this little guy. It shoots them around 2650. Barrel is 1/8.

Tried them in my 1/7 12.5 and it hit the gong at 400 everytime so they seem to work fine

BTW
LMT uses XM193 to zero and test all there 5.56 uppers a 55gr bullet









Link Posted: 9/15/2010 7:51:41 AM EDT
I think 1/7 works great on carbine lenght baarrels and lightweight bullets, but then the question mark goes for the longer 20" batrrels. I have had a few 55 grain bullets keyhole on me while breaking my BCM A4 upper, however, my carbine barrel, which is a 1/9, works perfect with both 55 grain and 62 grain bullets.

I'll stick with 62 grains on my A4 clone, I can get some IMI 62 grain ammo fairly easy.
Link Posted: 9/15/2010 7:55:52 AM EDT
Can we not add this to the FAQ section somewhere, Zhukov?
Link Posted: 9/15/2010 8:07:18 AM EDT
Wow, wednesday comes back around so fast.
Link Posted: 9/15/2010 8:32:59 AM EDT
[Last Edit: 9/15/2010 8:32:59 AM EDT by Zhukov]
Yes, it'll be fine. Yes, this thread is a dupe. Yes, you should read the FAQ at the top of the page.
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