You'll hear the word "DOPE" constantly in this sport. It sounds like slang, and in a way it is. It's one of the most important concepts for actually hitting things.
The definition
DOPE stands for "Data On Previous Engagements." In plain language, it's the record of how much adjustment your specific rifle and ammunition need to hit targets at various distances.
Think of it as your rifle's personal cheat sheet. It answers the question: "At 600 yards, how much do I need to dial up?" Your DOPE tells you: "At 600 yards, dial 4.2 mils up."
Why it's necessary
Every rifle-and-ammo combination is a little different. Your bullet leaves the barrel at a certain speed, has a certain shape (which affects how it flies), and drops a certain amount at each distance. Two rifles in the same caliber might need slightly different adjustments. Your DOPE captures your setup's specific behavior.
There are two ways to get your DOPE:
1. Calculated DOPE (where you start): You use a ballistic calculator (app or Kestrel) and input your data — your cartridge, bullet weight, muzzle velocity, your scope height, local conditions — and it predicts your DOPE for every distance. This gives you a great starting point.
2. True DOPE (confirmed by shooting): You actually shoot at known distances and record what adjustment really put you on target. This "trues" your data — confirming or correcting the calculated predictions. Real-world DOPE is the gold standard because it accounts for the quirks of your specific setup that calculations might miss.
In practice, you start with calculated DOPE, then confirm and refine it by actually shooting at distance. Over time you build a reliable, trued DOPE chart you can trust.
What your DOPE looks like
It's usually a simple chart or card, something like:
| Distance | Elevation (dial up) |
|---|---|
| 100 yds | 0 (your zero) |
| 200 yds | 0.6 mils |
| 300 yds | 1.4 mils |
| 400 yds | 2.3 mils |
| 500 yds | 3.3 mils |
| 600 yds | 4.4 mils |
| ...etc | ...etc |
You keep this handy — taped to your rifle, in your data book, or in your phone — and reference it during shooting. "Target's at 500? My DOPE says 3.3 mils up. Dial it. Shoot."
We'll cover how to actually build your DOPE chart in the setup section. For now, just understand the concept: DOPE is your rifle's distance-to-adjustment cheat sheet, and you can't hit distant targets reliably without it.