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29.08.2017 | Hints from the experts

Continuation regarding RS12 and RS20 for shotgun cartridges

Dear Reload Swiss RS Family,

A little while ago, we published some information on shotgun cartridges. Since then, the person who got in touch with us has continued to work on the subject and has very kindly sent us some additional information. As you’d expect, we’re more than happy to share the findings with other reloaders.

Calibre 12/70    
  Recipe with RS12 Recipe with RS20
Shell Fiocchi 12/70 T2 plastic Fiocchi 12/70 T2 plastic
Primer Fiocchi 616 (high power) Fiocchi 616 (high power)
Powder RS12 RS20
Load 1.88g (29.0gr) 2.20g (33.95gr)
Shot cup B&P Z2M-h21 B&P Z2M-h15
Cork disk -- Kal. 20 3.2mm
Shot 32 g lead (2.7 mm) 36 g lead (2.9 mm)
Crimp 8-point star crimp 6-point star crimp
V3 from a 74 cm barrel Approx. 407 m/s 388 m/s
Pmax, estimate Approx. 520 bar Approx. 580 bar
 
Calibre 12/76  
  Recipe with RS20
Shell Fiocchi 12/76 T4-M plastic
Primer Fiocchi 616 (high power)
Powder RS20
Load 2.38 g (36.7 gr)
Shot cup B&P Z2M-h21
Cork disk --
Shot 36 g lead (3.1mm)
Crimp 6-point star crimp
V3 from a 74 cm barrel 404 m/s
Pmax, estimate Approx. 580 bar

RS24 was also tested in combination with lead shot loads, but was found to be less suitable. However, a good recipe was found for using RS24 with harder shot.

Calibre 12/76  
  Recipe with RS24
Shell Fiocchi 12/76 T4-M plastic
Primer Fiocchi 616 (high power)
Powder RS24
Load 2.33 g (36.0 gr)
Shot cup Gualandi TUBO48
Cork disk 2x cal. 20 3.2 mm
Shot 38.98 g copper (2.8-3.5 mm)
Crimp 6-point star crimp
V2 from a 74 cm barrel 386 m/s
Pmax, estimate Approx. 900 bar

Use a knife to score a criss-cross pattern on the Gualandi shot cup over 60-100% of the shot height This ensures that the shot string is evenly distributed. Specification with copper shot: Hardness less than Vickers 50 HV/1. A ½ choke was used in this instance. Due to the hardness of the projectiles, it is advisable to use a choke that is suitable for steel shot.

We hope this information is helpful and inspires you in your own work. Wishing you all good shooting, great fun and every success with our powders.

Best regards,

Dominik Antenen

The perfect hit!
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