Description
The Swift A-Frame in .375 caliber is one of those bullets that gets talked about around campfires for a reason. Built for dangerous game where a bullet has to do its job the first time, this 300 grain projectile combines a bonded front lead core with a solid copper wall in the middle of the jacket. That wall keeps the front half expanding while the rear shank stays intact to drive deep. It measures the standard .375 diameter with a semi-spitzer soft point profile and a wraparound base jacket that guards against deformation and keeps weight where you want it.
What Makes the .375 A-Frame Tick
The magic here is in the design. The bonded front core and progressively tapered pure copper jacket give you controlled expansion that opens up to roughly twice the original caliber. Swift rates this bullet to start expanding around 1,650 fps on the low end and to hold together past 3,000 fps on the high end, so it works across a wide velocity window. Weight retention runs 95 percent or better, which is exactly what you want when you need penetration through heavy bone and muscle. The soft nose is also shaped to shrug off recoil while rounds sit in the magazine, so your points stay true under the pounding a big bore dishes out.
Loading the Swift A-Frame 300 Grain
This .375 bullet is a natural fit for the .375 H&H Magnum, and it also plays well in the .375 Ruger, .375 RUM, .375 Weatherby and other cartridges in the family. Handloaders regularly report tight groups when they take the time to work up a load, with some settling in under an inch. The published ballistic coefficient sits at .325 with a sectional density of .305, giving it plenty of downrange punch for its intended range. As always, start low and work up with a trusted manual.
If you hunt buffalo, big bears, or anything else that can turn the tables on you, the A-Frame earns its keep. It is a proven performer that folks have leaned on for African and North American big game for decades.
Key Specifications
- Manufacturer: Swift Bullet Company
- Caliber: .375
- Bullet Diameter: .375"
- Bullet Weight: 300 grain
- Bullet Style: A-Frame Bonded Semi-Spitzer Soft Point
- Jacket Material: Pure copper
- Ballistic Coefficient: 0.325
- Sectional Density: 0.305
- Expansion Threshold: 1,650 fps low end, holds past 3,000 fps
- Weight Retention: 95% or better
- Intended Use: Dangerous and large game hunting
- Count: 50 per box
- Manufacturer Part Number: 373005
- UPC: 713351373005
What’s Included
- 50 Swift A-Frame .375 caliber 300 grain rifle bullets
Frequently Asked Questions
What cartridges is the Swift A-Frame .375 300 grain bullet good for?
This .375 diameter bullet works across a big lineup of cartridges, with the .375 H&H Magnum being the most popular home for it. It also loads well in the .375 Ruger, .375 RUM, .375 Weatherby and similar rounds. Reloading data exists for a wide range of .375 caliber cases, so most big bore hunters will find a recipe that fits their rifle.
How much does the .375 A-Frame expand and retain?
Swift rates the A-Frame for controlled expansion up to about twice its original diameter with 95 percent or better weight retention. The bonded front core and internal copper wall are what make that possible, letting the nose mushroom while the rear shank drives deep. That combination is why it has a reputation for reliable performance on heavy game.
Is the Swift A-Frame accurate enough for hunting?
Plenty of handloaders report sub-inch groups after working up a proper load, so accuracy is generally not a concern once you find what your rifle likes. The ballistic coefficient of .325 is modest compared to sleeker match bullets, but at typical dangerous game distances the difference is minimal. For its intended job, it delivers the accuracy you need.
Are these loaded rounds or bullets for reloading?
These are component bullets meant for handloading, not finished ammunition. You supply your own brass, powder and primers to build your loads. Always start low and work up using a trusted reloading manual and watch for pressure signs.





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