Test Gun: Colt 1911 Government, Defender.
Barrel length: 5 and 3 inches.
Ammunition: Winchester .45 ACP 185gr Silvertip JHP .
Test media: 10% Clear Ballistics Gel.
Distance: 10 feet.
Chronograph: Caldwell Ballistic Precision Chronograph G2.
Five shot velocity average: 993, 902fps
Gel Temperature 70 degrees.
The Silvertip round has been around for some time and gone through at least a few changes. I remember buying some in .45 ACP back in the ’80s and at that time the jackets were made out of aluminum. I think the idea was that aluminum would allow better expansion than the traditional copper jacket. Now the jackets are made out of nickel-coated copper.
Something new in this test is the addition of a short-barreled Colt Defender. The 3-inch barrel should make for some interesting comparisons to the longer 5-inch Government model.
With the Government model I got a five-shot average velocity of 993fps with a high of 1002fps and a low of 988fps. From the Defender I got a four shot avrage of 902fps with a high of 919fps and a low of 884fps.
When shooting in the bare gel the first round had a velocity of 1005fps and penetrated to 14.25 inches. The recovered weight was 181.2 grains and the final expansion was .73 inches. The second round had a velocity of 989fps and expanded to .71 inches. The recovered weight was 182.3 grains and it penetrated to 13.5 inches.
The first round in the clothing covered gel was not recorded. The bullet penetrated to 14.5 inches and expanded to .70 inches and had a weight of 183.6 grains. The second round had a velocity of 1003fps and penetrated to 13.5 inches. The recovered weight was 183.1 grains and expanded to .72 inches.
Out of the short-barreled Defender the first round’s velocity of 900fps and penetrated to 12 inches. The recovered weight was 179.4 grains and expanded to .69 inches. Round two’s velocity was 913fps and penetrated to 14 inches. It’s recovered expansion was .67 inches and its weight was 182.5 grains.
When pulling the second bullet, from the gel block, a small disk fell on top of the block. If you look closely at the pictures of the expanded bullets you can make out a star-shaped impression in the face of the bullets. You can also see the disk tangled up in the clothing material on the first bullet recovered from the clothing covered gel.
My guess is Winchester is using a method similar to how Speer makes their Gold Dot. The method involves punching a hole at the top of the bullet forming the hollow point. This process is what leaves the “gold dot” in the on the face of the expanded bullet. Since the Gold Dot is a plated bullet the gold dot remains attached to the lead portion of the bullet. With the Silvertip bullet, it’s a conventional style jacket and not bonded to the core the disk separates from the bullet upon expansion.