Need a starting load for 6x47 L using 105 Moly Bergers

[donws2]

Hello,

"I asked this on the reload page also"

I just picked up a used BR rifle in 6x47 Lapua. It came with some 90 grain Bergers already loaded and they did very well; but, I only have some 105's Bergers and 107's on hand to play with until I get some 90's. The barrel is a 1 x 7.5 twist so I believe the 105/107's should work fine and I would like to use the 105's as they are moly coated and the rifle has been only fired with moly bullets. With a 30" 7.5 twist barrel what loads would you all use with either 4831sc or Varget. I'll be starting low and working up to max and looking for the best groups not the most speed. Brass is Lapua 6.5x47 already necked down and not turned. Primers are Winchester SR and Remington. The primer,powder and bullet choice are components I have already on hand. I've order some 115 DTAC's BN and some 90 moly's but will not have them by this weekend. I'd like to try the Reloader 17 also but no one has any in stock at the moment it looks like. Any help would be great, Donald

 

[butchlambert]

Try this:http://www.websitetoolbox.com/mb/6mmbr?forum=12199,
go to the home page of the forum and read the RL17 info there.
Butch

 

[flatlander]

Varget is faster than ideal for heavier bullets in the 6x47, and 4831SC is a little too slow. My best results have been with Vihta Vuori N160, which works very well with 105, 107, and 115gr. bullets. Your 7.5-twist bbl. will work great with Berger or DTAC 115s, and 4831SC may give decent results with these heavier bullets. I went as far as 42.6grs. of 4831SC w/DTAC 115s before going back to N160, which gives higher velocity and better accuracy in my first 6x47. That SC charge gave 2925fps & mediocre accuracy out of a 30" 8-twist .237" bore barrel, while N160 gives over 3000fps and very good accuracy out to 1000yds.

I'm currently testing RL17 with 115s,both Berger & DTACs), and it's looking very promising. If you can get some of this stuff out of the next shipment, you owe it to yourself to try it.

 

[shoerjbh]

I've been winning a few matches,200,300 and 500 meters )
with 38.5 or 38.8 4350. that is a light load.

If you want more velocity jump up to 40 to 40.5 of 4350 .
in my two rifles both are 1in8 twist

The one with the Krieger barrel 25 ins.-long likes the 38.5 or 40.5 .

The other one with a Broughton barrel 28 ins likes the 38.8 and 40.1 .

Hope this helps
John

 

[donws2]

Butch I've read the review twice and I did not find in it what I was looking for. Maybe I missed it. I'll go back over it when I get a chance.

flatlander I like your handle. I'm a hillbilly and that's the nick name we've given the people that have the misfortune to live on the flat lands below. I've read quite a bit about N160/N550, more about the 550, and it all seems interesting. I don't have any Vihta vuori in house and the nearest source is two plus hours drive away. I'm not to keen on paying the hazmat for a pound or two so It'll have to wait until I come down the mountian to score some n160. I do agree with your accessesment of the other powders from what most have posted on here and other sites. It's looking like 4831 and Varget are going the wrong way. A friend has some N550 and N560 I could try and I've got a shop just ten minutes from the house that has H4350 in stock at 27$ a pound. How do you feel about the other two Vihta Vuori powders? I may go ahead and load some 105s at 39 grains of 4831sc just to see where they go. Thanks for your reply and good shooting you've got me thinking which could be dangerous. PS. please post your work on the RL17 if you can I'm still very interested in that for my 6x47 and my Rem. 40x in 6br. Donald

John I've desided to try the 4350. I can get some tomorrow at a local shop and from what I've found out so far my first plan of varget or 4831 may have been poorly thought out. And you can never have enougth powder on hand. I had thought about starting at 39.0 of 4350 from what I found on other sites/pages but think that may be a little high from what your saying as a start load. You did not say if your using 105's or 107's or if they are moly or not. Could you share that as it would help me to settle on a starting point. I'm looking forward to putting the rifle trough her paces when I get her dialed in. Where are you shooting matches at? Congats on your wins I'm hopefull myself. Donald

 

[donws2]

To flatlander and John. I took a chance and went to a shop a little farther from my house than the one I was going to. Got 2 lbs. of N160, N550, H4831sc and five pounds of H4350 and Varget. The Vihta Vouri was 25.00 bucks and the others where 17.00 and 19.00 a pound. This was last years stock in a older gun shop/hardware store a friend suggested last night. Well worth the extra hour drive as the Hogden is ten dollars a pound cheaper than my local shop. Well it's time to load and go. Will post how the 160,550 and 4350 do with 105's next week. Donald

 

[riemer]

I have had good luck with H4350 and N550. N550 gives lower velocities though. I shoot H4350 39.7 105 Berger CCI450. 95 grainers shot very well with the same powders.

 

[flatlander]

Donald,
I think you're right about H4350 - 39grs. was close to max with the only 6x47 bbl. I've shot 4350 in.

So far, I've worked up to 40.8grs. of RL17 with moly'd Berger & DTAC 115s in the same 30" Bartlein bbl. I mentioned earlier. That charge gave 3088fps with Bergers, and 3093 with DTACs, using Wolf SRM primers. As a side note, 40.5grs. the previous day gave 3095fps with DTACs; temps both days were 75F. Whether the lack of increase in velocity with the extra .3gr powder is significant - i.e. indicating that max charge has been reached - or is just the result of shooting on a different day, I can't say. Only fired five rounds of each load, and that's not enough of a sampe to mean much. OTOH, the Wolf is a 'soft' primer, relative to R 7-1/2s - IOW, the 7-1/2 throws a lot more flame and has given excellent results with slow powders in the 6x47 with its small primer pocket. My next round of tests with RL17 will be with the 7-1/2.

I think N550 is faster than optimum for the 6x47 - if I were going to try a 500-series powder in this cartridge, it'd be N560. However, given the accuracy with N160 in both my 6x47s, I'm not willing to pay a premium price for 560 just to get another 50fps or so out of it. As far as that goes, I'm not sure RL17 is going to be the powder of choice in my 6x47s either - N160 is giving within 60fps of the velocity I'm seeing with RL17, and the RL17 loads are showing more vertical spread than N160. Need to do more testing with other primers while there's still plenty of summer heat.