Glaser Safety Slugs come in two forms; the blue-tipped bullets encase No. 12 shot and the silver-tipped bullets No. 6 shot. Previous tests showed you can expect about 7 inches of penetration from the silver Glaser Slug and the blue-tipped bullet drove shot and jacket fragments to around 6.5 inches. Surprisingly, penetration depth did not vary when the bullet was fired from a 5- or 3.3-inch barrel, even though velocity varied by as much as 150 fps. However, the wound cavity was noticeably larger from the bullet with the higher velocity.
.45 ACP Glaser Blue Safety Slug
Nighthawk GRP 1911 (5-inch) & Sig 1911 Ultra (3.3-inch)