From a performance stand point the slightly larger case capacity of the taylor would be pretty much offset by the larger dia case and the shorter barrel. I would call max performance about equal. If you perfer the shorter action the go with it.

With great interest I've been reading post here about both cartridges.

Angle shots on moving elk in dark timber with the occasional clear cut or open senneca is the purpose of this rifle. Shots taken when seconds are a luxury.

I prefer short(er) actions that the WSM offers, yet dont want to count out the Taylor. I'm looking at a 21" barrel
and a stock that goes no more than 13" of pull. Barrel thickness is a toss up.

What advantages do both rounds offer from handloading to shooting?

Looking at Midway the WSM cases and 338 cases are the same price. The 338 will be easier to take to 375. But, I have taken 280 brass to 416 and own a 375 wildcat I designed using the 280 case. Just use tapered expanders and you can use the factory dies. Just lower the expander. As to die cost. I've had full custom wildcat two die sets made by Hornady for $95. While they might not be benchrest quality they work just fine for a hunting rifle. Too me it stills boils down to which action do you want?? everything else is equal.

Well...the performance should be about the same, but you would have to think about the availability and cost of the following:

1. WSM dies
2. WSM cases

As you may know, .338WM cases are cheap and readily available, while you may be able to use a .338WM die with a .375 expander (I am not certain about this, however).

Thanks for the replys!

Gives me a little more to think about.