G'Day Everyone,
New to the forum and recently picked up an FX M4 800mm in both .22 and .35 calibers. I'm diving into the world of precision air gunning for hunting and want to get the most out of the rifle.
I'm currently in the process of gathering data to feed into my ballistic calculator (Alpex 4K) and would greatly appreciate any insights the community might have on the ballistic coefficients (BCs) for various grains of slugs and pellets commonly used in these calibers. I've already started checking manufacturer websites and some review sites, as I understand BC is specific to the projectile.
In addition to BC data, I'm also looking for general starting points for regulator and hammer spring tension for different projectile weights and types in both .22 and .35. I know these settings are highly individual to the rifle and the desired velocity, and a chronograph is essential for proper tuning. My plan is to start with conservative regulator pressures (around 120-140 BAR for pellets and potentially higher for slugs) and mid-range hammer spring settings, then carefully adjust while monitoring velocity to find the sweet spot for accuracy and consistency. I'm also mindful of balancing power with shot count.
Given the STX barrel system, I'm aware that different liners and projectiles might have unique optimal settings. Any experience or data you can share regarding specific slug/pellet combinations and their associated BCs, along with approximate starting regulator and hammer spring settings that have worked well for you on your FX M4 (.22 or .35), would be incredibly helpful in speeding up my initial tuning process and minimizing wasted ammo.
Slugs and Pellets Purchased:
Thanks in advance for any guidance you can offer! Looking forward to being an active member of the community.
OZFeral.
New to the forum and recently picked up an FX M4 800mm in both .22 and .35 calibers. I'm diving into the world of precision air gunning for hunting and want to get the most out of the rifle.
I'm currently in the process of gathering data to feed into my ballistic calculator (Alpex 4K) and would greatly appreciate any insights the community might have on the ballistic coefficients (BCs) for various grains of slugs and pellets commonly used in these calibers. I've already started checking manufacturer websites and some review sites, as I understand BC is specific to the projectile.
In addition to BC data, I'm also looking for general starting points for regulator and hammer spring tension for different projectile weights and types in both .22 and .35. I know these settings are highly individual to the rifle and the desired velocity, and a chronograph is essential for proper tuning. My plan is to start with conservative regulator pressures (around 120-140 BAR for pellets and potentially higher for slugs) and mid-range hammer spring settings, then carefully adjust while monitoring velocity to find the sweet spot for accuracy and consistency. I'm also mindful of balancing power with shot count.
Given the STX barrel system, I'm aware that different liners and projectiles might have unique optimal settings. Any experience or data you can share regarding specific slug/pellet combinations and their associated BCs, along with approximate starting regulator and hammer spring settings that have worked well for you on your FX M4 (.22 or .35), would be incredibly helpful in speeding up my initial tuning process and minimizing wasted ammo.
Slugs and Pellets Purchased:
Brand | Type | Caliber | Type | Grain | Batch |
| JSB | Exact Hades | .35 | Pellet | 77.16 | |
| JSB | Exact | .35 | Pellet | 81.01 | |
| JSB | Exact Jumbo Heavy | .22 | Pellet | 18.13 | 84060024 |
| JSB | Exact Jumbo RS | .22 | Pellet | 13.43 | |
| JSB | Hades | .22 | Pellet | 15.89 | |
| NSA | HPFB | .35 | Slug | 93 | |
| JSB | Knockout MK II | .22 | Slug | 25.39 |
Thanks in advance for any guidance you can offer! Looking forward to being an active member of the community.
OZFeral.
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