This is a video of different shotgun primers being tested for velocities using wax bullets for .45lc. It is an inexpensive way to practice at around 6 cents a shot. The wax bullets also come in .38 Special. Speeds are very similar to actual rounds.
[video=youtube;6Kx2L_5w4NU]http://www.youtube.com/watch?v=6Kx2L_5w4NU&feature=c4-overview&list=UUB5A4jxSoxo79zhlqIl310A[/video]
[video=youtube;6Kx2L_5w4NU]http://www.youtube.com/watch?v=6Kx2L_5w4NU&feature=c4-overview&list=UUB5A4jxSoxo79zhlqIl310A[/video]