Info. for 6 X 47 Lapua

[chino1969]

Fellow shooters:
I've just purchased a Kreiger 6mm 1 in 7.5" twist LV #18 profile 30" barrel. I was going to have it chambered in .243AI, but after getting opinions from other shooters, I'm considering a 6 X 47 Lapua. I want to shoot everything from 95 grn. up to 115 grn. bullets at 500 meters +. This rig will be used for live varmints and maybe groundhog shoots. I would appreciate any info. shooters have around this cartridge. Specific questions:
1) What reamer maker should I use and what freebore would be right for the above bullet selections? What neck diameter?
2) Who's making dies and what is the best way to go? Wilson, Redding, etc?
3) What kind of velocities and accuracy are you guys getting with the heavier bullets?
4) Just run the brass through a full length die, prior to fireforming?

Any other info. would be greatly appreciated.
Chino69

 

[billmo]

chino69, I can help with questions 2,3, and 4. Wilson and Redding are both making dies. Back in the summer I was getting 3060 fps with 105 gr. Berger VLD with app. .250 groups. That's it, just run it thru a Full Length die and fireform. Hope this helps. Bill

 

[SDWhirlwind]

I have put 2 together. Reamer was from PTG,Kiff) and his standard off the shelf at the time. No turn nk and I believe Dave said a .092 freebore which he claimed would work from 80-107 range.

First is a Krieger #7 8 twist @ 26". Have only shot 107SMK's. H4350 at 40.5gr fetched 3120fps.

Second is a Broughton standard Palma 5C, 8 twist @ 26". It won't take as hot a load with 40gr being max of H4350 with MV of 3040.

Both shoot extremely well. Both stainless, same reamer and will chamber same brass so headspace, etc is for all practical purposes identical. Thought perhaps the Broughton would be faster but it isn't or at least with H4350 it isn't. Haven't tried moly nor lighter bullets yet. Built them for longer range coyote hunting.

Hope this helps.

Respectfully,
Dennis

 

[chino1969]

Bill and Dennis & RCW3,
Thanx for your input.
Chino69

 

[rcw3]

Chino69

My personal opinion of the 6x47 Lapua is that it is good for bullets up to those in the 105-108 gr range. The 115's in my opinion are too big a bullet to be effectively driven by the case,out of balance situation, too big a bullet for the powder capacity, not that you cannot shoot them but you won't gain anything over a 105-108 gr bullet at 600 yards and under since you can run the 105-108's faster and easier and they are more shootable).

If you run a one and a half degree throat angle on your reamer a freebore in the .090" range will be good for bullets up to 108 gr. If you need to set up the reamer for the 115's, you're going to need to add a good bit more to the freebore, then bullets like a Berger 105 VLD will be way up into the neck of the case. Necked down brass measures around .270" loaded so if you want a "no neck turn" for factory brass, I would try something around a .273" neck.

You may want to look at a website I have some info on at: www.6mmHOT.com

Robert Whitley

 

[chino1969]

Chino69

My personal opinion of the 6x47 Lapua is that it is good for bullets up to those in the 105-108 gr range. The 115's in my opinion are too big a bullet to be effectively driven by the case,out of balance situation, too big a bullet for the powder capacity, not that you cannot shoot them but you won't gain anything over a 105-108 gr bullet at 600 yards and under since you can run the 105-108's faster and easier and they are more shootable).

If you run a one and a half degree throat angle on your reamer a freebore in the .090" range will be good for bullets up to 108 gr. If you need to set up the reamer for the 115's, you're going to need to add a good bit more to the freebore, then bullets like a Berger 105 VLD will be way up into the neck of the case. Necked down brass measures around .270" loaded so if you want a "no neck turn" for factory brass, I would try something around a .273" neck.

You may want to look at a website I have some info on at: www.6mmHOT.com

Robert Whitely

Bob,
Thank you.
Chino69

 

[tripcrow]

I went with the Forster Ultra FL die set and also use a Redding Bushing die for the 6.5x47.

 

[billmo]

chino69, Don't know how much difference there is in your chamber and mine because I have a 6 X 47 Shehane but VV-N560 works really well for the 105 Berger VLDS. My rifle is not at max. at 41.0 gr. with bullets jammed .010 I am also using CCI 450 Mag. primer which is the reccomended primer by Bill Shehane and Robert Whitley. Please back off of my load a couple of grains and work up. Mileage may vary according to your chamber. Bill

 

[billmo]

There is a bit of load data info on the blog for the new IMR-4007ssc. 39 gr. under a 108 gr. bullet. That should give us a good start point. Bill

 

[Obtunded]

My 6X47 results have been a disappointment....

Yesterday I went to the range for the day to break-in the barrel,I don't generally subscribe to this, but, anyway, I broke it in) and to begin my load development.

I ended up leaving my comparator at home which was probably contributing to the problem, but I digress.

My barrel is a Krieger .236 4 groove, 1:8 and is chambered with the 105 reamer spec'd on 6mmhot.com straight from Dave Kiff. Gun builder raved about the zero run-out and absolute straightness of the barrel from Krieger.

I started with 105 Lapuas at soft jam and went for optimal grouping based on powder volumes. There was not a significant difference with any, but the 38 grain ~3000 fps group was the best.

I then started jumped and went,based on the micrometer die... no comparator) jammed up to 20 thou. Marginally better at 15 thou in.

I then repeated the process with 105 Berger VLD's - 1MOA at best.

Repeated with 108 Bergers .75MOA

If this gun has a sweet spot, I have yet to find it. This is quite different from a 6BR where you find 2875FPS and jam it 10 -20 thou and viola!

One thing I did discover in goofing around with brass is you can,if you want) do everything except FL resize with 6BR dies. I used a 6BR body die to resize the necks as an intermediate step before running them through a 6X47 FL bushing die... This all but eliminated a "donut".

 

[billmo]

Which powder were you using man? Is this a no-turn neck chamber?I have the same barrel but my chamber is .270 so I do have to take a little off of my brass to get it down to .268 loaded rd. measurement and I have used Berger 105 gr. VLDs - .010 jam up until now. Bill

 

[Obtunded]

I've been using H4350 and it is a no-turn neck. when I get another day to go play I'll work on it more, including trying fire-formed brass instead of out-of-the-box neck sized brass.

 

[billmo]

That should make a diiference. When I first broke in my barrel and was fire-forming my groups were not near as good as they are now. I have shot my rifle about 160 times and it seems to be doing fine. No fouling to amount to anything and accuracy is there when I do my part. Bill

 

[Obtunded]

Well that's good news. Hopefully that makes a difference.

Cheers,

Ian