I use ballistic tips whenever I can. Very high quality. But for Elk, I'd use a partition. And for Muley too, maybe. Nosler has divided their Ballistic Tip line of bullets into "Hunting" and "Varmint". FWIW, this is from their site.
**************************
... from 22 through .416 (35 cal. 225 grain shown here), Nosler® Partition® ...(edited)
1. Fully tapered jacket ruptures instantly at the thin jacket mouth, yet the gradual thickening along the bullet's axis controls expansion and curls the jacket uniformly outward, at high or low velocities.
2. Nosler's special lead alloy dual core construction provides superior mushrooming characteristics at virtually all impact velocities.
3. Nosler's integral partition supports the expanded mushroom and retains the rear lead alloy core.
4. Special crimp locks in the rear core section, adding strength to resist deformation under the pressure of heavy magnums.
5. Enclosed rear core retains more than half the original bullet weight for deep penetration.
Nosler 30 cal. 180 grain Ballistic Tip® Hunting
1. The Ballistic Tip® Hunting bullet's polycarbonate tip resists deformation ... (edited)
2. Fully tapered jacket and special lead alloy core allows controlled expansion and optimum weight retention at all practical velocity levels.
3. Heavy jacket base acts as a platform for large diameter mushroom.
4. Ballistically engineered Solid Base® boat tail configuration combines with the streamlined polycarbonate tip for extreme long range performance.
Nosler 6mm 70 grain Ballistic Tip® Varmint
1. Nestled in the jacket mouth is the streamlined polycarbonate tip, color-coded by caliber.
2. The Ballistic Tip® Varmint's ultra thin jacket mouth assures violent expansion at either end of the velocity scale.
3. The uniform, gradual thickening of the jacket wall at the bullet's mid-section is designed to keep the Ballistic Tip® Varmint together until impact at any velocity.
4. The heavy jacket base prevents bullet deformation during firing.
5. Nosler's unique Solid Base® boat tail design, combined with the polycarbonate tip, dramatically increases long range ballistic efficiency.
********************
It looks like primarily a different jacket design.
You could probably tell more if the .30 cal vs 6 mm bullets were scaled better. I just did a cut'n'paste. They are on different web pages and Nosler probably didn't plan on a side-by-side comparison of the images.