This 25-pack of spherical .68 caliber hard nylon plastic balls is ideally matched with the Ram-Shell cartridge. Insertion depth is near the front opening: use 10-20 lb of force to seat, approximately 1/4" to 3/8" deep (6mm-10mm).
The smooth blue nylon projectile is intended for controlled target use with a suitable backstop. Hard projectiles may ricochet, rebound, or fragment after striking hard surfaces; select the training area and backstop accordingly.