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Campfire Ranger
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I'm thinking 1:10, expecting to use standard cup and core through about 80 gr. Sound right?
How about length? I'm thinking 22" sporterweight bbl?
Sycamore
...Actually Sycamore, you are sort of right....
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Campfire Regular
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Campfire Regular
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A 10 twist will definitely stabilize standard cup and core bullets to 80 grains. I verified that with 2 bullet makers (Hornady and another I forget). I had mine done at 1:9 so I could shoot Barnes and 100 c&c. 22" sporter weight would be a nice length and weight. I built mine on a Sako 461 so had the barrel done to that contour and length. The gunsmith finished it at 24 but with the short action length the barrel doesn't seem long. It's a great cartridge, I'm sure you'll love it when it's finished.
Frank
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Campfire Ranger
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Campfire Ranger
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I've got a 9" on mine at 21" long...
- Greg
Success is found at the intersection of planning, hard work, and stubbornness.
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Campfire Ranger
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Campfire Ranger
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Don't worry about 'over' twisting too fast, never had a problem with too fast a twist. A 9 will compensate for reduced speeds vs. a 243/6mm Rem. 21-22 is great, mine was a 21" 12 twist and it would max out at 85 BTHP for hunting accuracy which was the most bullet I planned to shoot, yet it preferred 70s much more, just as my first 6mmBR did, also a 12 ROT.
A 9 sound great, as even if you did an 8", not likely your case capacity will drive 105 VLDs or heavier fast enough when seated down in the case to make them viable.
55-85s is where I'd spend my time with a 45 or 6TCU, and H335 is a good place to start w/good brass (mine preferred Win/commercial vs. Mil-Surp).
Let us know how it shoots.
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Campfire Ranger
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...Actually Sycamore, you are sort of right....
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Campfire Oracle
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Campfire Oracle
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I just sent one out to become a 6mm/223 and went 1-8" twist. Don't be skeered of twist. Unless your building a BR rifle to shoot a specific weight/length bullet I'd always add a little twist.
A little extra twist is far better than being a hair short.
"Dear Lord, save me from Your followers"
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Campfire Tracker
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Campfire Tracker
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I had a 14" twist barrel on my 6X47 at 20" on a heavy barrel (to make weight), and I shot mostly hand-made bullets in the 60 to 70 gr range. The thought in those days was slower twist was more accurate (benchrest terms) In a sporter 10" twist would probably work well. It works well enough in my .243 and 6mm rifles. The "magic barrel length" from the Warehouse is 21.75". jim
LCDR Jim Dodd, USN (Ret.) "If you're too busy to hunt, you're too busy."
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Campfire Regular
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10 twist, you can shoot the heavies and you sure can't over spin the lighter bullets. I know, I have owned one on a AR15 platform.
All the best things in life, live on the other side off fear.
The true eye sees not the despair of its victims, only the elegance of equilibrium. It's a demonstration of superior judgment.
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Campfire Oracle
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Campfire Oracle
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I couldn't pay me to run a 1-10" twist
"Dear Lord, save me from Your followers"
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Campfire Ranger
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I couldn't pay me to run a 1-10" twist Is there a particular bullet you're planning on loading, that accuracy would be hurt by 1:10 ? Sycamore
...Actually Sycamore, you are sort of right....
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Campfire Ranger
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Anyone neck up nickeled 223 brass for 6x45? Easy way to keep the cases separated? Or more trouble than it's worth?
Sycamore
...Actually Sycamore, you are sort of right....
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Campfire Oracle
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Campfire Oracle
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I have and it necked up fine, though I have a general dislike for nickle.
My 6mm/223 arrived yesterday from the smith.
"Dear Lord, save me from Your followers"
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Campfire Outfitter
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Campfire Outfitter
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I had a 14" twist barrel on my 6X47 at 20" on a heavy barrel (to make weight), and I shot mostly hand-made bullets in the 60 to 70 gr range. The thought in those days was slower twist was more accurate (benchrest terms)
jim Ditto. I had the same chambering in the early 1970's for benchrest competition, a 6x47 w/a 1-14" twist and shot the best bullets I could find in the 68-70 gn weight. IIRC, I used 748, or 748BR powder, with Rem 7 1/2 primers. Don
Don Buckbee
JPFO NRA Benefactor Member NSSA Life Member
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Campfire Kahuna
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Campfire Kahuna
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Hmmmm.....
6x45, or 6mm-204....
80 grain TTSX....
Hmmm.....
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Campfire Ranger
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Campfire Ranger
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That bullet was accurate out of my 6x but it wasn't very fast...
It would be a 300 yard bullet in that cartridge before it dropped down below optimal performance velocity in my rig...
- Greg
Success is found at the intersection of planning, hard work, and stubbornness.
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Campfire Kahuna
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Campfire Kahuna
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6x45 or 6mm-204? Define "not very fast", if you can, please.
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Campfire Ranger
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Campfire Ranger
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6x45...
I could only get that bullet to 2730 in my 21"er with the powder that gave me the highest velocity across the board: H335.
- Greg
Success is found at the intersection of planning, hard work, and stubbornness.
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Campfire Kahuna
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Campfire Kahuna
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Having a hard time seeing where the 6x45 or maybe even the 6mm-204 would whoop on the .223AI and 75 A-Max combo, then.
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Campfire Ranger
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Campfire Ranger
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I'm not sure who said it would...
Keep in mind the above numbers are a sample of one...
- Greg
Success is found at the intersection of planning, hard work, and stubbornness.
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Campfire Kahuna
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Campfire Kahuna
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Understood completely, just an observation.
For a light, handy little walking around rifle, I think the .22" to .25"s on the .223 and .204 cases make a lot of sense.
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