Pistol Size & Weight

TFB TV (YouTube Channel) has a couple of terrific videos comparing 9mm and 380 pistols with regards to capacity vs size and weight. This is my modified version of the spreadsheet where I weighted capacity on a diminishing returns basis (see below). If you mouse over the upper right corner of the spreadsheet, you can open it in Google Sheets.

Gun Size Spreadsheets Weighted Rounds

The average gunfight involves less than 4 rounds fired. Many threats are repelled by simply brandishing a firearm. So in my weighting I favor the first 3 rounds of capacity and then give diminishing value for each additional round thereafter as follows:

1 - 1

2 - 2

3 - 3

4 - 3.98

5 - 4.94

6 - 5.88

7 - 6.8

8 - 7.7

9 - 8.58

10 - 9.43

11 - 10.23

12 - 10.98

13 - 11.68

14 - 12.33

15 - 12.93

16 - 13.48

17 - 13.98

To put the size and weight values on approximately equal footing, I multiplied the Weighted Rounds/oz by three when calculating the Weighted Composite.