Factory Rounds Chronograph Data

[Coltitis]

I recently ran some factory rounds over the chronograph, firearm was a new Wilson Combat Tactical Elite.  I posted this on 1911.com but thought that this forum is a good place to post it too.

Georgia Arms 180 grain Full Metal Jacket
High 1135.3
Low 112.6
ES 22.7
Mad 5.3
Avg 1125 Note: Georgia Arms rates these at 1100 fps

Remington 180 grain Full Metal Jacket
High 1130.1
Low 1108.8
ES 21.3
Mad 7.6
Avg 1119.6

Hornady 180 grain XTP
High 1212.4
Low 1183.7
ES 28.7
Mad 6.6
Avg 1196.2 Note: Hornady rates these at 1180 fps

Underwood 180 grain JHP "Delta Elite Load" Item #240
High 1264.7
Low 1213.7
ES 50.9
Mad 11.6
Avg 1242.6 Note: Underwood rates these at 1240 fps

Underwood 180 grain T.M.J Item #241
High 1323.1
Low 1263.0
ES 60.1
Mad 16.8
Avg 1303.0 Note: Underwood rates these at 1300 fps

Underwood 155 grain XTP item #232
High 1488.6
Low 1416.9
ES 71.7
Mad 27.6
Avg 1451.8 Note: Underwood rates these at 1500 fps

Average temperate during the shooting session was 98-100 degrees. As you can see, the average speed that I recorded is pretty close to the factory ratings. The Underwood 155 grain Hornady XTP was the farthest off by about 50 fps. All in all not bad considering the differences in test firearms and conditions.

[Intercooler]

Wonder why the spreads are so high?

[Coltitis]

Wonder why the spreads are so high?

That's a good question.  The only thing that I noticed is that the spread increased with the higher velocity rounds. 

[The_Shadow]

Thanks for the report Coltitis...confirms things as from you gun as compared to others!

[Intercooler]

What Chrony and what's the setup of the pistol?

[Coltitis]

What Chrony and what's the setup of the pistol?

Its a older Pack Chronograph, probably about 20 years old.  The pistol is a new Wilson Combat Tactical Elite with the flanged 5" barrel.

[Coltitis]

Thanks for the report Coltitis...confirms things as from you gun as compared to others!

Thank you Sir.  I always like to know what the velocity readings are from factory loads and my reloads.   

[sqlbullet]

The fact that the extreme spread and the mean absolute deviation both increased dramatically with Underwood ammo would indicate that quality control isn't as high.

That may be an issue at Underwood, or it may be an issue up stream in the components he is getting.

[4949shooter]

The spreads could be due to the recoil spring weight.

[sqlbullet]

I might by recoil spring weight in a Glock where spring weight has a huge impact on unlock timing.  But in a 1911 that shouldn't be a significant factor.