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