Ken Posted February 5, 2017 Report Share Posted February 5, 2017 Any ideas on how much flatter, farther, and the max distance of the 7mm-08 would be if we simply just picked two readily available factory ammunitions with the closest bullet size, say 150 grain fired from the same barrel length such as a carbine length, maybe 18"? Looking to buy a complete assembly the would pop into the two breakdown pins on my DPMS Oracle 308. Don't even know if it is possible. Or maybe build the upper slowly as I can afford it.....if the 7mm-08 would be a better round to reach out farther???? Thanks. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted February 5, 2017 Report Share Posted February 5, 2017 I don't recall off the top of my head but I want to say the big difference between the two is the transonic range, e.g., the distance where the projectile moves from supersonic to subsonic. IIRC for the weight you suggest, .308 Win transitions to subsonic somewhere between 800-900 yards, while the 7mm-08 is still cooking supersonic at around 1100 yards. The transition from super- to subsonic imparts an instability on the projectile which affects accuracy. That being said, a 6.5mm/.264 projectile stomps azz on both the .30 and 7mm/.284 calibers for retaining velocity and accuracy downrange. Now, all that being said, if you are looking at an 18" barrel just stick with .308 Win IMO. Plenty of ammo choices at a cheaper price, with less wear on your barrel, and plenty of "in-stock" components. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 5, 2017 Report Share Posted February 5, 2017 If you are picking or comparing readily available factory ammo , you really can't compare . Two different Cartridges , no two Bullets of same weight comparisons available , so how can you compare the two . I load a 139 gr. SST for a Hunting friend of mine & I got his , 7mm-08 ,700 Rem. Bolt gun to do almost one hole groups @ 100yards & he has no problem stoning white tailed deer at any normal range. The 308 with a 150 gr. SST ,that I also I load for, does the same thing. If you are comparing down range velocities & Energy ft#'s , pick any Caliber , they are all different ,chances are , you will not find comparable Bullet weights in different calibers , so pick one that works for you , as said above , there are better long range calibers you can pop on a 308AR Lower . Quote Link to comment Share on other sites More sharing options...
ARTrooper Posted February 5, 2017 Report Share Posted February 5, 2017 4 hours ago, Ken said: factory ammunitions those are the key words. I love thinner and longer bullets with high BCs, but if you are going factory ammo, nothing really compares to what is out there for .308, far more to choose from and a lot easier to find. usually cheaper also. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted February 5, 2017 Report Share Posted February 5, 2017 OP said 150gr. 7mm-08 150gr: https://www.midwayusa.com/product/853027/hornady-precision-hunter-ammunition-7mm-08-remington-150-grain-eld-x-box-of-20 .308 Win 150gr: https://www.midwayusa.com/product/490933/hornady-superformance-sst-ammunition-308-winchester-150-grain-sst-box-of-20 Close enough for a comparison IMO. Still, 16" bbl, I'd stick with .308. Quote Link to comment Share on other sites More sharing options...
Ken Posted February 5, 2017 Author Report Share Posted February 5, 2017 Ok. So lets bring the barrel length up to 22" or 24". What are the "better" as one member stated that could be added to the 308AR lower to make a flat shooter out to 800-1,000 yards? I want to just pop on an upper that can reach that distance without 60+ inches of drop. Remember I'm new to this, please be gentle..... and I do want the 308 to be able to use for the cost savings. BTW....I added a Cobratec carbon fiber handguard today....and why is my picture upside down when in the upload preview screen. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted February 5, 2017 Report Share Posted February 5, 2017 Very nice brother. I like the handguard grip, I have put them on most of my rifles. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 6, 2017 Report Share Posted February 6, 2017 5 hours ago, planeflyer21 said: OP said 150gr. 7mm-08 150gr: https://www.midwayusa.com/product/853027/hornady-precision-hunter-ammunition-7mm-08-remington-150-grain-eld-x-box-of-20 .308 Win 150gr: https://www.midwayusa.com/product/490933/hornady-superformance-sst-ammunition-308-winchester-150-grain-sst-box-of-20 Close enough for a comparison IMO. Still, 16" bbl, I'd stick with .308. When I looked it up I didn't see a 150 gr. in the Ballistic tables , They have Metallic & standard tables , I looked in Metallic , the 150 gr. load shows up in Standard Ballistic tables , my bad . Still two different calibers & I can see in the Ballistic tables , @ 500 yards , the 7mm08 shows a better FT LB. & Velocity , but not by much & about about three inch more drop @ the 500 yards for the 308 , big deal , there is , to me , not enough to pick the 7mm08 to the 308 . Don't get me wrong , I thinks its a good caliber . Quote Link to comment Share on other sites More sharing options...
