Greetings! I recently obtained the HoE: Wasted West book and have a question. Are there two calibers of gyrojet ammo or not? From reading the gyrojet ammo description, it sounds like the .50 is used for the IW-91 and the IW-40, but in the weapon descriptions, it says the IW-91 uses a .45, not a .50 like the IW-40 does. Any clarification appreciated, later. Jeff