Four calculators, because the answer is usually arithmetic
Each one does the number, shows the working, and states plainly what it does not model. None of them ship with preloaded ballistic data — you enter what is on your boxes, because a coefficient we cannot source is a coefficient we will not publish.
Wind & drop comparator
Put two or three match loads side by side and see drift and drop at 600 and 1000 yards. Full G1/G7 point-mass solver with a numerically solved zero.
Twist rate stability
Miller stability factor with velocity and air density corrections, plus the slowest twist that would still stabilise the bullet you want to shoot.
Scope ring height
Minimum ring height from objective bell and tube diameter, with the clearance gap and height over bore drawn to scale.
Cost per round
Box prices into cost per round and a season budget, with practice and match ammunition costed separately.