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Reading the ladder you have the 76.5 and 77 touching and 79.5,80, and 80.5 with 1" vertical. The general theory on the Audette ladder...

For what it's worth if your app wants DA (Density Altitude) and you don't have a Kestral or other instrument that calculates it, take...

All I can say is, trust the target. When I shot Military rifle comp (scoped) there were no rangefinders, scopes with target reticles...

Somewhere areound 2016 VV changed the formulations on the 100 series to be more temperature stable. I have a 2015 N135 that doesn't...

Different apps use different models and some will include spin and Coriolis force and spin drift. Also the solving methods differ...

Lead sled = No Bueno They are known to cause problems with the scope and rifle. Most knowledgeable shooters advise against using them. YMMV

The case on the right is showing an extractor(?) mark at 11 o'clock so you are probably above the 60KSI point. But my take is that your...

I believe that N135 was actually designed around the M80 308 round (147gn). Probably for the FAL. I use it in 223 with 53/52 gn...

The drop to 400 yds in most cartridge is not a strong function of BC. The usual recommendation is to true using velocity out to about...

Several years ago Mark Gordon of Short Action Customs did a very in-depth study of bullet jam/jump and the results are on the Precision...