Description
Berger built these 40 grain .204 diameter bullets for the varmint hunter who refuses to compromise between accuracy and terminal performance. They carry a boat tail design and a tangent ogive, which is the combination that makes them forgiving to tune and easy to shoot well across a range of loads. The tangent profile is less picky about seating depth than secant designs, so you can get them grouping without endless load development.
What Sets the 40 gr BT Varmint Apart
The heart of these bullets is the J4 Precision Jacket, the same jacket renowned among competitive target shooters and custom bullet makers. The nose is drawn thin on purpose, which promotes rapid expansion the moment it hits a prairie dog, ground squirrel, or coyote. Because they're made to match-grade standards, the core and weight consistency is tight enough that you don't need to sort by weight out of the box. That translates to the kind of shot-to-shot repeatability that keeps groups small at distance.
Specs That Matter for Your .204 Build
These run a G1 ballistic coefficient of 0.227 and a G7 of 0.116, with a sectional density of 0.137 and an overall length right around 0.680 inches. Berger lists a minimum twist of 1:12 inches or faster to stabilize them properly, which lines up nicely with most .204 Ruger and 20 Caliber wildcat barrels. The boat tail gives them a slight edge in the wind over a flat base, so they hold up well when you stretch things out to the longer varmint ranges.
Loading and Field Use
The .204 is a flat-shooting, high-velocity round that thrives on light, fast bullets, and this 40 grain projectile is one of the most popular pills for it. Handloaders consistently report tight groups and devastating results on small game and predators. Keep in mind these are components only, so you'll be supplying your own brass, powder, and primers to build the load that your rifle likes best.
Key Specifications
- Manufacturer: Berger Bullets
- Manufacturer Part Number: 20304
- UPC: 679459203043
- Caliber: .20 Caliber
- Bullet Diameter: 0.204 in
- Bullet Weight: 40 Grain
- Bullet Style: Boat Tail Varmint (BT)
- Ogive Style: Tangent
- Jacket: J4 Varmint Jacket
- Core Material: Lead
- G1 Ballistic Coefficient: 0.227
- G7 Ballistic Coefficient: 0.116
- Sectional Density: 0.137
- Overall Length: 0.680 in
- Recommended Twist Rate: 1:12 in or faster
- Quantity: 100 per box
What’s Included
- 100 Berger 20 Cal .204 40 gr BT Varmint bullets (projectiles only, not loaded ammunition)
Frequently Asked Questions
What twist rate do I need to stabilize the Berger 40 gr BT Varmint?
Berger recommends a 1:12 inch twist or faster to properly stabilize this 40 grain bullet. That falls right in line with most factory .204 Ruger barrels and plenty of 20 caliber wildcats. If your barrel is slower than 1:12, you may run into stability issues, so check your twist before loading.
Are these loaded cartridges or component bullets?
These are component bullets only, meaning you get 100 projectiles and nothing else. You'll supply your own brass, powder, and primers to assemble your handloads. They're designed for reloaders building precision varmint loads for the .204 Ruger and similar 20 caliber cartridges.
What makes the J4 Precision Jacket worth it on the BT Varmint?
The J4 jacket is the same one favored by competitive target shooters and custom bullet makers for its extremely tight tolerances. On this varmint bullet, the nose is drawn thin to promote rapid expansion on impact. That blend of consistency and explosive terminal performance is what separates these from budget varmint bullets.
Do I need to sort these bullets by weight for best accuracy?
No. Because Berger produces these to match-grade standards with a tight core-forming process, weight consistency is already dialed in from the box. Most handloaders load them straight away without any additional sorting and still see excellent groups.





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