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243AI or 6mm-284?

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Unread 02-11-2009, 08:21 AM
Silver Member
Join Date: Mar 2005
Location: Boise, Idaho
Posts: 149
Re: 243AI or 6mm-284?

I own one of each, with heavy bullets the 6-284 is awesome ! Go for it.
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Unread 02-11-2009, 10:42 PM
Platinum Member
Join Date: Dec 2005
Location: Tucson Az
Posts: 2,063
Re: 243AI or 6mm-284?

Great thread. I have been pondering the "next one". A 105 or heavier bullet in a 6mm is appealing. I too have quite a bit of 284 brass. A few hundred that are already 25-284 just begging to be necked down one more time.

Several posters said they can get 3200-3250 with a 105-107 gr bullet. That must be a load that is deliberately downloaded slightly for longer barrel life, right? I say this because I was reading about the 6XC getting as high as 3300 with a 105 gr bullet, RL-17 and a 30" barrel Alliant Reloder 17

I wonder if RL-17 would be useable in the larger 6mm-284 case.


With your brother-in-law's 1 in 8 twist I would be inclined to use the DTAK 115 with its .585 BC


Taken from 6mmBR: BALLISTICS:

"The 115-grain DTAC has approximately 10 points lower BC than a 142gr 6.5mm Sierra. Everybody's BC calculations vary so I believe this is the best way to evaluate it against the 142gr 6.5 Sierra. (Also if you look at the Berger 115gr 6mm keep in mind that Bergers BC's are not conservative at all.) This means that if you shoot the DTAC 115 at 3000 fps verses the Sierra 142 at 2950 fps then the drift at 1000 yards is virtually the same.

[Editor's Note: Henry Childs has confirmed the BC figure David is proposing. We suggest you use a .585 BC for the 115gr DTAC.]"


Just imagine that bullet with more case behind it. A max load of perhaps 3150-3200 with the 6mm-284?

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Unread 02-12-2009, 07:41 AM
Silver Member
Join Date: Jul 2007
Location: SW Wisconsin
Posts: 225
Re: 243AI or 6mm-284?

And a 30" 5R barrel.... We'll see. I have it chambered, and the stockwork is coming up...we'll be shooting it this spring.
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Unread 04-20-2012, 05:22 PM
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Join Date: Apr 2012
Posts: 1
Re: 243AI or 6mm-284?

can some one help me ont and tell me were i can buy 6mm284 empty brass at thank you
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Unread 04-20-2012, 05:30 PM
Platinum Member
Join Date: Dec 2005
Location: Tucson Az
Posts: 2,063
Re: 243AI or 6mm-284?

Wow this is an old thread! I DID make a 6mm-284 with a 30" 5R Bartlein 1 in 7.5 twist. Never got the intended 115 DTACs to shoot. The 107 Sierra load came together quickly and was accurate. When Berger came out with their 105 hybrid switched to it. Currently still using the hybrid. FYI RL-22 and Retumbo gave very similar velocities and accuracy.

As to most recent poster's question: Where can you get 6mm-284 brass? You have to neck down either 284 win brass or 6.5-284 lapua or norma brass. I would suggest you use Lapua.
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Unread 05-12-2012, 02:55 PM
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Join Date: Aug 2005
Posts: 558
Re: 243AI or 6mm-284?

YES AZShooter this is an OLD thread !!!

You mention RL 22 and Retumbo, RL22 has worked the best in mine N165 and H1000 also showed promise. Retumbo was the worst powder by far in mine, each barrel likes something different.
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
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