Underwood Ammo’s bonded rounds are unrivaled in power and precision. We utilize Speer bonded bullets which employ an exclusive Uni-Cor process where they bond the jacket to the core one molecule at a time. This essentially eliminates core-jacket separation, maximizes weight retention, and allows for unparalleled penetration and controlled yet fatal expansion.
As with all of Underwood Ammo’s rounds, we utilize flash suppressed powder so that your vision will not be compromised if it becomes necessary to use your firearm in low light.
While taking advantage of our state of the art testing equipment, this high performance ammunition is field tested using popular, real firearms that our customers are most likely to own out in the real world with all the elements you would experience. If for some reason Underwood Ammunition fails to meet performance expectations, we stand by our product 100% and will make sure the customer is satisfied with every purchase.
This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.
- Caliber: 357 Magnum
- Bullet Weight: 125 Grains
- Bullet Style: Speer Bonded Jacketed Hollow Point
- Case Type: Brass
- Muzzle Velocity: 1700 fps
- Muzzle Energy: 802 ft. lbs.
Ruger SP101 3" Barrel
- Muzzle Velocity: 1500 fps
Ruger GP100 6" Barrel
- Muzzle Velocity: 1700 fps
Posted by J Welle (Wisconsin) on 27th Dec 2014
1672fps avg from my ruger blackhawk 6" and 2350fps from my 18" M92 Rossi! Very accurate to boot!
Review Submitted on: Mon, 10/08/2012
Posted by Jason Carpenter (Springfield, KY) on 27th Dec 2014
I absolutely love it, I wished that I could chronograph how fast it is out of my S&W 686 PP with a 6" barrel! Hearing protection is definitely a must but since my magnum is ported it is loud anyway! Very, very accurate I will suggest this ammo to everyone your prices are excellent!
Review Submitted on: Tue, 08/07/2012
Another great round
Posted by JM (DFW, TX) on 27th Dec 2014
This load is HOT. The bark it gives out of my 3" GP100 turned heads. Very clean and very accurate, like all the Underwood ammo I've tried so far.
Review Submitted on: Sat, 06/16/2012
coonan 357 mag
Posted by Dennis Tifft (windsor, NY) on 27th Dec 2014
Just finished shooting these 125 gr hollow point bullits out of 3 different handguns my (1911 coonan average was 1684 fps)(gp100 with 6 inch barrel was1581 fps) and last but most punishing was out of my (m&p 340 j fram s&w was 1217 fps,was supprised with the little 1 7/8 barrel but that was all i was going to shoot out of that 13.2 oz gun very abusing next i,ll try the 38+p
Review Submitted on: Thu, 05/23/2013
really powerful stuff
Posted by Quentin Smith (cordova, TN) on 27th Dec 2014
They stopped me from shooting at the range to make sure I was shooting a 357.
Review Submitted on: Tue, 05/15/2012
This ammunition shot flawlessly...
Posted by Rufus Yazzie (Farmington, NM) on 27th Dec 2014
I had some old Underwood 357 Magnum ammo which was loaded with what appears to be Winchester bullets and the newer product. My Coonan .357 Mag had no problems with them using the standard barrel and the 6 inch barrel. One exception, the older ammunition made a huge fireball.
Review Submitted on: Thu, 08/08/2013