The 12-50 is way too much for any practical shooting. I use a 3-12x50 PMII for 1000 yard shooting regularly. It is actually my favorite S&B scope.
The 5-25 has 0.1 mil clicks not 0.01 mil.
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Practical Long-Range Rifle Shooting, Part II - Optics
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The State of Optics for Practical Long-Range Rifle Shooting [2009]
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The Hensoldt 4-16x56mm: How does it stack up? (abbreviated version)
A 175 SMK at 2650 will have about 2.4 mils drift at 1000 yards with a 10 mph cross.