Interesting bullet.

It appears Swiss P loads it in .308 Subsonic as well.

Quote.... "The Final is perfect in urban combat environment, in counter-terrorism/hostage rescue operations, and in other environments where even the slightest chance of bullet ricochet or over penetration must be avoided at all costs."

Quote from Swiss P concerning the subsonic 308 load using the same bullet.

The unique bullet made from pressed pellets instantaneously disintegrates when hitting a soft target even at subsonic speed. The penetration depth of the fragments is extremely small, minimising the risk of over penetration and increasing the safety of bystanders. This makes it the perfect round for missions in urban terrain. The heavy subsonic bullet provides enough energy to achieve a good terminal target effect.
Optimised for use in suppressed weapons. The muzzle bang is minimised and the supersonic bang is eliminated.

   Outstanding stopping power avoids collateral damage due to total bullet disintegration
   Provides a minimal accoustic profile to maintain the element of surprise
   Best first hit probability due to a special loading technique
   Blue marked primer ensures proper selection

I can't find it on Swiss P's webpage... but, https://www.munitionsdepot.ch/RUAG-Swiss-P-Final-Subsonic-300-Whisper-200grs-20-Stk



3) .300 Whisper SWISS P Subsonic Final.  The calibre .300 Whisper was especially designed for subsonic shooting.  The proportion of the chamber size and the amount of powder are optimized to ensure constant pressure build up and first hit probability.

The special bullet made from pressed pellets instantaneously disintegrates when hitting a soft target even at subsonic speed.  The penetration depth of the fragments is extremely small, minimizing the risk of over penetration and increasing the safety of bystanders.

Optimized for use in suppressed weapons, the muzzle bang is minimized and the supersonic crack is eliminated.  Excellent first hit probability

   For silent and highly accurate secondary target shooting
   Perfectly suitable for missions in urban terrain without attracting attention or loosing the element of surprise
   All components are specially designed and adjusted to each other
   Long weapon durability due to minimal barrel wear and smoke residue build up

Specifications:

   Bullet: tin plated tombac jacket contained pressed lead pellets, weight 13.0 g / 200 grains
   Case: brass, with SINOXID non-corrosive primer
   Cartridge weight: 21.0 g / 324 grains
   Muzzle velocity: 310 m/s (1,017 fps) from 450 mm (17.7 inch) barrel
   Muzzle energy:  625 J (464 ft lbs)
   Accuracy at 50 m: 100% radius = 100 mm (4 inches)
   Packaging: in cardboard boxes of 20 or 600 rounds.


More or less a repeat of info... but..