ARTrooper Posted February 6, 2017 Report Share Posted February 6, 2017 7mm-08 is slightly superior over .308. but if you are going factory ammunition, .308 is far more common and has far more options to choose from for bullets. 15 hours ago, Ken said: What are the "better" as one member stated that could be added to the 308AR lower to make a flat shooter out to 800-1,000 yards? I want to just pop on an upper that can reach that distance without 60+ inches of drop. getting less than 60 in drop at 800-1000 yards is wishful thinking I believe. Using hornady's ballistics chart, which I often use as a quick reference, 7mm-08 at 500 yards is dropping 39.6 in to 56.6 in depending which hornady bullet. Their .308 rounds drop 40.7 in to 63.2 in at 500 yards. They used a 24" barrel for their charts also. http://www.hornady.com/assets/files/ballistics/2017-Standard-Ballistics.pdf 270 Win will shoot a little flatter (low 30s for drop at 500 yards) but the cartridge might be to long for an AR-10 without some mods, would have to ask someone else about that. And along the same lines, there is 270 WSM. Plus I am sure their are other cartridges out there that might shoot flatter, but will they fit in a standard AR-10, beats me. And still doubtful that at 800-1000 yards it will have less than 60 in in drop. As the distance increases, the bullet will slow down and the drop will increase at a faster rate. Now I haven't shot past 600 yards since the military, so please correct me if I am wrong Quote Link to comment Share on other sites More sharing options...
Dane Armory Posted February 6, 2017 Report Share Posted February 6, 2017 270wsm yeah I got one. 125gr ballistic tipped projectiles have a wicked BC ! 150 grain a big hitting hunting round. 270win 130gr round has taken more deer than just about everything else !!! Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 6, 2017 Report Share Posted February 6, 2017 3 hours ago, Dane Armory said: 270win 130gr round has taken more deer than just about everything else ! Actually the venerable 30-30 is first & 30'06 is second as far as most used cartridges on game animals . maybe the 270 is third Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted February 6, 2017 Report Share Posted February 6, 2017 1 hour ago, survivalshop said: Actually the venerable 30-30 is first & 30'06 is second as far as most used cartridges on game animals . maybe the 270 is third 4th, since you said "game" instead of "big game", .22 Long Rifle should be at the front. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 7, 2017 Report Share Posted February 7, 2017 3 hours ago, planeflyer21 said: 4th, since you said "game" instead of "big game", .22 Long Rifle should be at the front. Not my statistics , I read it some where , but ya , could be more then one category & it could have changed through the years . Quote Link to comment Share on other sites More sharing options...
Magwa Posted February 7, 2017 Report Share Posted February 7, 2017 270 130 grain spitzer boat tail i have killed over 25 elk with that round and Jack O'Connor killed everything in the US with it , if you want flat you will have to spend more ,much more you will have to get into the Magnum Lowers or a good single shot rifle and shoot something like a 7mm STW, or a 30,338,, or 6mm284,or 6.5x284 with the bullets we have today all those calibers are very capable of 1000 yards and 6 inch or less groups it all depends on how far you want to go but any 1000 yard gun will demand the very best reloading... Quote Link to comment Share on other sites More sharing options...
sketch Posted February 7, 2017 Report Share Posted February 7, 2017 My bro has or had the 7mm stw. Bolt action. That thing will ring your bell! Quote Link to comment Share on other sites More sharing options...
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