Don't know who made it but I really like it.

VERY NICE!

Indeed. Is it still a .30-06?

Yes, 8-11 RIA barrel

375, You could really improve the look of your 03 by pulling off that black pad and installing an orange/red Silvers pad, and the Silvers is period correct. Nice find, congratulations!

If it is convenient, would you please post some pictures of the inletting.

Nicely done. Good catch.

Thanks for the pictures, I like the way the inletting was done. And even more interesting is that they turned down the barrel diameter to remove as much of the spline as they could.

The wood comes up rather high covering the lower half of the vent hole