Posted: 10/23/2014 1:48:17 PM EDT
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On this PA scope:
https://www.primaryarms.com/Primary_Arms_4X_Compact_Prism_Scope_p/pac4x.htm it says the reticle is good for "223/5.56, 5.45x39, .308" how can a bullet drop compensator be accurate for "223/5.56, 5.45x39, .308" ? Using the ACSS reticle, that's what it says. Does the 168gr 308 have the same drop as the 55 gr 223 ? I just dont see how it can work for diferent calibers with different trajectories. one person in GD says use it like mil-dots. if that's the case, it's good for any caliber, and shouldnt be numbered for yardage in my opinion, since it isnt really a bdc at that point. I have an acog ta01 on a 10.5", and at 400 measured yards, the 400 mark on the reticle, impact is just a tad low, so that works for me. educate me |
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With a 200yd zero and similar barrel lengths, 55gr 5.56 and 150gr .308 will be pretty close within 500yd, plenty close enough for a fixed 4x.
If you start throwing higher BC bullets in the mix, it will obviously change it up, but you're not buying a fixed 4x for shooting groups at 500+yd. 
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Buy a quality scope and learn your drops. Kenton Industries makes custom BDC elevation knobs for many popular scopes based on your specs or set to standard factory accuracy loads, like Federal Gold Medal Match. Actual muzzle velocity is critical when ordering or you'll be not anything going this route.
You need elevation above sea level as well. I use 1000 feet because of where I live. Most BDC's from the factory are set at sea level which makes no sense to me. It is impossible for any scope maker to produce a generic "one size fits all" BDC. Nightforce's SV, MV and HV BDC options are better than buying a generic model. They will get you very close when using there data imputs to make your selection. It will never be dead on for anyone, let alone everyone. It will be very close. |