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.277 130 vld
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<blockquote data-quote="bab029" data-source="post: 941408" data-attributes="member: 61624"><p>Howdy all, </p><p></p><p>I am looking at a new rifle some time soon, and (surprisingly or not) am agonizing over the caliber. I have set the parameters of a sporter to medium weight rifle suitable for southeastern deer inside 600 yards 99% of the time. I do know I want a standard caliber of some sort, avoiding the flash and drama of the magnums and hopefully enjoying longer life of both my barrels and the ligature of my shoulder. I also want to avoid obnoxiously rare calibers so that I can run to a store and be relatively assured of coming home with a box of something to blow off every now and then. I do and will reload for the rifle, and that is where our fun begins. I am coming to be in the "light and fast' school, especially for hunting our frail whitetails. Having always been a .30 caliber slut I was immediately drawn to the 30-06. Timeless. Ubiquitous. Many choices in projectiles, and 110 years of load data. Gentle on the barrels, while still being a rifle for anything on this continent. It seemed like a true front runner, especially since a Remington 700 CDL SF in this caliber has been gathering dust at the local gun shop for several months now, and I was promised a good deal if I come asking for it. </p><p></p><p>So like any good scientist, I go to the data for answers. I have always been of the opinion that the 270 winchester is the great round that was forgotten by the progress of the last couple decades. It seems like only a few years ago you couldn't find anything in .277 with a BC higher than a refrigerator, so naturally I completely overlooked this cartridge in favor of joining the clamoring over the 6.5s and 7 millimeter rounds so popular. However I now think the 130 berger VLD (and some of the other options available) may have changed the game a bit. </p><p></p><p>I have an Excel based ballistic calculator that I have found to be pretty accurate in past work, so I scoured the interwebz for a little load data for three of my contenders: the .270 winchester, the 30-06, and the 7mm-08. I looked at three pills in .277 (130, 140, 150), the 140 in 7mm, and the 155 and 168 in 30-06. I don't have personally verified data for velocities, so approximations were extrapolated from what I could find in a brief google search (including this site).</p><p></p><p><a href="http://www.shareimages.com/image.php?77538-rJuWoZOZm5yllw-0_600.jpg" target="_blank"><img src="http://www.shareimages.com/images/thumbs/0/0/3/77538-rJuWoZOZm5yllw-0_600.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p> As you can see from the graph above, it would seem that these are all fairly close performers. max PBR is 300-325 for each round. However my main interest is in performance at 5-600 yards, if not more. So I looked closer, and there is a significant difference between the three rounds after the 400 yard mark. </p><p></p><p><a href="http://www.shareimages.com/image.php?77539-rJuWoZOZm5yllw-300_600.jpg" target="_blank"><img src="http://www.shareimages.com/images/thumbs/0/0/3/77539-rJuWoZOZm5yllw-300_600.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>I chose one pill from each round for the above graph. As you can see, the 277 130 remains flatter after 400 despite having a lighter weight, and a lower bc than both the .308 155 and 7mm 140. It is worth noting that the energies at 600 were all still over 1000 for sure, in the 1200 range for .277 and 7mm; 1400s for the .308. There was about a 10" difference in drop between the 130 and the 155, and a 6.5" difference between the 130 and both 140 offerings (7mm and .277) </p><p></p><p>So the question becomes, within the parameters i set out above (non-magnum, common cartridge for skinny, southeastern deer inside 600 yards), is there any round that can top the flat trajectory of the .270 without sacrificing KE on target? I did not run numbers on any 6.5mm rounds (.257 bob to 600 yards?) since I was under the impression that most were overbore and therefore a little hard on barrel life. </p><p></p><p>Backing up a little, are the velocities I used for the calculations reasonable? Can you think of any reason for the excellent performance of the 130 in this simulation?</p><p></p><p>Whew. Sorry for the long one there. Look forward to hearing what you guys have to say on it. We may be splitting hairs and agonizing over minutiae, but without such exercises, this site and many like it would see far less traffic. (LOL!)</p></blockquote><p></p>
