PDRENNER,
Am I correct, I should be able to get better groups with my hunting loads?
Maybe, maybe not.
I'm not trying to be evasive but we really don't have anything to go on here even though you might think you've given us a ton of information. Is the .338 Gibbs you posted the same as those cartridges developed by Rocky Gibbs or is this one something different?
Not all bullets respond the same way to every velocity node. Increasing velocity or decreasing velocity can affect the size and shape of the group. Nothing is automatically assumed. As a disclaimer though, the Nosler Partition has been one of the most consistently accurate bullets in several cartridges I've shot.
I would think that if you are satisfied with the 200 grain loads that you should consider using that combination for elk also. It should yield about 3100 ft/lbs of energy at the muzzle with 1,100 ft/lbs at 500 yards. Shot placement is always imperative to these discussions.
If you feel strongly about adding another 25 grains of bullet weight to the equation then maybe you need to work on another node. Or switch primers? Or seating depth? Or some of the other dozen variables in this process.
I've used the 225 gr. Barnes TTSX for a couple of intermediate volume cartridges with very good results. At 2,700 fps you should have nearly 3,700 ft/lbs of energy at the muzzle. This will result in 1,800 ft/lbs at 500 yards.
I would suggest clearing the board and starting over with good basic loads and work your way up. Remember though, if this is a Rocky Gibbs style cartridge, be very careful with pressure excursions. The 'Improved' shoulder on this type of cartridge does not show signs of increased pressure in stages. It's usually normal until you get a very sticky case extraction.
Enjoy the process!
