User Panel
User Panel
User Panel
FL, USA
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Posted: 2/17/2017 3:44:39 PM EDT
Is there any real difference? If I get a 243 barrel with 1:7 twist would it essentially perform the same?
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Posted: 2/18/2017 7:56:50 AM EDT
[#1]
Yup pretty much the same ballistically. Almost like the .260 vs 6.5 Creedmoor debate. The Creedmoor is a little shorter so you have a shorter OAL to load heavier bullets but this can be taken into account and the .243 can be chambered accordingly. You will use slightly less powder with the 6mm Creedmoor but not enough to make a big difference.
7 twist is pretty fast though. Depending on the bullet you plan to use a 7.5 or 8 twist will work fine with 105-115grn bullets. |
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Posted: 2/18/2017 9:55:59 AM EDT
[#2]
What Rob said. If you're going to run the 110 SMK you'll want a 7, but other than that 7.5-8 is plenty. The 110 smk is longer than a 115 DTAC.
I'm running that bullet in a 6 creedmor this year and even with minimal freebore it is still going to have an OAL of 2.86. The creedmoor cases are a better design than the older 308, but the reality it doesn't matter much. |
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FL, USA
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Posted: 2/19/2017 11:47:46 AM EDT
[#3]
Just curious...I've noticed the phrase 6mm CM lately and after shooting my new Mossberg with these results was wondering about the Creedmoor. When I already have 243 brass and dies it would be a more logical investment to stick with that instead of going with a new cartridge. Just too bad the Mossy only has a 1:10 barrel. I got that group with 100 grain SPs so I was checking the book and it was recommending a 1:8 or 1:7 for 100 gr and higher.... |
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Posted: 2/19/2017 11:51:11 AM EDT
[#4]
Quote HistoryOriginally Posted By urbanredneck:
http://i67.tinypic.com/dcqys5.jpg Just curious...I've noticed the phrase 6mm CM lately and after shooting my new Mossberg with these results was wondering about the Creedmoor. When I already have 243 brass and dies it would be a more logical investment to stick with that instead of going with a new cartridge. Just too bad the Mossy only has a 1:10 barrel. I got that group with 100 grain SPs so I was checking the book and it was recommending a 1:8 or 1:7 for 100 gr and higher.... 1:10 will work for varmint type loads, but is going to be a no go for any long range work. |
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FL, USA
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Posted: 2/19/2017 12:51:36 PM EDT
[#5]
Quote HistoryOriginally Posted By TeeRex:
1:10 will work for varmint type loads, but is going to be a no go for any long range work. Wondering how far I could push the 100's before they keyhole? I picked that rifle up so my son can reach out further than his AR during deer season....so the heavier loads are more desirable with some of the fields that we are going to be hunting this year. |
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Posted: 4/3/2017 2:05:13 PM EDT
[#6]
Quote HistoryOriginally Posted By urbanredneck:
Wondering how far I could push the 100's before they keyhole? I picked that rifle up so my son can reach out further than his AR during deer season....so the heavier loads are more desirable with some of the fields that we are going to be hunting this year. |
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Posted: 4/3/2017 11:56:49 PM EDT
[#7]
With the .243 Winchester shoulder angle, it doesn't burn as efficiently and wears throats out faster.
ES will be tighter with the 6mm CM. 6mm CM with Lapua brass and the 110gr SMK or 115gr DTAC RBT are probably going to be the combos to beat this year and next in PRS. |
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