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Chosing the right .243/6mm

 
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  #8  
Old 12-02-2010, 01:00 PM
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Location: South Central PA
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Re: Chosing the right .243/6mm

I am a big fan of the 6BR it is extreamly accurate, i also have a 243 Super Rockchucker (aka 243-06) and a 243 winchester. My second fav would be the Rockchucker although barrel life is not the best in it but its a screamer
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  #9  
Old 12-02-2010, 01:26 PM
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Re: Chosing the right .243/6mm

Thanks for all the info guys. This site is great. As you can see by my post count i'm new. I would LIKE to go with a short action. Not 100% on it yet. I wasnt too interested in the gibbs or the 6-06. For some reason i seem to be more interested in the short action. I have plenty of big bore long actions. I have no experience with .243 cal. I'm sure the br would be great, i just have the need for speed. I know i sacrifice a lot for it but I just like it.

I am leaning towards the 6mm remington but someone said the 243 ai shoots greaat. I like the 243 due to all the GOOD brass available. I prefer not to have to fire form cases because i plan to shoot this gun a lot in the summer months so barrel life is an issue. If either of those cases (243ai or 6mm ai) make 200-250fps difference with the 40 degree shoulder... i'll do it.

From some of my research it looks like with the smaller bullets i would actually LOSE velocity with bigger cases such as 6-284, 6-06 and gibbs. Would I have to worry about that with improving the 243 or 6mm? Also what twist do you guys think? I know its better to spin too fast than too slow. Should i go with 10 or 12? Also, for you guys helping me with velocity numbers I plan on a 26" barrel.
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  #10  
Old 12-02-2010, 02:20 PM
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Re: Chosing the right .243/6mm

Quote:
Originally Posted by wvcountryboy View Post
Thanks for all the info guys. This site is great. As you can see by my post count i'm new. I would LIKE to go with a short action. Not 100% on it yet. I wasnt too interested in the gibbs or the 6-06. For some reason i seem to be more interested in the short action. I have plenty of big bore long actions. I have no experience with .243 cal. I'm sure the br would be great, i just have the need for speed. I know i sacrifice a lot for it but I just like it.

I am leaning towards the 6mm remington but someone said the 243 ai shoots greaat. I like the 243 due to all the GOOD brass available. I prefer not to have to fire form cases because i plan to shoot this gun a lot in the summer months so barrel life is an issue. If either of those cases (243ai or 6mm ai) make 200-250fps difference with the 40 degree shoulder... i'll do it.

From some of my research it looks like with the smaller bullets i would actually LOSE velocity with bigger cases such as 6-284, 6-06 and gibbs. Would I have to worry about that with improving the 243 or 6mm? Also what twist do you guys think? I know its better to spin too fast than too slow. Should i go with 10 or 12? Also, for you guys helping me with velocity numbers I plan on a 26" barrel.

your not kidding about this being a great site you wont find one better
anyway enough of that if i were you i would just stick with the 243 winchester. The AI does not (in my opinion) give you enough extra with the lighter bullets to make it worth having to fire form them and the brass is much easier to find than the 6mm stuff. You can get 4K FPS with the 55g Nosler bullet with a bc of .267 and sight it dead on at 200 and be less than an inch high at 100 and about 4-5" low at 300 so pretty much hold dead on inside of 300 and your optimal game weight is still 101 lbs at 300 but dies off very quickly after that. I would however not use a ballistic tip on deer going that fast cause you will just cause a flesh wound however for paper or groundhogs and such it will do great. As far as twist the 12 would work great for the 55g bullets but if you ever decide to go heavier you might have trouble. I would go with a 10 just in case one day down the road you want to shoot a 80 or 90g bullet for deer
Hope some of this helps
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  #11  
Old 12-02-2010, 02:36 PM
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Re: Chosing the right .243/6mm

Quote:
Originally Posted by wvcountryboy View Post
Thanks for all the info guys. This site is great. As you can see by my post count i'm new. I would LIKE to go with a short action. Not 100% on it yet. I wasnt too interested in the gibbs or the 6-06. For some reason i seem to be more interested in the short action. I have plenty of big bore long actions. I have no experience with .243 cal. I'm sure the br would be great, i just have the need for speed. I know i sacrifice a lot for it but I just like it.

