Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Posted: 12/23/2005 7:35:13 PM EDT
In general (I realize there are a multitude of factors), should a 16" 1/8 twist barrel group 55 grain bullets reliably at 100 yards? I was at the range today with my 1/8 16" SS Wilson and I couldn't manage to get decent groups at 100 yards. I've never had a problem grouping at 100 yards with 55 grain bullets in my 1/9 twist 16" Wilson barrel.

I was shooting Wolf 55 and Q3131A. The temperature was 70f with 60% humidity. I’m at about 1000 feet above sea level and completely sober.

The 1/8 barrel was recently threaded, flashed and re-crowned. I'm wondering if the re-crowning may be the problem.

Thanks.
Link Posted: 12/23/2005 7:44:54 PM EDT
There should be nothing wrong with the twist rate as 1:8 should do fine.
You might want to try a different ammo, like some good .223. The Q3131A might be too hot for a stainless barrel with a tight chamber (Don't know if yours is a 5.56 or .223 Chamber).

I would pick up a box of 55 gr. winchester white box at Walmart, or another standard .223 load and see how it does.
Also, have you tried heavier loads in your rifle? It might just be that it likes heavier bullets. If it is a problem across the board, then I would suspect the crowning job.
Link Posted: 12/23/2005 7:45:09 PM EDT
[Last Edit: 12/23/2005 7:45:53 PM EDT by chromeluv]

Originally Posted By sled_999:
In general (I realize there are a multitude of factors), should a 16" 1/8 twist barrel group 55 grain bullets reliably at 100 yards? I was at the range today with my 1/8 16" SS Wilson and I couldn't manage to get decent groups at 100 yards. I've never had a problem grouping at 100 yards with 55 grain bullets in my 1/9 twist 16" Wilson barrel.

I was shooting Wolf 55 and Q3131A. The temperature was 70f with 60% humidity. I’m at about 1000 feet above sea level and completely sober.

The 1/8 barrel was recently threaded, flashed and re-crowned. I'm wondering if the re-crowning may be the problem.

Thanks.



from my minimal experience, you *shouldn't* have any problems from a 1/8 twist barrel with anything between 55-80grainers. The 1/8 twist is commonly referred to as the 'do it all except tracers'

If i am wrong..someone spot check it..
Link Posted: 12/23/2005 9:25:49 PM EDT
I shoot M193 out of a 1/8 and it groups great.
Link Posted: 12/24/2005 1:25:39 AM EDT
[Last Edit: 12/24/2005 1:26:11 AM EDT by NoAim]
In my 1/9 twist Oly button rifle stainless HBAR, M193 doesn't group well, even with a 5.56mm chamber. Different rifling, hotter load. I only get about 2.5 to 3.5 MOA.

I went to Sportsman's and picked up one box of every different .223 ammo they had. Most of it Black Hills. I settled on the 52gr Match BTHP loads in Black Hills. Although it also likes the 45gr Winchester Varmint.

I'll get 1-1.5MOA at that point. Mostly due to me.

Different barrels have different "likes". Try some different brands/weights of locally available stuff to see what shoots best. A lower-power Black Hills, mediam weight bullet would probably work best. Probably 60-68 grain would work.
Link Posted: 12/24/2005 9:33:11 PM EDT
In my 1/8 RRA stainless I have found that the most accurate load at close range (100 yards and less) is the 45 grain varmint loads. I've tried the Hornady match 75 grain loads and they didn't shoot any better than the 55 grain loads. I'd like to load up some 52 grain match and see how they shoot. I have the bullets and a can of Varget but haven't had the time to load up a batch.
Link Posted: 12/27/2005 6:17:37 AM EDT
I like this topic. Q. for you guys...

If you could only have ONE upper, and were going to shoot predominantly 55 grain, what would it be? I'd guess chrome lined, but what length and twist? Thanks!
Link Posted: 12/27/2005 10:12:38 AM EDT
[Last Edit: 12/27/2005 10:14:19 AM EDT by DevL]

Originally Posted By Gorilla:
I like this topic. Q. for you guys...

If you could only have ONE upper, and were going to shoot predominantly 55 grain, what would it be? I'd guess chrome lined, but what length and twist? Thanks!



ABS match 1/7 polygonal PacNor carbon fiber wrapped 11.5" barrel of course. I would not do chrome lined but rather electroless nickle/silicon carbide lining to stick to the stainless match barrel, chamber as well as the barrel extension. They dont make a 1/8 polygonal. I dont think I will own another chromelined barrel unless price is the determining factor.

As for your results with 55 grain in a 1/8 barrel. Its not so much the twist rate that is the issue. Perhaps your barrel does not like 55 grain ammo but likes 52 grain ammo or 60 grain ammo. All barrels are different and like different combinations of bullets and powder etc. Its not as simple as to say certain twist rates shoot certain weights better.
Top Top