6x47 issues

[6.5 shooter]

Hi folks,
I have a 6x47 lap shooting 105 amax which shoots very well. Its a no turn neck. I use imr4350 powder ignited by a rem 71/2 br primer. I get groups around .16 inch at 100 yards and es is 17 and sd 7.
I have heard a few people saying that the round is hardto tune and make accurate. I have not experienced this but what is the general consensus on this?
What factors attribute to this? Ie,
Should the flashholes be reamed?
Should you run a no turn neck or turn necks?
Primer choice?
Powder choice?

I have never had orshota 6br so I have no baseline to compare a 6mm round to so what are youre real world experiences over the accuracy comparison of the two rounds and has anyone gone back to 6br after using the 6x47?


Garry

 

[Eddie Harren]

Shooting in the "ones", it would be difficult to change anything at 100 yds. How's it doing at 300-600 Yds.?

 

[WyleWD]

Hi folks,
I have a 6x47 lap shooting 105 amax which shoots very well. Its a no turn neck. I use imr4350 powder ignited by a rem 71/2 br primer. I get groups around .16 inch at 100 yards and es is 17 and sd 7.
I have heard a few people saying that the round is hardto tune and make accurate. I have not experienced this but what is the general consensus on this?
What factors attribute to this? Ie,
Should the flashholes be reamed?
Should you run a no turn neck or turn necks?
Primer choice?
Powder choice?
Garry

Man, if it is shootin a .16.... DON'T CHANGE ANYTHING and don't try to over think it. It may not shoot that every day, but if it doesn't don't worry too much about it unless it starts to get out to a .3 or a .4 or larger all the time. As far as someone saying they are hard to tune.... well just remember some folks can mess up an anvil. I shoot against several 6-47 Lapuas and not one of the fellas had any trouble tuning them in.

Feed the rifle what it likes and don't try to fix what ain't broke. JMHO. WD

 

[6.5 shooter]

I havent had it out to 600 yet but at 400 its sitting around an inch.
Are the es/sd figures ok for this cartridge? I would like to try and get them a bit lower.
What sort of es/sd figures doe the 6br run at?
Im new to the 6mm scene so forgive my lack of knowledge. I shoot a 6.5x47 mainly.

Garry

 

[WyleWD]

The object is to shoot small groups..... which your rifle has demonstrated. And don't worry too much about them unless the group size changes drasticly. ES spreads on the 6br can run in the range you're seeing or much more. But again, the object is small groups, not necessarily low ES & SD values.

Depending upon lighting etc, the chrony can vary enough to raise an eye brow so keep that in mind when you're using it. WD

 

[CT10ring]

Garry,

Gee that sounds great to me. I am shooting 6X47 1/8 twist 105 Amaxes w VVN550 37.5g; not ever over a chrono...
Groups bigger than yours. Would you mind sharing charge weight experiences w the IMR 4350 you are using?

Thanks.

Bill W

 

[RJinTexas]

I had two 6x47's, one was a HV Bartlein 28" 8tw which would shoot consistently shoot sub 0.250" groups with 88fb Bergers, sold that one the other day. If it would have shot sub .2's it would still be in my gun safe. I also have a hunting rifle with a fluted light Palma 27", 8tw Kreiger that shoots the 105 Amax's consistently close to 0.250". Rifles that will consistently produce sub .2's don't come around everyday so enjoy it and don't change a thing! I'm shooting RL-17 and H4350 in my rifles.

RJ

 

[6.5 shooter]

Thanks for taking the time to reply fellas.
Im pretty pleased with the group size for a boat tail type bullet but its just the extreme spread which I would like to try and decrease.
What is the general consensus on flashhole deburring with this cartridge? I have k+m tools and can ream the flashholes if needed but I didnt so far, I just took the burrs off without pushing the reamer home and reaming the hole.
My imr 4350 load is 39.6grains ignited by a rem71/2 br primer. 3030fps from a 28" barrel.


Garry

 

[CT10ring]

Thanks, Garry for load info.

I am not an expert, but fwiw, I don't ream flash holes on my 6X47. They look really perfect to
me right out of the Lapua box. My 6.5 X 284 Lapua brass is a different matter.

Bill W

 

[Jazz]

It's kinda odd someone would think that they're having issues with a round that shoots in the 1's.....forgive me if I'm outa line here but most people would be asking questions to get to your point of proficiency. What do you want or expect?????......

 

[mattdienes]

since you have a GOOD base line for your accuarcy load,try changing primers-maybe a cci450 or wolf sm rifle? it will be pretty hard to beat what your getting now. FYI- I only use a chrono when changing powder lots or barrels as a comparison tool only.If it shoots small at 600-1000yds who cares what the es is!LOL ;D

 

[6.5 shooter]

It's kinda odd someone would think that they're having issues with a round that shoots in the 1's.....forgive me if I'm outa line here but most people would be asking questions to get to your point of proficiency. What do you want or expect?????......

Hi,
If you reread my original post you will see that im happy with the round. Im simply asking what is other peoples experience.
I just want to find a way to reduce es.

 

[6.5 shooter]

Thanks, Garry for load info.

I am not an expert, but fwiw, I don't ream flash holes on my 6X47. They look really perfect to
me right out of the Lapua box. My 6.5 X 284 Lapua brass is a different matter.

Bill W

T
No problem Bill, thanks.

 

[Jazz]

You're right, I read it wrong. Guess I was a little confused. ??? I just had a 6x47 chambered myself so that is why I read your post.

 

[flatlander]

My favorite powder in the 6x47 has been N160. I've tried H4350, RL17, and couple of other powders, but N160 remains at the top of my list. Gotta get some of the new Hybrids loaded to test, but still have several boxes of DTAC 115s to shoot up before I get too worried about switching.

Over the past couple of years, I've backed off some of the warmer loads in a couple of my 6x47s when accuracy wasn't quite what I needed, and that tightened groups up. Other than that, I'd say the 6x47 is no more difficult to tune than any other cartridge.

 

[Forum Boss]

Your ES = 17 / SD = 7 numbers are not bad at all. Keep in mind that there is some inherent error with ALL chronographs. I would not mess with the flash-holes. If you ream them to a larger size you will have to re-tune your load, in all likelihood. I have found that, with most flash-hole reamer tools, particularly those that cut a conical chamfer on the inside, that it is difficult to make every case the same. The result is that you may actually increase your ES/SD.

You can, of course experiment -- ream ten cases (no more!) and test those vs. your unreamed cases.

 

[Sgt 45]

How many rounds are you guys shooting in your groups? I'm lucky if I get under .4 shooting a 10 shot group.