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.243 ai vs. 6mm-284

 
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  #1  
Old 11-26-2007, 03:43 PM
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.243 ai vs. 6mm-284

Hey Guys, new here to the forums. I hate to post a new tread on an old topic; especially on my first post.

I pretty much had my mind set on a .243 ai, but after seeing a post about the ultimate 1000 range varmint rig I started to reconsider and had a few questions. I'm planning to build on rem adl short action. I know the 6-284 will fit, but am not sure if i will be able to play with the seating depth and different bullets all that much (100gr factory 6mm ammo clears mag. but is close) especially with ballistic tips I know they are usually a little longer than plain old soft points.

Quote:

"The 6x284 is number 1 because of the combined qualities; Velocity, Accuracy, Retained energy down range, Low recoil and brass selection."

I know that greater impact velocity = greater energy, but how much more powder does the 6-284 use to gain how much more velocity over the .243 ai. Better retained energy usually comes with heavier bullets, and brass selection is not to great either. i already have 243 brass and making brass is alot eaiser and cheaper for the 243 ai. Small gains probably wouldnt be that impessive to me, but it sounded like the 6-284 might have some real advantages over the 243 ai. i also feel like the .243 ai would burn powder more efficiently due to a shorter stubby case.

I'm not tring to start a ******* contest here, but I would like to here some 1 elses opinion berfor I make a final decision.

I guess i should add more info on what im planning for my build. a 24" barrel with a 1-10 twist and plan on using hornady 87gr. v-max or 87gr. bthp. longest shot ever taken was around 450yrds so not so much of a 1000 yrd. gun. More like 500-750; 800 yrds tops or else i would get faster twist and hevier bullets.(knowing my gun could pull off a shot like that would be awsome). I dont want to go smaller on the bullet weight either cause i might have to shoot the ocasional deer with this rifle. Also curious if any one has shot a yote with a barnes tsx.

I apoligize for the long post, I just sort of kept going.
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  #2  
Old 11-26-2007, 10:08 PM
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Gosh, i joined the forum cause i couldnt find a search feature and overlooked it after i became a member. I have found alot of the answers that i was looking for now, but am still curious about just how close together these cartridges are. Since i'm going through the trouble and expence to build my ultimate yote/deer rifle i couldn't bear the thought of knowing that i could have gone with something slightly better. I'm hoping to achieve a muzzle velocity of 3400fps with an 87gr. bullet and be able to shoot 1/2" - 1-1/2" groups out to 300 yards. To me this seems pretty realistic any faster and i would be concerned about the bullet coming apart faster than it should on deer sized game. Load data on either of the two would be appreciated
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  #3  
Old 11-26-2007, 11:58 PM
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Join Date: May 2007
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Look here:

RELOADING
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  #4  
Old 11-27-2007, 08:48 PM
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thanks for your reply lewis, i have visited several sites including this one (varmint al, reloaders nest, graymist44, 6mmbr.com and others) most load data that I have found seems to be focused more around the hevier type bullets for competition and the lighter stuff for varmints though. Also I have found that the case capacity for the .243ai and 6x284 are about the same. With the exeption of a hot load for the .243ai would be about a medium one for the 6x284 with only about a grain of difference. Seems like to me that the 6x284 might only be faster by around 100fps and if i am able to achieve 3400fps with the 243ai it may be a better choice cause of its shorter length. guys with experience on these two cartridges please correct me if I am wrong.
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  #5  
Old 11-29-2007, 10:03 PM
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Quote:
Originally Posted by j_22250 View Post
thanks for your reply lewis, i have visited several sites including this one (varmint al, reloaders nest, graymist44, 6mmbr.com and others) most load data that I have found seems to be focused more around the hevier type bullets for competition and the lighter stuff for varmints though. Also I have found that the case capacity for the .243ai and 6x284 are about the same. With the exeption of a hot load for the .243ai would be about a medium one for the 6x284 with only about a grain of difference. Seems like to me that the 6x284 might only be faster by around 100fps and if i am able to achieve 3400fps with the 243ai it may be a better choice cause of its shorter length. guys with experience on these two cartridges please correct me if I am wrong.
Are you serious or trying to be a comedian ??? ("I have found that the case capacity for the .243ai and the 6x284 are about the same").
Let me know what direction you are headed and I can help you out either way.
UB
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  #6  
Old 12-04-2007, 11:54 AM
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sorry i havent replied sooner i just returned from a phesant hunt. NO I AM NOT TRYING TO BE A COMEDIAN. OBVIOUSLY YOU DIDN'T READ THE FIRST TWO POSTS. Anyways in my hornady reloading manual with an 87gr. bullet the max load for the 6x284 of 47 grains of RL-19. velocity of 3100fps. Max load for a .243 win is 45 grains of RL-19 at 3100fps. So I'm just guessing the ai version will hold 2-3 grains more.

P.S. don't reply like an idiot. If I already knew I wouldn't be asking, since replys have come up short this is just something that i looked up pretty quick in the hornady manual. I am looking for a reply from sombody with first hand experience.
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  #7  
Old 12-04-2007, 02:59 PM
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Quote:
Originally Posted by j_22250 View Post
"... Also I have found that the case capacity for the .243ai and 6x284 are about the same.... guys with experience on these two cartridges please correct me if I am wrong."
Not hardly.

The 6mmx284 is about 10% larger than the 243 AI.

That's nothing to sneeze at - the 6mmx284 is in a whole 'nuther class of cartridges.

You might wanna do some more research before you loose your head over this one (literally)... you obviously been given bad info.

.
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