I want a 6mm that I can mag feed, and I want to push 105gr at 3000+fps

[omahaguy]

Im still on the ropes, I keep going between the 6xc, 6-47Lapua, a 243 wildcat, and the 6mmbr wildcats,

My main objective is reliable mag feeding,
second 2500+ barrel life
third 105gr bullets beyond 3000fps prefer 3100+fps

I have spent over a month reading dozens of articles from here and many other places, and the info seems to conflict, so I need some owners of these guns to set me straight...

Please help me make up my mind
Thank you all soooooo much..
Jerry M.

 

[GermanS1]

Jerry, you just can't have it all. The MV you want is incompatible with the barrel life you want, at least if you also include good accuracy at 600+ yards as a criteria and given the bullet, I imagine you do.

The 6XC will do what you want, load it at 2950 fps and you'll be as close as you can imagine to your goals. You ca push it past 3000 fps, but only your chrono and your barrel will know the difference, neither the target nor the wind will know.

 

[ollie]

For my 2cents worth i would go 6x47lapua. Mag fed great barrel life and good speed. The 243 wildcat AI will burn barrels befor it makes it to the 1500 round mark.

 

[JERRYHM]

Real results using a 6br dasher.


Sierra 115 gr 6MM bullet testing. 01-10-05

Test rifle is Barbara’s ”F” class rifle. Bat action chambered for the 6 BR imp,
The krieger barrel has 3449 rounds thru it, still shooting fair, but not as good
As when it had under 3000 rounds.

Shot at Sacramento: alt. is 200’, temp of 50 degrees, raining and no wind.

This test was at 100 yards bench rest. Both bullets jumping 0.020”.
Varget powder, cci-br primers, lapua brass, bullets 107 and 115’s .


Bullet – load – MV – ES – SD – group size

107 ----- 33.5 – 2953 – 09 – 03 – 0.330”
107 ----- 34.0 – 2998 – 14 – 06 – 0.294” NOT bad for 3500 rounds.
115 ----- 33.0 – 2874 – 14 – 06 – 0.485”
115 ----- 33.5 – 2914 – 15 – 06 – 0.332”





NEW BARREL


6BR IMP Broughton Barrel --- 25 JULY 2005

8 ½ “ Bat action Dual port
Broughton 6MM 8 Twist 5C 32” barrel
7.97 Contour .2430” X .2368”
D&B stock, NF 8-32X scope

Reamer used is the 6BR IMP UBL
Lapua 6BR Brass CCI-BR primers, Max L=1.560”, Trim to 1.550”
Neck dia. Sized = 0.266”, loaded = 0.268”, fired = 0.2715”

The OAL to touch the lands is 2.423” for the Sierra 107 grains.
The OAL to touch the lands is 2.430” for the Sierra 115 grains.
100 yard testing, elev. = 200’, temp = 90, humidity = 15%

Load Testing, fire forming
Varget 33.0 gr. MV = 3000 fps, ES = 19, SD = 09, 5 shot group = 0.160”

Load testing using the S107’s, jumping 0.015”
Varget 33.5 gr. MV = 3031 fps, ES = 22, SD = 05, 10 shot group = 0.330” **
Varget 34.0 gr. MV = 3073 fps, ES = 28, SD = 07, 10 shot group = 0.394”

Load testing using the S115’s, jumping 0.015”
Varget 33.0 gr. MV = 2950 fps. ES = 38, SD = 14, 5 shot group = 0.372”
Varget 33.5 gr. MV = 2978 fps. ES = 19, SD = 07, 5 shot group = 0.308” ***
Varget 34.0 gr. MV = 3025 fps. ES = 17, SD = 06, 5 shot group = 0.314” TOO HOT!

S107** 07-18-05 600 Yards 150-13X S107** 07-26-05 600 Yards 200-14X
S107** 07-18-05 1000 Yards 145-03X S107** 07-28-05 1000 Yards 197-07X
S107* 08-16-05 300 Yards 200-16X S107* 08-16-05 SR3/600 yards 148-05X
S115 ***08-14-05 1000 yards 200-14X S115 ***08-14-05 1000 yards 199-11X


Lapua 6mm 105 grain bullet test at 200 yards. 02-10-2006
Land OAL for the L105 = 2.400”
I found that the Varget lot used is much hotter than the last lot…….
I had two primers pierced when shooting the 105’s loaded into the lands.

