Description
The Grizzly 45-70 +P 525gr Bonebreaker FP load, item GC45/70+P10, is a 20 round box of 45-70 Government +P ammunition from Grizzly Cartridge Company, loaded with a 525 grain Bonebreaker flat point bullet rated at 1610 fps with 3078 ft-lbs of muzzle energy. Grizzly recommends it for hunting bison, bears and other dangerous animals.
Grizzly 45-70 +P 525gr Bonebreaker FP Overview
A 525 grain bullet is about as heavy as factory 45-70 ammunition gets, and Grizzly drives this Bonebreaker flat point to a rated 1610 fps with 3078 foot-pounds of energy. Loads like this turn a lever-action 45-70 into a serious tool for bison, moose and the largest bears, and they are favored by guides who carry a short, handy rifle as backup in brown bear country. The extremely heavy, non-expanding bullet is built for maximum straight-line penetration through heavy bone and muscle.
Bullet Design
Bonebreaker is Grizzly Cartridge’s name for its hard, non-expanding flat point bullet. A wide, flat meplat crushes and cuts tissue instead of simply pushing it aside, and because the bullet does not expand, it keeps driving in a straight line for deep penetration through muscle and bone. That is why loads like this are a common choice for the largest North American game and dangerous animals.
Intended Use
Grizzly recommends this load for hunting bison, bears and other dangerous animals. It is designed for close to moderate range, where its weight and penetration matter most. It is not a target load and is far more than needed for deer. Confirm that your rifle is rated for +P 45-70 ammunition before use.
Firearm Compatibility
This ammunition is loaded to +P pressure and is made only for strong, modern rifles chambered in 45-70 Government, such as the Marlin 1895, Henry and Rossi lever actions, Browning and Winchester 1886 reproductions, and Ruger No. 1 single shots. Never fire +P 45-70 loads in a Trapdoor Springfield, original antique rifles, replica rolling blocks or any rifle not rated for high-pressure 45-70 ammunition.
Grizzly Cartridge Company
Grizzly Cartridge Company is an American ammunition maker known for heavy, hard-hitting loads for hunters, outdoorsmen and handgunners who carry in bear country, along with cowboy action, defense and safari ammunition. Its loads are made in the USA, and many are built to run at the upper end of what each cartridge allows, so always match the load to your firearm.
Recoil and Shootability
Heavy +P 45-70 loads produce substantial recoil, especially from lightweight lever-action rifles. A good recoil pad, correct stock fit and a firm shoulder mount make a big difference, and many shooters limit bench sessions with loads this powerful.
Practice and Testing
Fire at least a box through your own rifle before you rely on this load for hunting or protection. Confirm reliable feeding and extraction, and check where it prints at the distances you expect to shoot, since heavy or fast loads often hit to a different point than light practice ammunition.
Storage and Care
Store ammunition in a cool, dry place in its original box, away from solvents and lubricants that can contaminate primers. Inspect rounds for dents, loose bullets or corrosion before loading.
Specifications
- Brand: Grizzly Cartridge Company
- Item number: GC45/70+P10
- Caliber: 45-70 Government +P
- Bullet weight: 525 grain
- Bullet type: Bonebreaker flat point
- Rated velocity: 1610 fps
- Muzzle energy: 3078 ft-lbs
- Recommended for: Hunting bison, bears and other dangerous animals
- Count: 20 rounds per box
- UPC: 815152011282
- Made in the USA
Before You Buy
Federal law requires buyers of rifle ammunition to be at least 18 years old when buying from a licensed dealer. Some states and cities restrict ammunition purchases, require background checks or limit shipping, so check your local rules before you order.
Who It Is For
The Grizzly 45-70 +P 525gr Bonebreaker FP is a great fit for guides and hunters who carry a 45-70 in brown bear country, bison and moose hunters using a lever-action rifle, and anyone who wants maximum penetration from a modern 45-70.
Buy the Grizzly 45-70 +P 525gr Bonebreaker FP at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Grizzly 45-70 +P 525gr Bonebreaker FP online and we will ship it to you where state and local law allow, or browse our full selection of ammunition for more rifle loads. For factory details, visit Grizzly Cartridge.
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