As the name implies, this makes these rifles better suited for firing heavier projectiles such as slugs.
This depth is important for precision and the ideal depth may differ from projectile.
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- 5.5mm (.22) probe
This is adjustable in length so that the setting depth can be adjusted. It can also be used in caliber 6.35 (.25) and 7.62 (.30) by means of secured socket sleeves. - Heavier hammer weight
Thanks to the heavier hammer weight, the valve lets more air through.Ultimately, a speed gain of about 30 m/s (95 fps) can be achieved and a second gain is in the increased purity due to the adjustable setting depth.
- 5.5mm (.22) probe
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