Owner of Buffalo Bore  Tim Sundles on Heavy 10mm Ammunition:

The Buffalo Bore Heavy 10mm ammo is the result of many years of customers’ requests that we produce several such loads for the 10mm.

These are the absolute heaviest bullets that can be fired through 10mm pistols. With its flat nose it will penetrate straight and very deeply into muscle and bone. Straight-line penetration into living tissue will exceed three feet.

These loads bring out the full potential of the 10mm but operate at standard pressures and as such, are safe to use in any standard 10mm pistol.
We are using flash-suppressed powders so your vision will not be materially affected should you be required to drop the hammer in low light.

If you are firing this 10mm ammo from an autoloader and experience high extreme spreads in velocity, it is not the ammo. Here is why and how to remedy the situation.

Full power 10mm Buffalo  Bore has  always generated enough recoil and pressure to require a pretty stiff recoil spring in your handgun – this of course depends on several variables such as your slide weight, etc.

When the cartridge fires, it generates enough pressure/recoil to prematurely open your breech face in some guns. When this happens, the opening breech face has an effect on the burn rate of the powder. This can result in some fairly high extreme spreads in velocity. If you are experiencing extreme velocity spreads of more than 50 fps, simply install a stiffer recoil spring. For example, I have an original Colt Delta Elite. This gun with the factory spring runs extreme spreads of about 35fps with both of these 10mm loads. I am happy with 35 fps, so I leave the Delta Elite as is. I also have a custom-built Para Ordinance with a Nowlin barrel. It runs extreme spreads of about 70 fps with its original recoil spring. When I install a spring that is 4 lbs stiffer, the extreme spread drops to about 35 fps. 10mm Buffalo Bore Ammunition.

Please note below, my personal velocities taken from real pistols:

• 1. 1140 fps – Glock model 20 4.6 inch barrel
• 2. 1175 fps – Colt Delta Elite 5-inch barrel
• 3. 1201 fps – Para Ordinance 1911 with Nowlin 5-inch barrel