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Fav powder for a 6-284 29" barrel

 
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  #1  
Old 05-13-2011, 03:53 PM
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Fav powder for a 6-284 29" barrel

So far the best accuracy I've got with 107 gr sierra mk is with H1000 55 gr but I'm only at 3150 fps from my 29 " lilja.

Is there a better powder suited to my outfit? I've tried rl22 53 gr and it's too hot with 95% capacity
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Old 05-13-2011, 06:20 PM
TH TH is offline
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Re: Fav powder for a 6-284 29" barrel

I would use R22 drop it down to 52 grains. I shoot the 107 smk at 3400 out of a 32 inch barrel. Use a standard 210 match primer
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  #3  
Old 05-13-2011, 06:28 PM
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Re: Fav powder for a 6-284 29" barrel

I shot Retumbo out of mine. I was getting best accuracy with the 115vld at 3175 but have run them up to 3300 fps.

This was out of a 32" 8 twist Broughton 5C
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Old 05-13-2011, 07:56 PM
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Re: Fav powder for a 6-284 29" barrel

Quote:
Originally Posted by TH View Post
I would use R22 drop it down to 52 grains. I shoot the 107 smk at 3400 out of a 32 inch barrel. Use a standard 210 match primer
before my rechamber job(the smith throated my chamber too far) i used 56.5 gr rl 22 and while it was hot the bigger problem was the bullet coming apart.

My primers I used were cci br2. I'll try reducing it(rl22) and see. The h1000 is producing super accuracy. I recently joined a shooting range while I'm out of town working and I finally have the place and the time to shoot this rifle I put together in 2003. This week I shot out to 700 yards, and trying to build a drop chart. I'm guessing Im getting around 3100-3200 fps and right at 1/2 moa. at 300 2 shots were almost touching then they started to open up. 400 - 2". 500 - 3.5". 600- 3 5/8" 700 -4".

It was late afternoon with a breeze quartering away from right to left about 5-8 mph. The mirage was pretty bad. It seemed as though the target was floating. This weekend Im gonna load up some more and shoot next week at 5:30 am and see if I can shrink those groups up some.
My scope is a nightforce benchrest 12-42x. I may think about selling it and replacing with a comporable Leupold with the side focus knob. I have one and really like it.
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Old 05-14-2011, 07:56 PM
TH TH is offline
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Re: Fav powder for a 6-284 29" barrel

Nothing wrong with those groups. You might want to try new brass. After 56 grains of R22 I do not see those cases holding up. Let us know your results next week at the range.
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  #6  
Old 05-14-2011, 11:46 PM
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Re: Fav powder for a 6-284 29" barrel

Totally suprised you had the 107 gr SMK come apart. I built myself a 30" Lilja barreled rifle with a 1-8, 3 groove barrel. About the hardest barrel there is on match bullets. I cut my throat very long as this is a single shot rifle. Base of bullet shank seated flush with base of neck.

My standard load for three seasons was 57.0 gr RL-22 which was good for 3580 fps. Yes, thats correct, 3580 fps average and velocity spreads were in the mid teens. Accuracy with this rifle was outstanding. The harder I drove them, the better it got. It would EASILY beat 1/2 moa and generally ran in the 1/4 moa range out to 500 yards. Past that, in good conditions, it was not hard to hold 1/2 moa.

Never once did I ever have a bullet failure. After three seasons the bore was starting to get some serious heat cracking for the first 7-8" of bore. Fearing I was about to loose a very good shooting barrel I decided to drop the charge to 55.0 gr which still produced 3450 fps. In comparision a very comfortable load. Accuracy may not have been quite as good but I believe this was due more to the worn throat more then the reduced load at this point.

As far as case life, even at the top pressure loads I was getting 5-6 firings per case with the modified Winchester 284 cases.

I have always liked the old Win 284 cases. They support alot of pressure and are much better quality then most would have you believe. Not as easy to form but not that bad at all with a neck bushing die to step them down a bit.

Since then, I have built a couple dozen 6-284 rifles with 28 to 30" Lilja barrels. I have since switched to the 1-9 barrels as they are plenty for the 107 gr class bullets and are easier on the thinner jacketed 105s from Hornady and Berger.

In my testing, my velocity results of this first rifle were not uncommon, nore was the accuracy.

Again, I am suprised your seeing pressure signs with 53.0 gr RL-22. You must have a very short throat length. Another thing that could be the problem, check to make sure you have proper neck clearance. You should be able to push a bullet through a fired case neck without much resistance at all. If you can not or there is noticable resistance, your neck diameter in the chamber is to tight and you will need to turn your neck thickness down.

All this said, your rifle is shooting extremely well, sometimes its best not to look to hard for greener grass and realize what you have in front of you. Yes your velocities are a bit off average for that barrel length but accuracy is far more important then shear velocity.
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Old 05-15-2011, 02:13 AM
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Re: Fav powder for a 6-284 29" barrel

you may not remember Kirby, but we had several email conversations around 2002. Before you started your smithshop. Dan Olsen did the work as I believe he helped you with one of your rifles, and you recommended him to me. THe first chamber he cut was throated really long and it was MY belief at the time that I had to nestle the 107mk against the rifling, and I had to seat them too far out. I sent the barreled action back to him and he cut some of the barrel down and rechambered. My OAL is right at 3" for the smk's. I made up some more ammo this afternoon, and will attempt to shoot early before work this week if conditions are favorable.

Some of the primer pockets are started to loosen up on my old 284 WIN brass, but I've got 4-5 firings out of them. Not sure if he meant too, but when Olsen cut the chamber he left a small machining mark about 1/8" long right below the shoulder. I can count the marks on my brass to see how many times they've been fired. Several years ago I bought some Norma 6.5 x284 brass thinking maybe it was better than the Winchester stuff. It was easier forming down to 6mm. I have redding bushing dies and a small base die(that i used today as the bolt was getting tight on some brass) my chamber neck is .268 if memory serves me and the bushing im using is .263 It probably springs back .001 or .0015 and then .002 neck tension has .0015 or so left to let the bullet go.

Runout on most fireformed loaded rounds are .002- .004 and new unfired formed load can be as high as .01


like you said though, I'm getting close to satisfied with the rifle because they more load development I do the less barre/ accuracy I have left to enjoy.

Last weeks shooting conditions were far from ideal, and I dont have a lot of experience doping wind and/or mirage. Bullet holes at 300 yards were touching, then as the length increased the groups did also.

I am working about 45 minutes from Wenatchee WA and I hear there are Rockchuck opportunities around. But getting someone to divulge their honey hole may tax my people skills.


BTW, thanks for responding and getting my hooked on the LR bug.lol
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