The Latitude and Longitude are (courtesy of Bob Krohn):

From the greater Los Angeles area: Take the 10 Freeway east to Interstate 15 north.

From Orange County: Take the 91 Freeway east to Interstate 15 north.

From San Bernardino: Take the 215N Freeway to Interstate 15 south.

Exit at Sierra Avenue.
Go north (toward the mountains), 1.5 miles.

You will see a sign for West End Gun Club.

Turn right onto the dirt road.
Continue on the road for 1 mile to the entrance to the range.

Google Map - Turnoff

Google Map - Range

Click Here: for a Yahoo Map or Click Here for Driving Directions.

Here are some maps and photographs of the local area that should be helpful: