I freely admit I ate some crow in

an earlier thread regarding recoil energy (mainly) because I had the wrong velocities ingrained in my memory for 115gr and 124gr. I did a little research, and thought I'd share it here.

The short, inconvienient answer:

**Recoil really depends mostly on how fast each relative object being compared is moving.**
The crow I ate was because:

**I did not realize just how "weak" many current 9mm target factory loadings had become for 115gr and 124gr.**
Concern I then shared:

**Folks shoot "weak" factory 115gr (~1150fps) or 124gr (~1050fps) target loads thinking "Sweet, light recoil", then load up that 124gr +p (~1250fps) defensive load and have a slightly different experience. This does not occur w/ 147gr.**
Numbers I ran using factory data to satisfy my curiousity:

Weight = Velocity = Free Recoil Energy in ft/lbs

Blazer FMJ

115 = 1145 = 7.14

124 = 1090 = 7.39

147 = 950 = 7.76

Federal FMJ

115 = 1180 = 7.53

124 = 1150 = 8.13

147 = 1000 = 8.50

Federal HST

115 = N/A

124 = 1150 = 8.13

147 = 1000 = 8.50

124 +p = 1200 = 8.77

147gr +p = 1050 = 9.28

S&B FMJ

115 = 1287 = 8.78

124 = 1188 = 8.62

147 = N/A

Remington GSHP

115 = 1180 = 7.53

124 = 1125 = 7.82

147 = 990 = 8.35

Remington Express

115 = 1250 = 8.33

124 = 1100 = 7.52

147 = 990 = 8.35

Gold Dot

115 = 1210 = 7.87

124 = 1220 = 9.04

147 = 985 = 8.28

Winchester FMJ

115 = 1190 = 7.64

124 = 1140 = 8.01

147 = 990 = 8.35

Winchester Ranger T-Series

115 = N/A

124 = 1250 = 9.44

147 = 990 = 8.35

Winchester Ranger JHP

115 = 1335 = 9.37

115 = 1225 = 8.04

Double Tap

115 +p = 1415 = 10.40

124 +p = 1310 = 10.27

147 +p = 1135 = 10.69

Fiocchi FMJ

115 = 1260 = 8.45

124 = 1180 = 8.26

147 = 1000 = 8.50

MagTech

115 = 1155 = 7.25

115gr +p = 1328 = 9.28

124 = 1109 = 7.62

147 = 990 = 8.35

Wolf

115 = 1150 = 7.19

124 = 1130 = 7.88

147 = 985 = 8.28

PMC FMJ

115 = 1160 = 7.30

124 = 1110 = 7.64

147 = N/A

__Sorted by Free Recoil Energy:__
Make, Weight, Velocity Recoil (ft/lbs)

Blazer FMJ 115 1145 7.14

Wolf 115 1150 7.19

MagTech 115 1155 7.25

PMC FMJ 115 1160 7.30

Blazer FMJ 124 1090 7.39

Remington Express 124 1100 7.52

Federal FMJ 115 1180 7.53

Remington GSHP 115 1180 7.53

MagTech 124 1109 7.62

Winchester FMJ 115 1190 7.64

PMC FMJ 124 1110 7.64

Blazer FMJ 147 950 7.76

Remington GSHP 124 1125 7.82

Gold Dot 115 1210 7.87

Wolf 124 1130 7.88

Winchester FMJ 124 1140 8.01

Winchester Ranger JHP 115 1225 8.04

Federal FMJ 124 1150 8.13

Federal HST 124 1150 8.13

Fiocchi FMJ 124 1180 8.26

Gold Dot 147 985 8.28

Wolf 147 985 8.28

Remington Express 115 1250 8.33

Remington GSHP 147 990 8.35

Remington Express 147 990 8.35

Winchester FMJ 147 990 8.35

Winchester Ranger T-Series 147 990 8.35

MagTech 147 990 8.35

Fiocchi FMJ 115 1260 8.45

Federal FMJ 147 1000 8.50

Federal HST 147 1000 8.50

Fiocchi FMJ 147 1000 8.50

S&B FMJ 124 1188 8.62

Federal HST 124 1200 8.77

S&B FMJ 115 1287 8.78

Gold Dot 124 1220 9.04

Federal HST 147 1050 9.28

MagTech 115 1328 9.28

Winchester Ranger JHP 115 1335 9.37

Winchester Ranger T-Series 124 1250 9.44

Double Tap 124 1310 10.27

Double Tap 115 1415 10.40

Double Tap 147 1135 10.69

Notes & Assumptions:

Recoil Calculator
Velocity pulled from manufacturer website today

115gr = 4.6gr powder*

124gr = 4.4gr powder*

147gr = 4.2gr powder*

1lb = handgun weight

**Manufactures don't list powder charge weight. I suspect slight variations and more velocity to come from more of the same powder, or same/less of a faster powder. And, heavier bullets use less powder as they have less remaining case volume and greater weight. Still, differences of 0.xgr in powder amounts will not skew results significantly.*
__Observations:__
If the 147gr is traveling at 950fps:

- 115gr needs to be traveling >1214fps

- 124gr needs to be traveling >1126fps

for the

__147gr__ to have

__less__ recoil.

If the 124gr is traveling at 1050fps:

- 115gr needs to be traveling >1132fps

for the

__124gr__ to have

__less__ recoil.

__Others:__
**147gr vs. 115gr**
If 147 = 900 , then 115 velocity > 1150 fps

If 147 = 925 , then 115 velocity > 1182 fps

If 147 = 950 , then 115 velocity > 1214 fps

If 147 = 975 , then 115 velocity > 1246 fps

If 147 = 1000 , then 115 velocity > 1278 fps

If 147 = 1025 , then 115 velocity > 1310 fps

If 147 = 1050 , then 115 velocity > 1342 fps

If 147 = 1075 , then 115 velocity > 1374 fps

If 147 = 1100 , then 115 velocity > 1406 fps

**147gr vs. 124gr**
If 147 = 900 , then 124 velocity > 1067 fps

If 147 = 925 , then 124 velocity > 1097 fps

If 147 = 950 , then 124 velocity > 1126 fps

If 147 = 975 , then 124 velocity > 1156 fps

If 147 = 1000 , then 124 velocity > 1185 fps

If 147 = 1025 , then 124 velocity > 1215 fps

If 147 = 1050 , then 124 velocity > 1245 fps

If 147 = 1075 , then 124 velocity > 1274 fps

If 147 = 1100 , then 124 velocity > 1304 fps

**124gr vs. 115gr**
If 124 = 1050 , then 115 velocity > 1132 fps

If 124 = 1075 , then 115 velocity > 1159 fps

If 124 = 1100 , then 115 velocity > 1186 fps

If 124 = 1125 , then 115 velocity > 1213 fps

If 124 = 1150 , then 115 velocity > 1240 fps

If 124 = 1175 , then 115 velocity > 1267 fps

If 124 = 1200 , then 115 velocity > 1294 fps

If 124 = 1225 , then 115 velocity > 1321 fps

If 124 = 1250 , then 115 velocity > 1348 fps

If 124 = 1275 , then 115 velocity > 1375 fps

If 124 = 1300 , then 115 velocity > 1402 fps

If 124 = 1325 , then 115 velocity > 1429 fps

If 124 = 1350 , then 115 velocity > 1456 fps