The 22 creedmoor thread

[ID_Matt]

I think your #s are off. My 22CM w 77s is a 7mph gun out to 700 yards

What BC and speed are you using? In my AB app I had to plug in 3800 FPS to get to a 0.7 wind call for 7MPH at 700 yards.

At 3100 FPS I show the 77 as a 5 mph gun and the 80 eldm as a 6/7 mph.

 

[Lawnboi]

How much consideration are you giving to the BC between the 77TMKs vs the 80ELDMs? Running them through AB the 77s are a 4mph gun for my load (1.5Mil in a 90* 10mph @ 600M and 59% WEZ on a deer) vs the 80s being a 5 almost 6mph gun (1Mil in a 90* 10mph @600M and 87% WEZ on a deer).

I want to shoot the 77s so my 223 and 22CM are shooting the same thing, but the wind advantage / hit probability of the 80s seems too big of an advantage? Does that make sense? And if it does why the cult following for the 77? Seems that hitting what you're aiming at trumps whatever incremental terminal performance might be gained.

The 80eldx and 77tmk seem to have very very similar behavior when they hit a deer at ~3k fps, which quite honestly is an amount of damage that I consider nearly too much.

The wind advantage is notable. I find when you hit a point where 1mph of wind equals .1mil (ie 400yds for your 4mph 77tmk) things become more difficult from that point on. For me there would only be upside if your rifle shoots the 80eldx.

 

[JPW13]

I think your #s are off. My 22CM w 77s is a 7mph gun out to 700 yards

really!? How fast are they going? I’m using Applied Ballistics for those calcs, but I’m sure I could be doing something wrong. Just not sure what. I’m using my chrono data over many shots and ABs bullet library and custom drag curve.

 

[Lawnboi]

Your gun number is dependent on density altitude. So that’s where some difference might be.

When assessing for it turn off AJ and spin drift.