Test Gun: Sig P229, S&W Shield.
Barrel length: 3.9 inches, 3.1 inches.
Ammunition: Federal .40S&W 180gr HST ()
Test media: 10% Clear Ballistics Gel.
Distance: 10 feet.
Chronograph: PACT 1 XP with inferred sky screens.
Gel Temperature 72 degrees.
Finally, a few days of warm weather and some spare time gave me a chance for another test. I contacted Clear Ballistics asking about block temperature. Even though the gel blocks are stored and shot inside, the cold weather made me wonder how the cooler than normal temperature would affect the blocks. Clear Ballistics informed me that the blocks should be shot at a temperature between 70 to 85 degrees. I purchased a food thermometer so I could monitor the block temps before shooting.
The first round from the Sig P229 into bare gel had a velocity of 964fps, penetrate to 15.25 inches, and expanded to .74 inches. The next shot hit at 986fps then penetrated to 14.5 inches and expanded to .76 inches.
Round one in through the heavy clothing had a velocity of 965fps, penetrated to 19.5 inches and expanded to .71 inches. Round two’s velocity was 967fps. It penetrated to 17 inches and expanded to .70 inches.
In the S&W Shield, the first round in bare gel had a velocity of 907fps, expanded to .72 inches with a penetration of 14.25 inches. The last round hit at 876fps with a penetration of 13.5 inches and an explanation of .77 inches.