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11/22/2017 10:05:29 PM
Posted: 9/17/2004 7:16:34 PM EST
Has anyone had any firsthand problems with this combination? Or is anyone using this combination without any trouble?
Link Posted: 9/17/2004 7:22:11 PM EST
You cannot overtwist good bullets.
Link Posted: 9/17/2004 7:31:02 PM EST
I've done it. Accuracy seemed to suffer, at least in my case. Not by a significant amount, but I wouldn't try to win any prizes if I were you.
Link Posted: 9/17/2004 7:32:58 PM EST
its fine
Link Posted: 9/17/2004 7:34:45 PM EST
I guess I should clarify. The 55 grain in question are XM193.
Link Posted: 9/17/2004 7:38:25 PM EST
Not even a little bit of a problem.
Link Posted: 9/17/2004 7:39:29 PM EST
XM193 holds about 2 MOA out to 300 yards in just about everything I try it in.
Link Posted: 9/17/2004 7:39:54 PM EST
Many report problems.

Most of my ARs are 1/9, which usually shoot the M193 type ammo well.

I have a Daewoo K2, which has a 1/7 twist, that shoots M193 very well at warm ambient temperatures. It might work all right when cold too, but I just haven't shot it then.

That's my experience.

P.S. The Daewoo DR200 came with a 1/12 twist, and it's a great gun if you can find any.



Link Posted: 9/17/2004 7:43:28 PM EST

Originally Posted By innocent_bystander:
You cannot overtwist good bullets.



Yes you can. Try 45 and some 50 grain varmint bullets in 1:7 twist and they will explode upon leaving the barrel
Link Posted: 9/17/2004 7:47:42 PM EST
Then they weren't good bullets if they came apart from having too thin of a jacket.

The most accurate load I've found out of my Shilen 1x9 is with 52 grain bullets.
Link Posted: 9/17/2004 7:51:06 PM EST
Link Posted: 9/17/2004 7:51:07 PM EST
no problems whatsoever. Only varmint bullets are a problem.
Link Posted: 9/17/2004 8:21:28 PM EST
I went to the range today and shot this very combination. The upper is a 1:7 LMT 14.5 inch on a Stag lower and LMT enhanced bolt group. This was the first time the rifle was shot since build. I fired 400 rounds through it and I didnt have a single malfunction. I only shot at 25 yards to zero my Aimpoint and BUIS and to make sure no problems arose. I was using brand new Labell(SP?) magazines. All shot groups were around 1 inch diameter. I dont remember what the lot number on the ammo was. Hope this helps out!
Link Posted: 9/18/2004 4:26:17 AM EST

Originally Posted By innocent_bystander:
You cannot overtwist good bullets.



Overstabilize?
Link Posted: 9/18/2004 4:37:25 AM EST
No problems here.
Link Posted: 9/18/2004 4:45:59 AM EST

Originally Posted By 9KArmorer:
I went to the range today and shot this very combination. The upper is a 1:7 LMT 14.5 inch on a Stag lower and LMT enhanced bolt group. This was the first time the rifle was shot since build. I fired 400 rounds through it and I didnt have a single malfunction. I only shot at 25 yards to zero my Aimpoint and BUIS and to make sure no problems arose. I was using brand new Labell(SP?) magazines. All shot groups were around 1 inch diameter. I dont remember what the lot number on the ammo was. Hope this helps out!


Very much so. Thank god somebody knows how to qualify their opinion.
Link Posted: 9/18/2004 5:58:04 AM EST
[Last Edit: 9/18/2004 6:06:55 AM EST by Yojimbo]
I've had excellent results with XM193 and my 1/7 CMMG upper.

If I do my part the XM193 can shoot MOA. Remember XM193 is 2MOA spec ammo and this is not normally to be expected.

Here's a pic off my best 100 yard group sand bagged off the bench using an EOTech 552. Ammo was XM193 Lot 52, I did this just to see how accurate XM193 could be out of a 1/7. I still had one flyer but you can see that 55gr will work very well out off a 1/7 barrel.



Here's an average 100 yard 10 round group from the prone. When doing faster combat type shooting I'm more than happy to be able to keep all the rounds in a 8" circle.


Link Posted: 9/18/2004 6:05:40 AM EST
[Last Edit: 9/18/2004 6:06:11 AM EST by Yojimbo]

Originally Posted By jonathan1994:

Originally Posted By innocent_bystander:
You cannot overtwist good bullets.



Yes you can. Try 45 and some 50 grain varmint bullets in 1:7 twist and they will explode upon leaving the barrel



This more due to the bullet construction and using very thin jacketing. Brouhaha has mentioned using 40 gr bullets out of his 1/7 and getting decent accurcy too. You just need to be more selective when using the lighter bullets.
Link Posted: 9/18/2004 6:42:23 AM EST

Originally Posted By innocent_bystander:
You cannot overtwist good bullets.



Huh? I assume you mean *good bullets* are those with a strong enough case to not come aparts from being over spun and this has nothing to do with overstabilization or accuracy?

I know that many say you can not overstabilize a bullet and a good rule is to select the twist rate that will stabilize the longest bullet the rifle will shoot and address the transonic range and needs of the application to make it to or through that point... but you have to admit that spinning a bullet faster that it needs to spin does affect the accuracy of that bullet.
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