Korean G-3 barrel at 50yds. and a question!

[drine]

Just checking out some issues with the rebarrel. OK now. Amazed at the accuracy. I would fire one round, check the bolt seating, fire another. I noticed I was doing OK so I sand bagged my position and let loose 5 controlled shots. The little group in the center is the result. No time to stretch out to 100yds. Public range with no Range officer!
The Korean barrel has more grooves. Does this mean it can stabilize a heavier bullet? I know the CETME is designed for NATO spec rounds but given the same pressures, etc. I just wondered about some of the heavier NATO bullets.
I ask this because of the "LONG RANGE"/SNIPER ammo CTD advertises. 173gr HPBT. That would make a nice round for hunting deer here. It's a bit pricey but it won't be plinkin ammo. Just wondered if this would be OK/SAFE!

[grifter95]

My normal CETME barrel stabilizes 165gr bullets nicely. However, those 173gr "Sniper" rounds are crazy expensive and would do poorly for deer. The hollow-point on them is not designed to make the bullets expand, it is more to make the projectile fly better.

[Player]

i heard the korean barrels had problems with theflutes

[WildBillCody]

It's not the number of grooves and lands, it's the rate at which they turn. Heavier bullets require faster twist rates, .30 cal bullets around 168 are usually 1-12, 1-10 for 180 gr, and 1-11 for in between, you can "overspin" a bullet, not usually a problem with .30 cal, but shoot a 50 gr .223 bullet in a 1-7 and it might not make it to the target, I've seen some dissapear.

[drine]

i heard the korean barrels had problems with theflutes

I asked around before I bought it. Got no replies. After I bought it the info came pouring in. I guess it was in the timing.
Anyhow. It was at the machine shop when I heard about issues. I surfed the net myself and didn't find anything recent (mostly 4 or 5 years old). Since it was bought and paid for and already drilled, I owned it! I figured what the hell, I'll try it. I've had some issues but with the work I did squeezing the receiver a bit . I did go ahead and hone the chamber a bit with scotchbrite. I like it even better now the rifles groups instead of patterns. Maybe the issues were old ones??

[jfowl31]

I haven't checked the twist on my American barrel, but it stablilzes 168 gr bullets well, and the accuracy dropped a bit with 175 gr... though they were still stabilized, they just didn't group quite as well as the 168's.

Instead of buying a box of the buck a round sniper ammo (which btw is designed for the M24 and M40 sniper rifles with a 5R barrel) why don't you just get a bullet puller and seat your own bullets into SA surplus. Thats what I did with GREAT results. Now Ive got some varmint rounds... 110 gr V-max, some deer rounds... 150 gr BST, and some hog rounds... 168 gr BST.

As they said, its the twist rate, not the number of lands that stabilizes or spins a bullet outta control. Your best bet is to try some heavy grain bullets before you spend $30 a box for the sniper ammo that may or may not be accurate at all.

[drine]

I was aware of the twist rate effects on ammo. Really just wanting to know if the round was suitable/safe to fire. I've read some things about extra grooves and lands adding more resistance but it got too:sleepy: for me. The first reply from GRIFTER turned me off to them immediately. The HP aspect of the round was the thing that caught my attention. The HP isn't really a hollow point for game. That's what I was looking for. :thumbup:

[jfowl31]

I've hunted with match hollow points before... they really don't act much different than FMJ as far as stopping power... they pretty much blow straight through.

Now power wise with those loads, they may or may not work great in your Cetme, though Ive heard plenty of guys say they shoot great with a little more felt recoil.

That's why I suggested the heavier bullet in SA surplus... not changing up too much, and its a really easy procedure. It will change the timing a tad, but I imagine since youve got a fresh rifle there, that it wont hurt function. Mine functioned perfectly with 20 rounds of each loading I did.