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need help with caliber choice

 
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  #8  
Old 06-06-2006, 11:11 AM
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Re: need help with caliber choice

IF he already has the barrel would a standard 243 Win lower the MV enough with the 115's?
Does Richard make any heavyweight 6mm's that would work well in a 1-7 twist that would allow him to jump into the 6-284 class?
FWIW a 243 w/a 115 is enough to get you to 1500 yds on PD's.
My 115 DTAC had good expansion, but, have not hit enough dogs at that range to see what typical would be.
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  #9  
Old 06-06-2006, 03:16 PM
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Re: need help with caliber choice

XP,

Yes the 243 would help alot.

Richard has plans for some 120 gr class 6mm bullets but again is waiting on dies.

Velocity is not all that important with a bullet like this at these ranges, its good velocity and high BC that will get you on target.

The trick is to not overstress the bullet. This can be done by to much twist or to much velocity.

A 6mm Dasher would be another good choice as would a standard 6-250 or AI.

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #10  
Old 06-06-2006, 08:46 PM
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Join Date: Aug 2005
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Re: need help with caliber choice

ok first let me say that i just got back from my second prarie dog hunt and i have got addicted to shooting at them at long range (and sometimes killing them)it seems that i very rarely shoot at a prarie dog under the farthest distance i have killed one before i took about 900 rounds of 223,22-250and 220 swift and ended up shooting about 40 rnds of 223 while my 22-243 was colling off managed to kill a dog at 655yds with the 223 though my long range gun now is a 22-243 thats shoots great and i finally killed a pd at 1045 yds with it which was the first time i broke a 1000 before but the gun is wearing out quick i read on here the other day that i would be lucky to get a 1000rnds out of it and have decided that i would just build 3 long range guns to take on my next trip i have 2 of them done and i have this barrel the barrel is not a 3-groove and i did probably jump the gun when i got this barrel but i didnt have to wait on it and damnit sometimes i get in to big of a hurry i know none of you guys do but thats just the way i am


i have really considered the 6mm-250 ai and have a reamer available to me and probably 1000 rnds of new 22-250 brass but was concerned about it not having enough steam to get there and was wondering what advantage it would have over a 243or 6mm remington ?

what kind of speed can i get out of the 6mm-250 imp.with a 105,107gr class bullet?

also i already have a 6.5x284 that i just finished so i dont really think i need 6mmx284

anyway i really appreciate this site and all of the helpful people on it thanks for your help,Brian
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  #11  
Old 06-06-2006, 08:57 PM
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Re: need help with caliber choice

[ QUOTE ]
what kind of speed can i get out of the 6mm-250 imp.with a 105,107gr class bullet?


[/ QUOTE ]

I'm getting right @ 3000 fps w/the 105 gr Berger in a standard 6-250. I don't feel that this is much if any over pressure either. Primers are still round, no extractor mark, very little if any primer flow and effortless extraction. I'm happy!!!!

I guess I better put in a shameless plug for my smith as well:

THANKS KIRBY [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]!!!!!!!!!!!
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  #12  
Old 06-07-2006, 08:26 AM
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Re: need help with caliber choice

Brian,

The main advantage, barrel life. Sounds like you want to be able to shoot a decent amount of rounds in a weekend and the 6-250 will offer much more then a 243 or 6mm will with much lower barrel heat.

If you compare a 243 or 6mm Rem with a 6-250 you will see around a 200 fps advantage in muzzle velocity for the larger round.

At 1000 yards its about a 120 fps advantage between the two. At 1250 yards the velocity advantage is about 90 fps and at 1500 yards, the difference in velocity has shrunk to only a bit over 50 fps.

Energy difference at 1500 yards is about 25 ft/lbs of energy is all.

Yes the larger cases will shoot flatter but bullet drop is consistant and easy to figure. Wind drift will also be less for the larger rounds but not by as much as many would think. At 1500 yards the larger round will have about 16" less windage then the smaller 6-250 which is really hardly worth mentioning at this range.

Now if you go with a 6-250 AI, you will get a solid 100 fps over the standard 6-250. In some cases 150 fps. Yes a 6-250 AI will pretty much match a standard 243 Win with all bullet weights.

Again I would rather put up with a bit more drop and a very small amount more windage for the greatly increased barrel life and lower recoil. Espeically for a high volume shooter.

If your going for performance only with no concern of barrel life then add on the powder but there are costs to this performance. The 6-250 and 6-250 AI will suprise you are what they will do at long range.

Oh by the way Bill, thanks for the plug!! [img]/ubbthreads/images/graemlins/grin.gif[/img]

Kirby Allen(50)
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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