Groups in the order they were fired, no barrel cleaning between groups…

LOAD –- OAL ---– MV --- ES --- SD ----- GROUP
33.5 -- .020 OUT – 3025 –- 06 –-- 02 ------ 0.570” USING SIERRA 107’S MY NORMAL LOAD

33.0 -- .010 IN –--- 3026 –- 08 –-- 03 ------ 0.299” ALL at 200 yards.
33.0 -- .020 OUT – 3022 –- 15 –-- 06 ------ 0.544”
33.5 -- .010 IN – ---3064 –- 20 –-- 07 ------ 0.639”
33.5 -- .020 OUT – 3064 –- 07 –-- 03 ------ 0.962”
33.0 -- .010 IN – ---3026 –- 16 –-- 05 ------ 0.440”
33.0 -- .020 OUT – 3020 –- 11 –-- 04 ------ 0.566”
33.5 -- .010 IN – ---3062 –- 20 –-- 07 ------ 0.854”
33.5 -- .020 OUT – 3070 –- 17 –-- 06 ------ 0.979”

 

[cmillard]

i think you might have some feeding problems with one of the 6 improved rounds. less body taper can mean a tougher time getting into the chamber.

 

[Erik Cortina]

My vote goes to the 6X47 Lapua, good speed, great brass availavility, and excellent accuracy.

 

[TRECustom]

A 6mm-06, 6mm-.284, .240 Wby, or a 6mm-.280 can all easily beat 3000 fps with a 105gr bullet, but won't make 2500 rd barrel life. They can be loaded down to 3000 fps and that will extend barrel life some. Maybe 1500 rds, or in a Lothar Walther 17-4 ph barrel, 2000 rds. In my opinion, the 6mm-06 or 6mm-.280 will feed more reliably than the other two and the 6mm-06 can use plentiful .25-06, .270, or .30-06 brass.
The .280 could too, but .280 brass is available, and .284 brass is also available. The .240 Wby brass is not as common and is more expensive. Also, there are a lot of Remington 700 donor rifles out there that are set up for .30-06 / .280 size cartridges. No bolt face or magazine modifications needed. Just true the action, add a premium barrel and a good stock, and you'd have a hot 6mm.

The 6mm-06 would be my choice for your other 2 requirements.


Just my opinion, Tom

 

[memilanuk]

My varmint/tactical rifle is a Stiller TAC30 action in an AICS 1.5 stock, with a 28" Lilja 1-8" tw 3-groove med. Palma contour barrel. Barrel was originally a 29.5" 6mm BR, set back at around 600rds and rechambered to 6-6.5x47L. Since then I have about 750rds through it, and it seems to be working just fine (so far). It feeds from the magazine as well as it did as a .308 Win, and pushes a B105VLD to ~3070-3080fps using 39.5gr H4350.

HTH,

Monte

 

[Steve Blair]

I get 3208 with Sierra 107 MK and 48.8 H4831 SC from a new 30" 6mm Remington barrel. My last barrel lasted about 1200 rounds. I hope this one makes it that far because most of my 6mm Rem barrels do not. I had a Remington 722 .244 that fed fine from the magazine with light bullets. Neither of my current 6mm rifles have magazines.

At the velocity that you are seeking, I cannot see how you will make 2500 rounds. Maybe you could investigate barrel nitriding. It is said to increase barrel life.

 

[flatlander]

The 6 Dasher is hard to beat - it offers a great blend of accuracy, velocity, efficiency, and barrel life. Jerry's figures are pretty typical, based on my own experience with five different Dashers. However none of mine are/were repeaters, so I'm not sure how well a Dasher would feed from a stock internal magazine. I know they work well from BO detachable mag systems, as well as H-S Precision DM.

I've also built & shot three 6x47 Lapuas, and have a good deal of positive experiences with them all. It feeds fine from a stock M700 internal magazine, and will give a little more velocity than the Dasher, at the expense of using about 12% more powder, and having a corresponding slightly shorter barrel life. I don't thing you'd be disappointed with either of these cartridges.

