JBM's signature artifact, rebuilt: one matrix that shows how your come-up moves when the day gets hot, cold, or high. Pick a bullet, set your zero, print the card.
Read this before you rely on any number here. Predictions use the standard G1/G7 drag models and the data you enter — they are estimates, not measurements, and they are never load advice. Confirm with live fire at distance. For anything you load yourself, work only from current published manuals (Hodgdon, Sierra, Hornady, Lyman), start low, and work up. TruingLog publishes no load recipes and suggests no charge weights.