I would like to use a pistol caliber rifle. i.e a Hi-Point 40. It seems like this would fall under rule 7 but how and when does this rule apply.

I'm just guessing but it looks like who ever hosts the match must offer a pistol caliber division for rifle.

You can sub a PCC for any division but you do not enjoy the scoring concessions for PCC if you're signed up for Factory or Practical. The same idea for the Heavy divisions.

7.0.1c Covers what you're talking about.


7.0.1 UNLIMITED, PRACTICAL & FACTORY DIVISIONS

Cartridge, Caliber & Gauge Requirements

a) Pistol: the minimum cartridge case dimensions are: 9x19mm, 9mm Luger, 9mm Parabellum, 9mm NATO or 9mm.

b) Rifle: .223 (5.56 x 45mm NATO) minimum rifle caliber.

c) FEATURED CLUB CONCESSION RIFLE: Pistol calibers are allowed. Minimum caliber is 5.7 x 28mm and maximum caliber is .45 ACP. Competitors must be registered in Pistol Caliber Divisions to be eligible for scoring concessions or be restricted to standard division scoring requirements.