NugginFutz Wrote:The discrepancy with the Amax bullets (and apparently with several other poly-tipped bullets, such as the Nosler) was due to a phenomena known as aero-heating. Friction at high velocities caused the plastic tips to melt, resulting in a decaying BC as the drag increased with the melting tips.
The ELD tips eliminated that issue. Further, where the BC's were previously calculated, Hornady now publishes their BC's resulting from direct measurements using their doppler radar system.
In other words, newbie, the data on the new ELD boxes is quite accurate.
If one watches their sales pitch video for their new A-TIP they talk about this bullet supposed to greatly reduce the BC variations found in standard production bullets. Which I believe would mean the likes of ELD, etc have noted BC variations +/- advertised value.
If I recall correctly reading various places the AMAX tip softening with some deformation didn't happen until at least 600 yds and with velocities higher than Grendel at that distance. Some long range guys claiming they didn't notice anything at 1,000 yds. But none the less that is a dead horse.
I dug up my values and 10 ft chrono data agrees right in there with the ELD velocity stated on box, at least with the rounds I ran chrono on. According to the trajectory simulator ran just now, with that Hornady stated G1 BC and my altitude etc correction, MOA drop at 500 yds should be 9.65. My actual drop was 15 MOA. I don't have doppler radar to track down range. The best I can do is state the data I personally collected.
The only thing left I could re-verify on my end to rule out would be 100 yd scope box test.