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Gualbo® Steel

GUALBO® STEEL is a Borra-Proiettile (Slug) 12 & 20 gauge with an expanding steel slug, created besides the classic Borra-Proiettile Gualandi® 32 gr. in lead, in order to increase our range of products for ungulate shooting, using a non-toxic material.
It’s perfect to comply with the new trends without giving up the quality of a Borra-Proiettile Gualandi®.

The fully in steel under-gauged slug has been created in order to expand immediately at the moment of impact, thanks to the special precut shape;

the central upper pin guarantees stability and precision, both in trajectory motion and at the moment of impact against the ungulate, facilitating the quick opening of the front petals in order to maximize the impact with the animal and achieve a cavity and hydrodynamic shock above the average.

Furthermore, to maximize the final damage, the front petals have been projected in order to come off the main body of the slug, once it penetrates the tissues for about 10 cm.

For the plastic body of the Gualbo® Steel, a special variant of the Gualbo® slug’s container has been developed: as for the version in lead, the plastic body is provided with lateral tongues that hold the steel slug and come off the central body immediately after the come out of the barrels, letting the slug together with the fletching wad go free in trajectory motion.
This container, besides guaranteeing the equilibrium and precision of the Gualbo® Steel in trajectory motion, has the important function to protect the barrels from the scraping of the steel slug, guaranteeing their integrity and allowing the use of barrels with any narrowing, thanks to the self-dimensioning during the run inside the rifle.
The wad is provided with the classic Gualandi® shock absorber that allows the self-regulation of the Gualbo® Steel during the phase of cartridge’s closure and absorbs the stroke during the shot, to the advantage of the hunter.

Gualbo Steel - G12 STEEL

BORRA-PROIETTILE g 31.5 mm 45.8





Gualbo Steel - G20 STEEL







Gauge 12
Weight: 31.5 grams
Total height: 45.8 mm

Ballistic results with 1.90 grams of powder (Tecna N)

Average pressure:
704 bar
Average speed V0
(at the exit of the barrel’s mouth):

474 meters per second

Ballistic results with 2,15 grams of powder (Tecna N) - High-performance cartridge

Average pressure: 885 bar
Average speed V0
(at the exit of the barrel’s mouth):

513 meters per second


As for the Borra-Proiettile® in lead, use a flat rimming tool. Before rimming the cartridge, press the slug into the case to let the powder settle in the obturator; in fact the elastic structure of the wad allows the Gualbo® Steel to come back in the perfect conditions for the rimming.
The height of the finished cartridge can vary from 62,5 mm up to 64 mm according to the volume of the used powder; anyway you have always to check that the upper tip of the slug doesn’t stick out from the rimming of the cartridge.

Gualbo Steel - Shots