Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Long Range Hunting & Shooting
Extreme Long Range Shooting
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Fiftydriver" data-source="post: 80721" data-attributes="member: 10"><p>SeekHer2,</p><p></p><p>First off welcome to LRH.</p><p></p><p>TO be honest, there are cartridges out there today that are the full equal to the old 50 BMG as far as extreme range ballistics.</p><p></p><p>When trying to get things done at 1000 yards, you can use any modern high performance round with a quality bullet to be honest. Even rounds like the 6mm wildcats and as you stated the 6.5mm-284 produce great results at this range as do a host of other rounds.</p><p></p><p>When you bump up to 1500 yards, the selection of usible cartridges narrows dramatically. Another issue, at these ranges, the bullet itself are extremely important in consistant performance. At 1000 yards, bullets with BCs in the .5 to .6 range perform very well. At 1500 yards this number really needs to be well over .6 and preferrably as high as you can possibly get it accurately.</p><p></p><p>This results in the bullet doing alot of the ballistic work for you instead of needed shear horsepower to drive a lower BC bullet out to these ranges. That practice simply does not work at 1500 yards.</p><p></p><p>When you push things to 2000 yards, most bullets are not effective at this range as they drop out of supersonic flight before they reach this range. In most cases, this destroys the stability and consistancy of the bullet flight as it passes from super sonic to sub sonic velocities. There are a few bullet designs that handle this better then others but most are effected to some degree by this transition.</p><p></p><p>At 2K, not only do you want high velocity but you also NEED a very high BC bullet. I personally feel it needs to be in the mid .7 range or higher for 2000 yard shooting.</p><p></p><p>At 2500 yards your getting on the fringes of any rounds performance levels. There are instances where shooters are getting results at extreme range with very small rounds such as the 308. I personally have never experienced this at these ranges and would recommend much more if a round for this type of shooting. THis range is about the limits of where I have tested rifles. I have used my 270 AM at near this range and consistancy was still very impressive but this is with a 169.5 gr ULD RBBT Wildcat Bullet(bc .740 from drop chart development) launched at near 3500 fps. </p><p></p><p>I have also tested at this range with my 338 Kahn(338-378 Imp) with the 300 gr ULD RBBT and the 300 gr SMK bullet loaded to 3100 fps as well as with my 50 BMG with the 750 gr A-Max loaded to 2750 fps. All performed well but I will say that the higher velocity of the 270 really aided in extreme range velocity levels.</p><p></p><p>I am designing a round as we speak that is designed to do exactly what you want to do. It is my 338 Allen Magnum and is based on the 408 Chey Tac case with the case design dramatically modified for increased case capacity. The standard 338-408 will get 3400 fps with the 300 gr SMK in a 35" barrel. I am looking to break the 3500 fps level with this bullet weight but more importantly, I am looking to drive the 350 gr ULD RBBT wildcat to 3300 fps. THis bullet matches most 50 cal bullets in BC and will have a 500-600 fps velocity advantage over the BMG.</p><p></p><p>I feel 3000 yard consistancy will be easily possible with this round. THe rifle will be based on a BAT 10" receiver, 40" Lilja 1.750" straight cylinder barrel and a McMillan Heavy 50 BR stock.</p><p></p><p>If I were you I would look into a big 338. Richard Graves, owner of Wildcat Bullets is Alberta so shipping these big 350 gr pills should not be a problem at all.</p><p></p><p>Just make sure you use a parent case that will handle high pressure. Many of the big bore african big game cases are designed for 40,000 psi and thats about it. This will not cut it for what you want to do. THis is why I decided to use the 408 case as it will easily handle up to 70,000 psi in pressure. </p><p></p><p>There is nothing wrong with the 378 or 416 based wildcats either. The biggest issue is bullets used. They have to do most of the work for you at these ranges so don't think velocity alone will get you where you want to go because it simply will not work.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 80721, member: 10"] SeekHer2, First off welcome to LRH. TO be honest, there are cartridges out there today that are the full equal to the old 50 BMG as far as extreme range ballistics. When trying to get things done at 1000 yards, you can use any modern high performance round with a quality bullet to be honest. Even rounds like the 6mm wildcats and as you stated the 6.5mm-284 produce great results at this range as do a host of other rounds. When you bump up to 1500 yards, the selection of usible cartridges narrows dramatically. Another issue, at these ranges, the bullet itself are extremely important in consistant performance. At 1000 yards, bullets with BCs in the .5 to .6 range perform very well. At 1500 yards this number really needs to be well over .6 and preferrably as high as you can possibly get it accurately. This results in the bullet doing alot of the ballistic work for you instead of needed shear horsepower to drive a lower BC bullet out to these ranges. That practice simply does not work at 1500 yards. When you push things to 2000 yards, most bullets are not effective at this range as they drop out of supersonic flight before they reach this range. In most cases, this destroys the stability and consistancy of the bullet flight as it passes from super sonic to sub sonic velocities. There are a few bullet designs that handle this better then others but most are effected to some degree by this transition. At 2K, not only do you want high velocity but you also NEED a very high BC bullet. I personally feel it needs to be in the mid .7 range or higher for 2000 yard shooting. At 2500 yards your getting on the fringes of any rounds performance levels. There are instances where shooters are getting results at extreme range with very small rounds such as the 308. I personally have never experienced this at these ranges and would recommend much more if a round for this type of shooting. THis range is about the limits of where I have tested rifles. I have used my 270 AM at near this range and consistancy was still very impressive but this is with a 169.5 gr ULD RBBT Wildcat Bullet(bc .740 from drop chart development) launched at near 3500 fps. I have also tested at this range with my 338 Kahn(338-378 Imp) with the 300 gr ULD RBBT and the 300 gr SMK bullet loaded to 3100 fps as well as with my 50 BMG with the 750 gr A-Max loaded to 2750 fps. All performed well but I will say that the higher velocity of the 270 really aided in extreme range velocity levels. I am designing a round as we speak that is designed to do exactly what you want to do. It is my 338 Allen Magnum and is based on the 408 Chey Tac case with the case design dramatically modified for increased case capacity. The standard 338-408 will get 3400 fps with the 300 gr SMK in a 35" barrel. I am looking to break the 3500 fps level with this bullet weight but more importantly, I am looking to drive the 350 gr ULD RBBT wildcat to 3300 fps. THis bullet matches most 50 cal bullets in BC and will have a 500-600 fps velocity advantage over the BMG. I feel 3000 yard consistancy will be easily possible with this round. THe rifle will be based on a BAT 10" receiver, 40" Lilja 1.750" straight cylinder barrel and a McMillan Heavy 50 BR stock. If I were you I would look into a big 338. Richard Graves, owner of Wildcat Bullets is Alberta so shipping these big 350 gr pills should not be a problem at all. Just make sure you use a parent case that will handle high pressure. Many of the big bore african big game cases are designed for 40,000 psi and thats about it. This will not cut it for what you want to do. THis is why I decided to use the 408 case as it will easily handle up to 70,000 psi in pressure. There is nothing wrong with the 378 or 416 based wildcats either. The biggest issue is bullets used. They have to do most of the work for you at these ranges so don't think velocity alone will get you where you want to go because it simply will not work. Good Shooting!! Kirby Allen(50) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Extreme Long Range Shooting
Top