I am leaning towards the 6mm remington but someone said the 243 ai shoots greaat. I like the 243 due to all the GOOD brass available. I prefer not to have to fire form cases because i plan to shoot this gun a lot in the summer months so barrel life is an issue. If either of those cases (243ai or 6mm ai) make 200-250fps difference with the 40 degree shoulder... i'll do it.

From some of my research it looks like with the smaller bullets i would actually LOSE velocity with bigger cases such as 6-284, 6-06 and gibbs. Would I have to worry about that with improving the 243 or 6mm? Also what twist do you guys think? I know its better to spin too fast than too slow. Should i go with 10 or 12? Also, for you guys helping me with velocity numbers I plan on a 26" barrel.
food for thought:

not all short action rifles are created the same. They will vary a .150" in length. The Savage will handle a 6mm Remington just fine unlike a Remington 700 using 90 grain bullets seated out to the rifeling. I also seem to remember that the Winchester is longer than the Remington as well.

Most guys I know that shoot the .243 go thru cases on a regular basis do to neck splits (Ackleys seem to be worse). I'm using 6mm remington cases that are close to 15 years old. The 6/250 goes thru a case about every six firings, but I think if I anealed them every third or fourth firing they might last a little longer. The next problem you get is that when you form the .243AI (or really any Ackley case) the overall length actually shrinks about .03" in the neck length. With the .243 already being too short for the caliber, this creates a problem. Alot of guys I know are now using 6mm, or .257 cases to form .243 Ackley brass (most chambers have the neck cut a little long anyway, so you can take full advantage of the max neck length. (.06" will do wonders)

If you just gotta go fast, then at least look at the 6 Vias (70 grain bullet at 4000+fps). The 6/250AI will drive a 105 grain Amax bullet at close to 3100 fps, and still do 1/4" groups at 100 yards (I use H1000 powder with a 1:8 twist barrel) The twist rate needed will parallel the actual bullets you plan on using. A 1:10 will easilly do a 90 grain bullet, but still work well with the 70 grain bullets (I like the Sierra 80 grain Blitz). But if you planning on using the VLD's or low drag bullets you need to step up the twist rate. My 6BR uses a 1:14 twist, and it barely handles the 80 grain Blitz (a 1:12 would do wonders). The 6mm's I've owned had 1:9 twist, but would not handle VLD's very well; yet shot 85 grain bullets like they going outta style.
If I were to build a rifle around a 6mm something, I think it'd be a Savage mod. 12 single shot action. Use the laminated wood stock (the older style with the flat forend). Buy a good used one and order in a Sharpshooter barrel in whatever you decide on (you may have to furnish the reamer if it's a oddball). For me it'd be another 6/250AI, but with a 6mm neck length in a 1:10 twist
gary

Last edited by Trickymissfit; 12-02-2010 at 02:47 PM.
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  #12  
Old 12-02-2010, 05:12 PM
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Location: Elizabeth, WV
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Re: Chosing the right .243/6mm

I think i will go with the 10 twist. Gary, what is the 6 vias? I did a quick search and couldnt find anything. The 6mm is sounding better and better due to the neck length. According to the sierra manual, the improved 6mm is getting nearly 400 fps more. I find that hard to believe. It looks like a lot of you have the 243 ai but not the 6mm ai. I appologize for all my questions. I just find it wonderful that I have found a place that i can ask questions and get answers.
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  #13  
Old 12-02-2010, 05:15 PM
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Join Date: Feb 2006
Location: az
Posts: 2,157
Re: Chosing the right .243/6mm

i have a .243 with a 12 twist hart barrel. it shoots great. i mainly shoot 87 and 88 grainers. routine in the .2s ; at 100. roninflag
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  #14  
Old 12-03-2010, 09:41 AM
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Join Date: Jul 2007
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Re: Chosing the right .243/6mm

Quote:
Originally Posted by Trickymissfit View Post
that would be known as a 6mm HLS.
gary

why not 6mm AI ?
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