Josh,

For my choice of the straight-tube scopes I like the 1.25-4 Swarovski or Schmidt & Bender (older model).

Swarovski 1.25-4 PH

These are 30mm tube with great image, field of view, and light gathering. You can't go wrong with one of these.

Also, I think expecting 10,000 rounds from a .300 Win. Mag. is wildly optimistic. Your barrel will burn out much quicker. 2,500 is probably a stretch. This info I pass along from my shooting buddy who is on his third stainless steel barrel on his Dakota in .300 Win. Mag.

Curl