[QUOTE="bab029, post: 941408, member: 61624"] Howdy all, I am looking at a new rifle some time soon, and (surprisingly or not) am agonizing over the caliber. I have set the parameters of a sporter to medium weight rifle suitable for southeastern deer inside 600 yards 99% of the time. I do know I want a standard caliber of some sort, avoiding the flash and drama of the magnums and hopefully enjoying longer life of both my barrels and the ligature of my shoulder. I also want to avoid obnoxiously rare calibers so that I can run to a store and be relatively assured of coming home with a box of something to blow off every now and then. I do and will reload for the rifle, and that is where our fun begins. I am coming to be in the "light and fast' school, especially for hunting our frail whitetails. Having always been a .30 caliber slut I was immediately drawn to the 30-06. Timeless. Ubiquitous. Many choices in projectiles, and 110 years of load data. Gentle on the barrels, while still being a rifle for anything on this continent. It seemed like a true front runner, especially since a Remington 700 CDL SF in this caliber has been gathering dust at the local gun shop for several months now, and I was promised a good deal if I come asking for it. So like any good scientist, I go to the data for answers. I have always been of the opinion that the 270 winchester is the great round that was forgotten by the progress of the last couple decades. It seems like only a few years ago you couldn't find anything in .277 with a BC higher than a refrigerator, so naturally I completely overlooked this cartridge in favor of joining the clamoring over the 6.5s and 7 millimeter rounds so popular. However I now think the 130 berger VLD (and some of the other options available) may have changed the game a bit. I have an Excel based ballistic calculator that I have found to be pretty accurate in past work, so I scoured the interwebz for a little load data for three of my contenders: the .270 winchester, the 30-06, and the 7mm-08. I looked at three pills in .277 (130, 140, 150), the 140 in 7mm, and the 155 and 168 in 30-06. I don't have personally verified data for velocities, so approximations were extrapolated from what I could find in a brief google search (including this site). [URL=http://www.shareimages.com/image.php?77538-rJuWoZOZm5yllw-0_600.jpg][IMG]http://www.shareimages.com/images/thumbs/0/0/3/77538-rJuWoZOZm5yllw-0_600.jpg[/IMG][/URL] As you can see from the graph above, it would seem that these are all fairly close performers. max PBR is 300-325 for each round. However my main interest is in performance at 5-600 yards, if not more. So I looked closer, and there is a significant difference between the three rounds after the 400 yard mark. [URL=http://www.shareimages.com/image.php?77539-rJuWoZOZm5yllw-300_600.jpg][IMG]http://www.shareimages.com/images/thumbs/0/0/3/77539-rJuWoZOZm5yllw-300_600.jpg[/IMG][/URL] I chose one pill from each round for the above graph. As you can see, the 277 130 remains flatter after 400 despite having a lighter weight, and a lower bc than both the .308 155 and 7mm 140. It is worth noting that the energies at 600 were all still over 1000 for sure, in the 1200 range for .277 and 7mm; 1400s for the .308. There was about a 10" difference in drop between the 130 and the 155, and a 6.5" difference between the 130 and both 140 offerings (7mm and .277) So the question becomes, within the parameters i set out above (non-magnum, common cartridge for skinny, southeastern deer inside 600 yards), is there any round that can top the flat trajectory of the .270 without sacrificing KE on target? I did not run numbers on any 6.5mm rounds (.257 bob to 600 yards?) since I was under the impression that most were overbore and therefore a little hard on barrel life. Backing up a little, are the velocities I used for the calculations reasonable? Can you think of any reason for the excellent performance of the 130 in this simulation? Whew. Sorry for the long one there. Look forward to hearing what you guys have to say on it. We may be splitting hairs and agonizing over minutiae, but without such exercises, this site and many like it would see far less traffic. (LOL!) [/QUOTE]
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