Originally Posted by
Ridge Runner
fritz, your loads mean nothing, cause they don't make sense, first your comparing different bullet form factors, speer bullets are not nearly as streamlined as hornadys, so your crippleing the 270 outta the gate with a speer bullet.
next, your claiming the 7/08 as to be only 100 fps behind the 270 even though not only does the 270 have 20% more case capacity, but its rated to a higher pressure by saami specs, those may be the results of your loads but definately not a true comparison of the 2 cartridges.I've chronied both cartridges, did the comparisons with real world data and the 270 will come out on top every time at 500 yards, if they are both loaded with 500 yard shooting in mind.
RR
edited to add: the speer BT is an ok bullet, however, the max MV for the 270 is not 3000 fps, its over 3100, there are no less than 4 powders listed on the hodgdons website that achieve over 3100 fps with max loads. load the 270 up to its potential and it drops 5+" less than the 08 at 500 yards, like I said nothing to worry about for normal hunting but the difference is there if ya ever need it.
You are right RR. I used Hornady to compare because Speer doesnt list a 140 for the 7mm, but does list a 145gr. boattail, so lets compare that with the .277 130gr. Speer boattail.
The 7mm Speer 145gr. has a b.c. of .502 and a muzzle velocity of 2933 loaded with 51grs. of RL19. It drops 41" at 500 yards and has 9.13ftlbs of energy per grain of bullet weight, which comes out to 1323.85 ftlbs of energy at 500 yards.
Now the 270 using a 130gr Speer boatail has a b.c. of .449 and a muzzle velocity of 3117 loaded with 64grs. of H1000. It drops 37.1 at 500 yards and has 9.6ftlbs of energy per grain of bullet weight, which comes out to 1248 ftlbs of energy at 500 yards.
This is a close comparison with like bullets. The 270 is less than 4" flatter at 500 yards but does not have the energy of the 7-08. Like you said and I said, not enough to make any difference in a hunting gun, where most hunting shots are under 300 yards. 4" isnt much, especially at 500 yards, this is less than a beer can and with a hunting rifle and in a hunting situation the average hunter cant even hit a beer can at 500 yards, so to me a 270 has no advantage what so ever over a 7-08 out to 500 yards, matter of fact it doesnt even have the energy that the 7-08 has out at that distance.