Ok guys just mounted up my new Barrett M99 with a Vortex Viper PST 6-24x50 FFP. The Barrett comes with a 27 MOA sight base. Im using Nightforce Ultralight zero offset rings, so total of just the 27 MOA. I have Hornady AMAX 750 grainers and want to try for hits beyond 1000 yards. What zero do you guys think I should start with? Id like to be able to use just hold unders for closer range but this scope does have zero stop as well. Im a little new to long range stuff so any guidance would be awesome!
Rifle Scopes Barrett M99 with PST 6-24x50 help!!
- Thread starter Mall Ninja308556
- Start date
27 MOA slope might just be the sweet spot for this scope; you may be able to get a 100 yd zero which is the most simple, if not 300 is a nice round number. You'd have enough "up" elevation to get you quite a ways beyond 1000 with that setup.
If you want to shoot ELR (1500-2000+) and need more "up," with that scope you'll probably want more slope which may force you into a 500 yd zero or so. Here you'd want to figure out what the longest range you want to be able to shoot is, how much more elevation you need for it, and change slope accordingly. You may be a good candidate for our Select-A-Slope system going through final testing now which would allow you to select whatever slope you want and cheaply/easily change it if you change your mind or change scopes.
If you want to shoot ELR (1500-2000+) and need more "up," with that scope you'll probably want more slope which may force you into a 500 yd zero or so. Here you'd want to figure out what the longest range you want to be able to shoot is, how much more elevation you need for it, and change slope accordingly. You may be a good candidate for our Select-A-Slope system going through final testing now which would allow you to select whatever slope you want and cheaply/easily change it if you change your mind or change scopes.
See there is my ignorance. I thought a 100 yd zero was out of the question due to the fact that 50 BMG ballistics look more like an ICBM flight path than a bullet! LOL I zero all my non-magnified rifles and iron sights for "MPBR" and magnified at 100 yds. I found with my 7.62 NATO rifle (20" HBAR) that 500 yards required 4 Mils hold over. So you are saying to zero at 100 if possible (set that as my zero stop), then dial up all my elevation?
Yes zero at 100 if possible and dial if you have mildots.If that doesn't work go with the 300 yard zero.That is also because in most places you can always find a 300 yard range somewhere in driving distance for a quick trip to the range
Ok, im confused here. I was able to get a 100yd zero without issue. Problem is my POI is a few inches HIGHER at 200yds!? WTF? All the data I can find even on Barrett's site say that a 100yd zero should give a "-" (negative) elevation thereafter. In fact I GPS'd a target out doors at .30 MILES and only needed 1/2 MIL hold over! .30 miles is 528 yards, how can a 100yd zero correlate to almost zero hold over at 528 yards? On Barret's data I should be around 4 feet low?
86 degrees, 3000 ft., desert humidity. 6 ft. down hill to target, almost zero wind. I dont have a chrono, but I have shot 660 grain American Eagle and 750 gr. AMAX and both have very similar POI. This is a 32" barrel...
I do know you get 2 zeros, thats where "MPBR" comes from. The data I found says 50 BMG has an MPBR or 328 yds. Also, seems like 50 BMG seems to drop like a rock pretty early on in the trajectory. This is why I was very surprised to see almost zero hold over at 528 yds (with my 100 yd zero).
How could the scope me "broken"? The rifle shoots spot on at 100 yds. Returns to proper zero after windage and elevation adjustment?
I do know you get 2 zeros, thats where "MPBR" comes from. The data I found says 50 BMG has an MPBR or 328 yds. Also, seems like 50 BMG seems to drop like a rock pretty early on in the trajectory. This is why I was very surprised to see almost zero hold over at 528 yds (with my 100 yd zero).
How could the scope me "broken"? The rifle shoots spot on at 100 yds. Returns to proper zero after windage and elevation adjustment?
Last edited:
Well I guess ill just chock this one up to "who knows". Best guess is 328 yds. MPBR plus 100 yard zero equals 428 yard far zero. So the fact i was shooting 528 yards, the bullet only dropped 6-8 inches past MPBR. When I get a chance to engage farther targets and get more DOPE then I guess I will know for sure...
Similar threads
