It is not difficult to fire the first shot. I hunt with mine, and have nothing but 100% reliability with it.
Excellent accuracy will be had with the Lyman 451114 mold designed especially for the Parker-Hale Volunteer. Bullets should be made of soft lead, pure lead if available. The barrel is made for long bullets. Pistol bullets made of soft lead might work; try some and see. I doubt they will be as accurate as a longer bullet such as the Lyman.
Nipple erosion is not an issue. Just buy a new one every few years. My best load uses FFFg powder.