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  #1  
Old 05-25-2015, 07:56 AM
southernman southernman is offline
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Default 6x45, or 6x47.

I have just put up a bunch of rifles and shotguns that aren't getting used/ or fit is poor, on consignment, and intend to replace them with a couple coopers, my first.
Intend to get a custom classic in model 51, was going with a .223, but cooper has 1-12 twist for .223, so am now concidering a 6x45 or 6x47.
mainly be used for varminting, but as I intend to move back to New Zealand in a few years, so will likely shoot goats and smaller fallow, sika deer as well.
looking for a bit of info, at what point will 6mm bullet weight be to heavy for the small case, Thinking a 75-80gr Balistic tip or similer, will be ok for small deer at moderate speeds, and 60-70 gr should be good for 300m or so for small game, and buck the wind well.
Is there any real advantage of going to the 6x47, over the 6x45 that has much better component avability.
thanks.
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Old 05-25-2015, 11:40 AM
william t. oviatt william t. oviatt is offline
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The 6z45 would be my first choice because as you stated, component availability! Second would be a 6TCU that would give you the 6x47 performance and the addition of fireforming your 223 cases....if fireforming is not a big deal go the 6TCU! Easier to get the TCU to feed in many actions over the longer 6x47, also.
Just my thoughts....I went the 6TCU route on a CZ 527!
Bill
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Old 05-25-2015, 12:20 PM
Spook Spook is offline
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+1 on the 6TCU, 6x45 from a component availability standpoint. I like a fast (8-9) twist for the 95 Berg or Sierra.
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  #4  
Old 05-25-2015, 12:56 PM
ab_bentley ab_bentley is offline
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6x45 with the standard 1-10" twist. IMO the case doesn't have the horsepower to use bullets above 87grs efficiently.

Adam
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Old 05-25-2015, 01:04 PM
ab_bentley ab_bentley is offline
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This was a green mountain barrel, 200yds, 22.5gr AA2200, 87gr VMax. My barrel is 19" long and the rifle wears a 1.5-5x20 Leupold.

Adam
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Old 05-25-2015, 01:30 PM
bumtownbutch bumtownbutch is offline
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Default 6x45 or 6 TCU

I have both. If I had to choose again, I would go with the 6TCU. The TCU I have is a Snowy Mountain action with a Krieger barrel; and it is amazingly accurate with unbelievable speeds using AA2200 and Sierra 55 gr. BlitzKing bullets. I use LC brass for both, with only the additional step of fireforming for the 6TCU.
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Old 05-25-2015, 01:53 PM
foxhunter foxhunter is offline
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all good advice, i use the 6x45 for whitetail deer, have shot several with the 80 grain sierra (2910 fps)with great results. rifle was a sako L461 with a 1-10 twist lilja barrel.
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Old 05-25-2015, 02:15 PM
dungheap dungheap is offline
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Coin toss, IMO.

Granted, .223/ 5.56 brass is more common, but you can make 6x47 (6/222Mag) out of 204 Ruger cases, also easy to get.

Accuracy and horsepower generally seem to be equal once you find the right load. Mine like 60gr Sierra HPs, 68gr anything and 70gr Speer TNTs.

I agree with AB Bentley concerning the 10 twist barrel.

One way or t'other, go for it and have fun!.
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  #9  
Old 05-29-2015, 01:06 AM
Johnly Johnly is offline
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Quote:
Originally Posted by bumtownbutch View Post
I have both. If I had to choose again, I would go with the 6TCU. The TCU I have is a Snowy Mountain action with a Krieger barrel; and it is amazingly accurate with unbelievable speeds using AA2200 and Sierra 55 gr. BlitzKing bullets. I use LC brass for both, with only the additional step of fireforming for the 6TCU.
I have rifles in 6x45, 6x47, and 6mm TCU and I would skip the 6x47 based on brass availability(unless you have a secret stash of the Federal Nickel brass made decades ago). My 6mm TCU rifles are wonderfully accurate, but they have really long throats, so a custom reamer or longer action might be needed.
My one and only 6x45 in on a 1/8 twist AR platform, and like my 6mm TCU rifles it has a long throat for the 107 gr. Sierra. Same deal, you would be best to purchase a reamer to your own spec if using a 223 length action.

John
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Old 05-29-2015, 01:54 AM
Old Hawkeye Old Hawkeye is offline
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Why go to a case that is in an obsolete cartridge (222 Rem Mag) & can have case availability problems. Go with the 6x45 & the 223 Rem parent case. All the 6mm TCU does is give you the fireforming step that is a total waste of time & money. The difference in performance is irrelevant. My 6x45 pushes 55's at 3200, 65's at 3150, 75's at 3100. & 85 grain Nosler Part & 85 grain Sierra Game Kings at 2950. Accuracy is great, recoil negligible, & it is a joy to shoot. For what you described as your quarry, I would go with a 75 grain Hornady SP, HP, or V-max. Any of these will blow them over. My favorite is the SP, but I can't find any right now. Go with the 10 twist. Forget about shooting bullets heavier than 87, performance is just not there. Just my two cents!!
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