The most common question in .30-30 hunting is simple:

“Should I use 150 grain or 170 grain bullets?”

The answer is not about tradition. It is about what you want the bullet to do when it hits.

The Reality

Both 150 and 170 grain bullets work in the .30-30. But they do not behave the same.

  • 150 grain bullets tend to expand faster
  • 170 grain bullets tend to penetrate deeper

This difference becomes more important as velocity changes with distance.

What Actually Matters

The .30-30 operates in a moderate velocity range. That means bullet performance is highly dependent on design and weight.

See: TN-30CAL-05 — Impact Velocity Windows

When to Choose 150 Grain

  • Broadside deer
  • Woods hunting distances
  • Faster energy transfer desired

Best matched with expansion-focused designs like:

→ 150 Grain Razorback (controlled expansion)

When to Choose 170 Grain

  • Angled shots
  • Heavier animals
  • Penetration is the priority

Best matched with penetration-focused designs like:

→ 170 Grain Rhino (deep, straight-line performance)

The Mistake Most Hunters Make

They choose based on habit, not outcome.

The correct question is:

“What do I want the bullet to do on impact?”

Final Answer

There is no single “best” grain weight.

There is only the correct choice for the result you want.

See: 150 vs 170 Grain — Field Performance Study