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new 6mm?

 
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  #8  
Old 12-27-2013, 05:52 AM
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Re: new 6mm?

ive got both a 240 and a 6mm rem. Loaded up to the cases show pressure signs and then backed off a full grain the 240 will beat the 6mm by an easy 200fps and with some bullets 250 fps. About the differnce between a 280 and a 7mag or a 06 and a 300 mag. If we worried about a cartridge thats over bore non of us would own a single magnum rifle or even some of the standard calibers like the 2506. The 6mm is a great round but its sure not the end of performance using a .243 bullet.
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  #9  
Old 12-27-2013, 07:51 AM
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Re: new 6mm?

Thanks for the responses. I'm not worried about barrel life, as here in the midwest we don't have tons of varmints to shoot, once crops are in its hard to find places to shoot ground hogs. I know the 105's will carry more speed down range past 500 and lest drift. What worries me is if I want to load some 55-70 grain bullets will a 8 twist be to fast and bullets not hold together at the higher velocities?
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  #10  
Old 12-27-2013, 09:18 AM
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Re: new 6mm?

My accuracy load in the 6-284 sent the 107smks down range at 3400fps.
It was perfect for antelope !
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  #11  
Old 12-27-2013, 10:17 AM
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Re: new 6mm?

Quote:
Originally Posted by RockZ View Post
My accuracy load in the 6-284 sent the 107smks down range at 3400fps.
It was perfect for antelope !
Thats a smoking load right there.
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  #12  
Old 12-27-2013, 02:20 PM
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Location: greenwood, IN
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Re: new 6mm?

Quote:
Originally Posted by lloydsmale View Post
ive got both a 240 and a 6mm rem. Loaded up to the cases show pressure signs and then backed off a full grain the 240 will beat the 6mm by an easy 200fps and with some bullets 250 fps. About the differnce between a 280 and a 7mag or a 06 and a 300 mag. If we worried about a cartridge thats over bore non of us would own a single magnum rifle or even some of the standard calibers like the 2506. The 6mm is a great round but its sure not the end of performance using a .243 bullet.
ponder this:

240 WBY cases are about as common as my ex wife's smile in court! The 240 will drive a 105 grain Amax to about 3250 fps max. The standard 6mm will drive the same bullet to about 3100 fps, but with about five grains less powder. Yet the 6mmAI will add another 150fps to the 3100fps and still be safe. But the other thing is that the barrel life is good. Looking thru three reloading manuals I see less than 100fps difference, but most often I find the 6mm on the anemic side. It's a true 65K psi round, and you gotta get that data. At 63K psi in the 6mm there's just not a serious lot of difference. Speer says it will do 3145 fps with a 105 grain bullet, and that's about right. I don't know how they managed that from a 22" barrel but they did. A 24" or 26" barrel will easily do that.

Still the real issue here is hitting something at five hundred yards. The 6mm will, and it's a maybe or maybe not with the 240 and all it's free bore
gary
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  #13  
Old 12-27-2013, 02:27 PM
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Re: new 6mm?

Quote:
Originally Posted by midwesthunter View Post
Thanks for the responses. I'm not worried about barrel life, as here in the midwest we don't have tons of varmints to shoot, once crops are in its hard to find places to shoot ground hogs. I know the 105's will carry more speed down range past 500 and lest drift. What worries me is if I want to load some 55-70 grain bullets will a 8 twist be to fast and bullets not hold together at the higher velocities?
I shot 80 grain Sierra Blitz's all the time in a nine twist barrel with zero issues. The 85 grain is better. A ten twist barrel would be about perfect for anything under 90 grains
gary
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  #14  
Old 12-27-2013, 02:28 PM
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Re: new 6mm?

Quote:
Originally Posted by RockZ View Post
My accuracy load in the 6-284 sent the 107smks down range at 3400fps.
It was perfect for antelope !
what kind of chamber pressure?
glt
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