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The Underwood 916 InterLock is built for hunters who want real terminal performance from their .45-70. This +P load runs at 2350 fps from the muzzle and packs 3678 ft-lbs of energy, making it a serious option for modern lever guns and single shots designed to handle hotter loads.
The Hornady InterLock core uses a mechanical ring that locks the bullet's lead core to the jacket during expansion, so you get reliable mushrooming without losing the back half of the projectile. That means better energy transfer into the animal and less wasted energy. The 300 grain weight keeps velocity up while maintaining the ballistic performance you expect from a .45-70.
Every cartridge comes loaded in nickel-plated brass, which feeds smoother through action or magazine and resists corrosion far better than standard brass. The flash-suppressed powder is a real advantage if you ever hunt in low light or at dawn and dusk when muzzle flash matters. It also helps preserve your night vision if you're doing any evening work.
This is not general-purpose .45-70 ammunition. The +P designation means it's loaded to higher pressures than standard loads, so it only belongs in modern firearms in good mechanical condition. Think modern Marlin levers, Ruger singles, or similar strong-action rifles. Underwood uses consistent powder charges, tight tolerance assembly, and quality control to keep shot-to-shot performance reliable, which matters when you're on a hunt and every round counts.
No, this is +P ammunition designed only for modern, strong-action firearms in good condition. Older rifles like Trapdoor Springfields and similar vintage actions aren't built for the higher pressures these rounds generate. Underwood loads this ammunition specifically for modern lever guns, single shots, and other contemporary designs. If you own a vintage .45-70, look for standard-pressure loads instead.
The 300 grain InterLock is built for medium to large game hunting. It works well on deer, elk, bear, and similar-sized animals. The InterLock bullet design keeps the core locked to the jacket during expansion, delivering reliable terminal performance at typical hunting ranges. The +P velocity and energy make it more effective than standard .45-70 loads without requiring excessive barrel length.
Yes, the nickel-plated brass cases come with standard Boxer primers, so they're reloadable. Just make sure your reloading equipment can handle the +P pressure specifications if you're working up new loads. Underwood's nickel plating also resists corrosion during storage, which keeps your brass in better condition between reloading sessions.
Flash-suppressed powder burns in a way that produces less muzzle flash at the end of the barrel, which helps preserve your night vision in low-light hunting situations. It also reduces the visible signature, which can be useful in certain hunting scenarios. This is one of the details that sets Underwood's loads apart from basic factory ammunition.
| Caliber/Gauge | .45-70 Government |
|---|---|
| Case Material | Nickel-Plated Brass |
| Cost per Round | 2.40 |
| Grains | 300 gr |
| Manufacturer | |
| Manufacturer Part Number | 916 |
| Units per Box | 20 |
| UPC | 816874023980 |
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