 

[Erik Cortina]

Let's not forget the 6BRX, I think it would feed better than the Dasher because it's shoulder is not as sharp but efficiency is about the same as the Dasher. Also no custom dies needed for the BRX, 6BR dies do just fine, except for full lenght sizing, use 308 body die for body and BRX body die to bump shoulder back, other than that it's easy!

Better barrel life than the 6X47 Lapua but not as fast, pick your poison!

-X3M

 

[rcw3]

Im still on the ropes, I keep going between the 6xc, 6-47Lapua, a 243 wildcat, and the 6mmbr wildcats,

My main objective is reliable mag feeding,
second 2500+ barrel life
third 105gr bullets beyond 3000fps prefer 3100+fps

I have spent over a month reading dozens of articles from here and many other places, and the info seems to conflict, so I need some owners of these guns to set me straight...

Please help me make up my mind
Thank you all soooooo much..
Jerry M.

Jerry

Please see this link - this does exactly what you want to do (been there, done that, it works).

http://www.6mmar.com/Super_LR.html

Be careful with the 6BR, Dasher cases if reliable magazine feeding is a primary objective. Also, if you are looking for 3000-3100 with the 105-108 gr bullets without being right at max pressures, you need some powder capacity so you are not running right at "red line".

Robert Whitley

 

[mj2evans]

I am shooting 243 AI with 105 AMax at 2950 (can go faster but this load produces sub .5 MOA). Feeding has been fine from an untouched Savage 308 10FP. Barrel is a 1-8" Shilen. I am sure it won't make 2,500 rounds even with me being very gentle.

 

[TonyR]

Robert.
How would your 6mm TurboAR cartridge do in a bolt gun with a long barrel?

 

[GermanS1]

Tony, funny you should mention that. I've been looking at my .22 PPC Quadlite and thinking that same thought. Too many other projects right now, though. If some left-handed shooter wanted to try it, that would make a good project. I'd sell the rifle quite resonably.

 

[Yellow11]

I went through exactly what your are going through back in July.

I settled for 6x47 Lapua and have only good words to say about it. Lapua brasses are of excellent quality, easy to source, easy to form, fps fits your requirement and it feeds from a magazine.

 

[TonyR]

German.
Looks like someone else already thought of it and done it. Check out John Crawford's 6mmAR at Ojai this past weekend in the Daily Bulletin. 2900fps with the straight 6mmAR. Should go faster with the TurboAR. Also
http://65grendel.com/forum/showthread.php?p=67001#post67001

 

[omahaguy]

I just heard that the 6x47 lapua are only making 1700 rounds, that is about what you can get from a .243win and the win with more case capacity should get the bullets especially the heavier ones out the tube faster..

All this make the 6xc look really good!!! Soon as my .243win barrel dies I believe this will be my new cartridge!!

 

[Erik Cortina]

I just heard that the 6x47 lapua are only making 1700 rounds, that is about what you can get from a .243win and the win with more case capacity should get the bullets especially the heavier ones out the tube faster..

All this make the 6xc look really good!!! Soon as my .243win barrel dies I believe this will be my new cartridge!!

I have to wave the BS flag on this one! How can it have the same barrel life as a 243 Win. when it is slower and holds less powder? Also, if the 6X47 Lapua is about the same capacity (little less actually) than the 6XC, how can that make the 6XC "look really good!!!", if you say the 6X47 is a barrel burner then the 6XC would be too.

You can't believe everything you hear you know!

-X3M

 

[omahaguy]

I was shocked to hear that about the 6x47 lapua aswell, but that is what a "claimed" person of firsthand knowledge told me over at I think benchrest central.
Be assured I am making no claims from my own exp, as I am new to this I am relying heavily on others who are far more knowledgable than I.
I now plan to shoot out my 243 win, then switch to the 308, if I do decide to persue a 6mm it will be an xc.
Thankfully I have found a new friend that has been a help to me beyond my ability to express thanks for....

thank you all for your help and advice I hope this thread may be helpful to others seeking the same advice as I..