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I think that, for most guns, the 200 grain bullet is a little too much for the case capacity of the standard '06. I think you can load the 180's to higher energy levels than you can get from the 200's out of '06 cases, but you are right at the break even point. It's a tough call to decide which is better. Your individual rifle may have a profound effect on the results. Be sure to measure velocities to be sure you are gaining an advantage.
The 200 grain bullets are ideal for the .300 magnums, however. You can get significant energy down range with very little loss in trajectory from the 200 grain bullets over the 180's in the magnums. That's what magnums are good for: pushing heavy for caliber bullets.
Now, the effect on game animals of the 200 grain may be an advantage even if you don't have as much kinetic energy, since foot/pounds is not the only measure of effectiveness. It will be an interesting experiment. Be sure to let eveyone know how it works out.
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