Not to knock the people that use them and like them but you couldn't give me an STW or ultra mag under .33 caliber. The case capasity of these cartridges is so far over bore that much of the powder burns up outside the barrel so unless you are toting a rifle with a 26" or longer barrel the STW "would be" gains are even further diminished.

Their performance gain is so little compared to the standard magnums that I see very little use for them outside the guy that already has a large rifle collection and just wants another rifle in his safe.

Compare Federals published data on the 7mm STW and the 7mm Rem mag with 160 grain accubonds.

The STW starts out at 3100 fps with 3415 pounds of energy and at 400 yards is still going 2410 fps and has 2065 pounds of energy.

The Rem mag starts out at 2950 fps with 3095 pounds of energy and at 400 yards is still going 2280 fps and has 1850 pounds of energy.

At 400 yards they have about as much energy differance as a hyper velocity 36 grain 22lr round. Think an elk will notice that? I don't.

And sight the two in to hit the line of sight at 250 yards and there is only a 1.6" advantage to the STW.

IMO the very small advantage that the STW has does not warrant the added muzzle blast, noise, recoil, throat erosion, lack of available ammunition, and cost of the STW.

You would be much better off with any of the "standard" magnums or the WSM's in 7mm or 300.