CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assume any liability for any damage or injury resulting from use of this information.
I thought it's be fun to run some numbers in QuickLoad to get a theoretical comparison at SAAMI spec numbers and equal barrel lengths.
24" barrel, SAAMI max pressure, uncompressed loads:
110gr Barnes TTXS, 3,405fps
139gr Hornady SP, 3,085fps
180gr Berger BTHP, 2,722
110gr Barnes, 3,246fps
139gr Hornady, 2,972fps
180gr Berger, 2,595fps
So, it looks like the 7-08 runs right around 125fps behind the .280Rem at almost all bullets weights. Both cartridges will push at least a couple of those bullets slightly faster with compressed loads but neither gains enough to change the numbers to any real degree.
The 7-08 gets the bullets to speeds with a whole lot less powder though.
Both max out the 110gr with RL-17, the 7-08 using only 49.1gr, the .280 using 57.8gr. The 280 is 4% faster but uses 22% more powder. The 280 is 25.4% efficient, the 7-08 is 27.9%
With the 139s, the 7-08 does it with 46.9gr RL-17 (an excellent 30.5% efficient) while the .280 needs Ramshot Hunter and is 26.7% efficient.
With the 180s, the 7-08 likes W760 and is an very excellent 33.7% efficient, the .280 is likes RL19 as is an excellent 29.1% efficient.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.
Last edited by Brian Pfleuger; November 18, 2012 at 12:52 PM.