DZ, very good points however i enjoy the safety of a weatherby action with 9 locking lugs as well as the low 52 degree bolt angle, it allows me to use scopes lower to the barrel and still get the bolt open. Its just a preference i guess, I dont want to pull my 30-378 apart and just rebarrel it. The weatherby action is simply stronger for wildcatting from what i have seen and read specs wise.
As for making the 280-378, the high BC of a .280 round, with the ability to push it over 4000fps, would make it the flattest shooting, lowest drifting round ever put into a gun under 12lbs. with a drop of only 140" vs the drop of 335" using a .338 L , the 338 L has 4700ft lb of energy @ the muzzle, the 280-378 will have 6100 ft lbs. @1000yrds the 280-378 will be doing 2 times the speed of sound and have 1900 ft lbs of energy, the .338L does a little over Half the speed and 1200ft lbs of energy at the same distance. 280-378 will drift 40" w/10mph cross, the .338 drifts 77". All in all the comparison between the 2 is not even close. The .338L is a smaller case, with 20gr less capacity.
As for making the 280-378, the high BC of a .280 round, with the ability to push it over 4000fps, would make it the flattest shooting, lowest drifting round ever put into a gun under 12lbs. with a drop of only 140" vs the drop of 335" using a .338 L , the 338 L has 4700ft lb of energy @ the muzzle, the 280-378 will have 6100 ft lbs. @1000yrds the 280-378 will be doing 2 times the speed of sound and have 1900 ft lbs of energy, the .338L does a little over Half the speed and 1200ft lbs of energy at the same distance. 280-378 will drift 40" w/10mph cross, the .338 drifts 77". All in all the comparison between the 2 is not even close. The .338L is a smaller case, with 20gr less capacity.