Hit harder, penetrate deeper, and keep your night vision intact with Buffalo Bore Ammunition Heavy “Strictly Business” .357 SIG 125gr Full Metal Jacket Flat Nose (FMJ-FN)—a full-power, low-flash load built for shooters who want serious barrier performance from the fast, flat-shooting .357 SIG platform. Whether you’re training for real-world scenarios, stocking duty-ready ammunition, or simply want a deep-penetrating option that can outperform typical round-nose FMJ on hard targets, the 25B20 delivers the signature Buffalo Bore approach: no watered-down velocities, flash-suppressed powder, and real-world chronograph data from actual pistols.
Packaged 20 rounds per box / 12 boxes per case (240 rounds per case), this is Item 25B20 with UPC 651815025025. Buffalo Bore+2Sportsman's Warehouse+2
Heavy, full-power .357 SIG—built the way the caliber was meant to run
Buffalo Bore created their Heavy Low Flash .357 SIG line specifically because shooters asked for true full-power .357 SIG ammunition rather than reduced-performance “practice level” loads. MidwayUSA+1
This 125gr FMJ flat nose loading is designed to take advantage of what .357 SIG does best: high velocity, excellent feed reliability, and strong penetration—especially when expansion isn’t the goal and intermediate barriers are part of the problem set.
125gr FMJ Flat Nose: more than a range bullet
Unlike round-nose FMJ, a flat nose (FN) profile presents a broader meplat at impact, which can improve straight-line disruption and help the bullet “bite” into certain materials more effectively. Buffalo Bore positions this load as a deep-penetrating choice intended to defeat cover and barriers that can stop or clog hollow points. Buffalo Bore+1
Buffalo Bore explicitly notes this bullet is intended to smash through typical stick-frame walls and car doors, and is designed for deep penetration. Buffalo Bore+1
Low-flash powder: a real advantage in low light
One of the most practical features of this load is its flash-suppressed powder, which Buffalo Bore and major retailers call out as a tactical advantage—helping reduce the blinding muzzle flash that can ruin vision in dim conditions. Sportsman's Warehouse+1
If you run night shoots, low-light training, or keep a defensive pistol staged for home use, low flash is a meaningful performance feature—not a marketing extra.
Published performance: 1,425 fps class velocity (real pistols, not test barrels)
Buffalo Bore lists this 25B heavy FMJ-FN load at approximately 1,425 fps with a 125gr bullet, and also emphasizes that their velocities are taken from real-world firearms rather than long test barrels. Buffalo Bore+1
Retail listings commonly echo the spec at 1425 fps and around 564 ft-lbs of muzzle energy. AmmoJoy+1
A smart “barrier” companion load
Buffalo Bore’s own suggested use case is instructive: they describe loading expanding ammo up front and keeping these FMJ-FN rounds deeper in the magazine for situations involving cover or barrier penetration. Buffalo Bore
That concept—pairing rapid-expansion rounds with a deeper-penetrating option—is exactly why shooters choose a flat-nose FMJ in a high-velocity cartridge like .357 SIG.
Box and case format for stocking, training, and consistency
20 rounds per box OpticsPlanet
12 boxes per case (240 rounds total) AmmoJoy+1
This packaging is ideal if you want to function-test, confirm point of impact, and then maintain a consistent supply for duty rotation or training blocks.
SEO-friendly product identifiers and specs
Important safety note (use-case clarity)
Because this is a deep-penetrating FMJ load intended for barrier performance, it can over-penetrate in many scenarios. Always choose ammunition appropriate for your environment, follow all laws and range rules, and function-test in your specific firearm.
If you want a full-power, low-flash .357 SIG round with a flat-nose FMJ designed for serious penetration and barrier capability, Buffalo Bore Heavy Strictly Business 25B20 (651815025025) is built to do exactly that—no compromises, no watered-down performance.
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