I am planing to rebore a 223 to a 6x47(222Rem Mag case) using a 1-14" twist and 55 to 60gr Moly plated bullets. Any advise on powder, expected Vel. This will strictly be a med range varmint rifle.The action and barrel are H&R Ultra break open single shot, 24" bull barrel. I am not happy with the accuracy of the 223 barrel.

Why such a light bullet? I don't know of any 6mm bullets that light, but i am not familar at all with factory bullets. I would think that a 65 to 70 gr. bullet would be a lot better, especially with a 1-14 twist.

zermel

With the 6 x 47 and a 14 twist barrel I don't think I'd go more than 70 grains of bullet. Depending on the elevation where you shoot stability could start getting borderline after that. Berger makes an excellant 60 grain MEF bullet that I use in my 6PPC all the way out to 300 plus yards. It is very accurate, and deadly. A lot of guys like the 55 grain Blitz King.Powders for the 6 x 47 are pretty much those used in the PPC. 4198, 322, N133, etc. You should get 3000 to 3400 fps with the lighter bullets depending on barrel length. Use RP brass rather than the Federal nickled stuff unless you've already bought a bunch. If you have access to back issues of HANDLOADER magazine, the May 1985 has an excellant article on the 6 x 47. The latest Sierra manual also has a bunch of loads. Good Luck.

Ray

If I remember correctly, the H&R 317 is built on a Sako 461 action. If so, the 6x47 will absolutely not work through the action. You will have a single shot. Been there and done that. I had the barrel on mine set back and cleaned up to a 6x45. If you are goint to rebore, simple bore to 6mm and have a neck and throat reamer run in to make a 6x45. I've had both (now have two of the latter) and there's not much difference between them.

Incidentally, if you're thinking of really light or deep seated bullets to overcome the length problem, that won't work either. I tried that before the rechamber.

Art, I think that he is talking about the break open receiver, not the bolt action receiver. Butch

Sorry, when I saw the H&R Ultra, I was thinking of the high end bolt varmint rifle they sold back in the 60's/70's. I think it was designated the 317 Ultra.

Yes Butch.

I am talking about that cheap H&R single shot. I have another one I had rebored in 257 Roberts.
Its a great little gun and shoots realy well after some very extensive tweaking. Switched barrels with a guy a 25-06 for a 223. But a 1" 223 does not really turn me on.Hardly good enough to hit a gopher at 100 yrds.

The small base cases work much better than the standard 06 base in an H&R. I sort of thought the 6x47 would use powders like the 6ppc. I tried the 55gr NoslerBT in my 6ppc BR rifle and they shoot pretty good in a 1-14 twist with N133.

Butch I got that Culver conversion all set up but each click with N133 do .3 to .4 only but it is very consistent Fred M.

quote:

Originally posted by Art S.:
If I remember correctly, the H&R 317 is built on a Sako 461 action. If so, the 6x47 will absolutely not work through the action. You will have a single shot. Been there and done that. I had the barrel on mine set back and cleaned up to a 6x45. If you are goint to rebore, simple bore to 6mm and have a neck and throat reamer run in to make a 6x45. I've had both (now have two of the latter) and there's not much difference between them.

Don't mean to start an arguement, but I have two factory .222 Magnums (same case as the 6x47) in the Sako L461, and there is adequate magazine room, even with 55 grain Nosler Ballistic Tips which are quite long for a 55. If the intent is to use bullets of less than 70 grains in a 6 x 47, then I don't see why the L461 is not adequate. On the other hand, if you intend to shoot 100 grain Partitions, neither the 6x47 nor the 6x45 will have enough magazine room in the little Sako.

6 X 45 (.223 case) loading data is available from Hodgdons and 55-58 grain bullets can be driven real fast for varminting. Other bullets will work well on deer as a ladies/youth round for low recoil.

Dies are off the shelf in this cartridge from RCBS

I built mine on 1:14 twist and would do 1:12 next time.

quote:

Originally posted by vapodog:
6 X 45 (.223 case)
I built mine on 1:14 twist and would do 1:12 next time.

Why would you change to the 12" twist. For a small case I don,t see to go for heavy bullets?
Or is that you can,t push the bullets fast enough in a 14" twist?
Fred M

Stonecreek

I believe the 222Mag L461 may have had a slightly longer magazine than others. However, they are relatively rare, and most(notice the qualifier) 461 actions will not work without modifications. Also, not only are 6mm bullets longer, as evidenced by their higher sectional density, but the case is longer because necking up lengthens the case. The net result is that, on the rifles with which I am familiar, even 70 and 75 gr bullets gave problems unless seated so deep that the ogive entered the case mouth, at which point feeding problems ensued and powder volume is impacted. The 6x45 is short enough that I have been able to use 85 gr bullets with no problems.

Regarding twist, I used to worry about this, but unless you are talking about a competitive bench rest rifle, I have never seen enough improvement to warrant giving up the ability to use heavier bullets. I would never go to a 1:14 twist in 6mm. I personally think 1:12 is marginal with some 85 gr bullets. Remember that a 1:12 twist killed the .244 Remington and forced it to be re-issued as the 6mm. The original was only available with 90 gr factory bullets, and would not stabilize a 100gr. To me, that says that the cutoff for a 1:12 is around the 90 gr mark. I would go with a 1:10 in any hunting/varmint rifle and be sure. If the intent is to shoot the new super lightweight 6mm bullets, do yourself a favor and shoot the 222Mag. The whole point of a 6mm over a .22 is the increase in sectional density and BC, which yields less wind drift. This benefit is gone with bullets below 75-80 gr.

quote:

Originally posted by ZERMEL:

quote:

Originally posted by vapodog:
6 X 45 (.223 case)
I built mine on 1:14 twist and would do 1:12 next time.

Why would you change to the 12" twist. For a small case I don,t see to go for heavy bullets?
Or is that you can,t push the bullets fast enough in a 14" twist?
Fred M

I went to the slower twist originally to try and get a little more velocity on the lighter bullets but didn't achieve any. The 1:12 will do all the 1:14 will do and allow me to shoot heavier bullets if I choose.

My reasoning to go with a 1:12 next time is simply that I believe I got nothing by using 1:14 the first time.....if that is rational.

vapodog.

That sounds resonable, my thought were the 1-14 would give better accuracy with the lighter bullets, ala 6ppc most are 1-14 for BR and 66gr bullets.

Also for a hunting rifle I can see the 1-12" to be more adventageous.

Thanks for your comments.

Fred M.