6-284 or 6SLR?

[Frankr]

what would be the best cartridge to push the 115 VLD hunting bullet. in a hunting rifle?
6-284. 6SLR. 6CM. 243 imp 30deg. what would be the best cartridge of those listed? as they seem to be the most accurate one's. pro's and con's of each? as action length,i could use a long action if needed to.

berger states you need a 1-7 twist for the 115 VLD and even if you run the twist calculator a 1-7 twist shows better for a 105 VLD at lower altitudes in cold weather.

also I can not tell the big difference between the 6CM and the 243 imp 30deg. other than the 6CM is a 31 deg shoulder?

In other words i'm having trouble understanding the differences in some of these 6mm cartridges. the only thing I see is it looks like if you were to throat them to keep a 115 above the neck shoulder junction you would need to go to a long action.

thanks for any help.

 

[CJ6]

My 2 cents.....A 6-284 really doesn't come into it's own till you use 28"+ (the longer the better) barrels and that's a little long for most people to use has a hunting rig. A 243 AI 6x47 Lap, 6CM etc. would be a better choice. There's not that much difference in velociity between the aforementioned class of cases and the 6-284 in 26" and shorter barrels and the throats will last a "LITTLE" bit longer. I'll always use/have a 6-284 (at least one) but it's going to be in a LONG barrel.

 

[Frankr]

CJ6 I know several guy's shooting a 6-284 with 105's in a 26" 1-8 twist at over 3,300 FPS. I know for sure that is not possible from 6x47L. i'm not sure about the 243AI or the 6CM(competition match). but my guess would be high 3,100's to 3,200 FPS. But i'm asking about the 115 VLD in a 1-7 twist. and im not sure what kind of velocity could be had. my gut is telling me to go with the biggest case that is accurate/ie 6-284. but I just don't know for sure and it is a lot of money to spend . so I want to try and make a imformed decision. I shoot a 6xc and have no problem rechambering one or two of them in a 1-7 or 1-7.5 but I know in the cold weather 0-25deg F it's going to be hard to get more than 2,950FPS with a 115 in the 6xc.

my target velocity in a 26" hunting rifle with the 115 in a 1-7 twist is around 3,100 fps + at 0-30 deg F
I can use the 6xc for the 105's at 0-30 deg F with RL17 I get 3,100 to 3,150 FPS . H4350 fell on it's face below 40 deg F to about 2,950 with the 105.

then there are those that don't think you need any more than a 105 at 3,100FPS out to 900yrd's. Im just not sure.
so my plan was to set up a custom hunting rifle to shoot the 115 vld.

 

[Dgd6mm]

I've had my 27" 6MM Competition Match shooting 3225fps with a 115 DTAC. Mild load, my 5 shot group at 1000 yards was 6.5" of vertical and under 4" horizontal. I dropped the charge and my 5 and 10 shot groups went to just under 4.5"vertical, horizontal remained the same. Fps at 3153. My 30" I run the 3225fps charge of the 27" in and I have not chronoed but my come ups say it's at least 3275fps. I could have easily went to the next node in the 27", but at the time I was new to the 6CM and chose to to go lower. When I spin the new barrel on that is waiting, I will run to the next node, providing I get the accuracy.

 

[Frankr]

thanks Dgd6mm. the questions I ask you is at what tempeture's have you shot it?
do you know what the difference is in the 243 IMP 30 deg compared to the 6CM?
what twist are you using?
what is the OAL of your round with the 115 DTAC?
as berger states you need a 1-7 twist for the 115 VLD. I wonder how a 7 twist works for other bullets?

 

[Dgd6mm]

When I started shooting it I lived in South Florida 100 degree weather. I live in N.Florida now, I've shot it when the water in the back of my truck was still frozen afternoon time in the sun. I do not really know Robert's cartridge other then I guess when he was shooting the 6CM he liked it so much he had to come out with something like it. My oal in my Tac rifle is 2.890", I use AlphaII mags. I have 2 Krieger 7.5 twist and a Lawton 7.65 twist. I was rereading your questions and thought I'd add just incase you were asking how hot I've ran the cartridge, has in how many rounds without a break. Some shoot scenarios have been 10-15 shot strings of pretty rapid fire under time. Not much difference then Joe shooting XTC.

 

[tonysnoo]

With the speeds you are pumping out of your 6xc, I'm sure you could wring the speed out of your choice of the lot you mentioned. I never ran my 6slr much over mid 2900s with 115s...it was accurate and comfortable... Not to mention in a node.

As you probably already know, you can use your 6xc dies and plain vanilla 243 brass with no fire forming on a 6 SLR. No worries if you lose some brass. Just size some more and go hunting!

The other side of the coin... Correct me if I'm wrong, but I assume you could shoot factory 243 ammo in a 6cm(in a pinch)

 

[CJ6]

Something else to consider is what action ? The 6-284 (unless single loaded) is going to be a long action only with anything longer than about 87-90gr bullets. You may want to measure a dummy round to check your COAL with the other cartridges as well.

 

[Frankr]

thanks guy's your input is much appreciated.
CJ6 yea I been thinking a long action so i'm not boxed in.

tonysnoo the velocity I been getting out of my 6XC is slow as to what other's are getting.. but i'm only running a 26" barrel a tighter neck clearance, short throat ect. but I been very happy with it.

 

[tonysnoo]

thanks guy's your input is much appreciated.
CJ6 yea I been thinking a long action so i'm not boxed in.

tonysnoo the velocity I been getting out of my 6XC is slow as to what other's are getting.. but i'm only running a 26" barrel a tighter neck clearance, short throat ect. but I been very happy with it.

We have a couple 6xcs in our group. They haven't been able to get anywhere near that velocity out of them. When we tried RL 17 pressure signs developed pretty quickly. 2950 with 105-108s is where they work good (very good!) in our area. One of the reasons I went with my SLR. It runs another 100-200 fps faster with out issue. Good luck with your project.

 

[Frankr]

tonysnoo I guess that just shows you how different rifles can be. mine . RL17 at 41.0 grs was giving me a sticky bolt at 3,219 FPS but it shoot's ok with 40.5grs at 3,150FPS. was still shooting 3,150 at 37 deg F. It does seem RL17 shoots a little better when its colder. I expect it to drop to 3,100 around 0 deg F. but don't know that yet.

I will link you two articles. on RL17 they are quite old.

http://www.accurateshooter.com/cartridge-guides/6xc-for-competitive-shooting/
I can not get the second one to link, if you scroll down the first link page you will see click here for RL17 6xc results

[http://www.6mmbr.com/reloder17/url]