[Kallatari]

In my house rules, I also use a single roll, but I only apply the normal psi modifiers to the roll to see if it manifests or not (so a failure with only those modifiers means a repeated attempt, and it determines if it's a critical failure to manifest or not, etc.), and, assuming it successfully manifested, I then also apply the combat-only modifier (lighting, range, cover, etc.) to see if it the bullet hits the target. Failure to hit the target does not trigger a repeated attempt effect.