I run IMR4831 with Sierra 140 SP Gameking and see pressure signs at 3170 from 23" Obermeyer 5R barrel. Boots run his 7mm tight at .274 but says the 5R design helps with pressure. Best accuracy I get is 57 grains of IMR 4831 @ 3080 into one ragged hole. I am not trying to beat or replicate the 7mm Rem mag. I am just trying to squeeze as much juice as safely as I can in a standard long action and bolt face. I hate belted magnums and midgets magnums and have had many and sent them away. Some say a regular .270 can push 140 up to 3000 fps and .280 rem up to 3100 FPS too when loaded to .270 pressures. From "my experiences" i find that accuracy drops when you push 140 grain .270 to more than 2900 and the .280 Rem to more than 3000. Most Accuracy nodes i find for the .270 win with 140 and a .280 140 rem is around 2800. In "my" .280 Ackley I can push to 3100 piece of cake with great accuracy of the low side of pubished data and have room to spare. If I squeeze it more I can push to 3180 fine but accuracy drops. So for me, 200 extra fps from standard .280 Rem with a more accurate load, more cartridges in the chamber, brass life and cool factor is what cuts the .280 Ackley for me. Not that a deer or even myself will see the difference 200 fps can make, but its there to brag, lmfao. Dont need a magnum to kill deer and the .270 is gay (fire suit on)
