Father Knows Best
Member
I have a new Hensoldt Fero Z 24 scope mounted in an HK claw mount on my PTR-91 (HK91 clone). I'll be heading to the range Saturday to zero it. Anyone here have any experience in zeroing this set-up? Want to check my figures and give some helpful advice?
The info I've found is that 7.62x51 NATO milsurp ammo should have a muzzle velocity around 2,500 fps in my rifle (18" barrel). The bullet is a 150 gr spitzer with a BC of approximately 0.37. If I measured correctly, the scope centerline is approx 3.5" inches above the bore centerline. Using those figures, it looks like a 200 yard zero would be a good one for me.
With a 200 yard zero, the scope should also be zeroed or extremely close to it (less than .20" off) at 50 yards. POI will be +/- 2.0" from POA all the way from 20 yards to 230 yards. POI will be -9.8" at 300 yards, which is the longest range I shoot at (I don't have a longer range available, and if I did, I wouldn't use this rifle/ammo combination).
My ammo supply for this rifle right now is a mix of Argentine, Belgian and Korean milsurp. Any reason to think any of this ammo will significant vary from the specs listed above (MV 2,500 fps, 150 gr bullet, BC .37)?
Any reason I should zero at 100 or 300 instead of 200?
The info I've found is that 7.62x51 NATO milsurp ammo should have a muzzle velocity around 2,500 fps in my rifle (18" barrel). The bullet is a 150 gr spitzer with a BC of approximately 0.37. If I measured correctly, the scope centerline is approx 3.5" inches above the bore centerline. Using those figures, it looks like a 200 yard zero would be a good one for me.
With a 200 yard zero, the scope should also be zeroed or extremely close to it (less than .20" off) at 50 yards. POI will be +/- 2.0" from POA all the way from 20 yards to 230 yards. POI will be -9.8" at 300 yards, which is the longest range I shoot at (I don't have a longer range available, and if I did, I wouldn't use this rifle/ammo combination).
My ammo supply for this rifle right now is a mix of Argentine, Belgian and Korean milsurp. Any reason to think any of this ammo will significant vary from the specs listed above (MV 2,500 fps, 150 gr bullet, BC .37)?
Any reason I should zero at 100 or 300 instead of 200?