What’s the purpose of this gun after you chop the barrel? CQB only?
Just asking because depending on how much you chop, won’t the ballistics drop along with the accuracy at distance?
So that’ll relegate it to being practically a pistol, which you already have in that caliber...
Now here’s a chart from BallisticsByTheInch.com, they don’t have 5.7, closest (I guess) is .22mag:
Click here for a Muzzle Energy graph for the tests in this caliber.
barrel length | CCI
Game-
point
40 gr.
JSP | CCI
Maxi-
Mag
40 gr.
JHP | CCI
Maxi-
Mag
HP+V
30 gr.
JHP | CCI
V-Max
30 gr.
polymer
tip | Federal
30 gr.
Speer
TNT HP | Fiocchi
PSD
40 gr.
JSP | Fiocchi
PSD
40 gr.
JHP | Hornady
45 gr.
Flex
Tip
eXpand-
ing | Hornady
V-Max
30 gr. | Hornady
25 gr.
NTX | Win'ster
30 gr.
Hornady
Polymer
Tip
V-Max |
19" | 1827 | 1999 | 2285 | 2348 | 2355 | 1908 | 1936 | 1773 | 2296 | 2265 | 2149 |
18" | 1837 | 1985 | 2322 | 2298 | 2324 | 1920 | 1950 | 1764 | 2313 | 2235 | 2110 |
17" | 1825 | 1980 | 2280 | 2288 | 2334 | 1918 | 1938 | 1755 | 2318 | 2241 | 2160 |
16" | 1780 | 1987 | 2316 | 2276 | 2283 | 1887 | 1934 | 1702 | 2252 | 2166 | 2129 |
15" | 1799 | 1967 | 2304 | 2294 | 2275 | 1916 | 1873 | 1738 | 2240 | 2229 | 2127 |
14" | 1783 | 1963 | 2230 | 2298 | 2244 | 1885 | 1951 | 1751 | 2243 | 2250 | 2105 |
13" | 1749 | 1889 | 2181 | 2220 | 2227 | 1852 | 1886 | 1698 | 2245 | 2191 | 2071 |
12" | 1750 | 1881 | 2168 | 2204 | 2163 | 1843 | 1811 | 1699 | 2144 | 2138 | 2052 |
11" | 1709 | 1835 | 2079 | 2097 | 2135 | 1788 | 1845 | 1652 | 2093 | 2146 | 1989 |
10" | 1687 | 1817 | 2060 | 2144 | 2102 | 1791 | 1772 | 1643 | 2069 | 2065 | 1951 |
9" | 1672 | 1759 | 2000 | 2061 | 2018 | 1723 | 1772 | 1630 | 1966 | 2024 | 1924 |
8" | 1594 | 1706 | 1950 | 2012 | 1979 | 1650 | 1696 | 1536 | 1977 | 1928 | 1803 |
7" | 1529 | 1617 | 1887 | 1904 | 1879 | 1626 | 1606 | 1525 | 1821 | 1818 | 1763 |
6" | 1484 | 1575 | 1763 | 1804 | 1821 | 1526 | 1544 | 1454 | 1740 | 1824 | 1694 |
5" | 1355 | 1474 | 1672 | 1723 | 1657 | 1433 | 1477 | 1307 | 1602 | 1670 | 1575 |
4" | 1248 | 1353 | 1510 | 1504 | 1457 | 1287 | 1269 | 1239 | 1379 | 1492 | 1454 |
3" | 1089 | 1160 | 1236 | 1336 | 1228 | 1101 | 1117 | 1049 | 1153 | 1308 | 1288 |
2" | 887 | 946 | 884 | 1085 | 895 | 899 | 853 | 843 | 962 | 1114 | n/a |
So if this is roughly the same as 5.7, and you’re going from 16” to 10”, you’ll only lose about 100-180fps, depending on your load.
Then you gotta determine if that critically changes the performance of the bullet, and if this is all worthwhile for a 6” shorter barrel and the hassle and wait.