The Overwatch
.338 Lapua Magnum
All testing was done with a 26" bolt action rifle.
285 Hornady ELD - M
Caliber - .338 LM
Powder - IMR 7977
Charge Weight -91.5
​
26" Barrel
AVG FPS - 2695
​
THIS DATA IS FROM PERSONAL TESTING, NOT FROM PUBLISHED DATA. NO INFORMATION ON PRESSURE. THERE WAS NO PRESSURE SIGNS NOR HEAVY BOLT LIFT. NEAR MAX WHEN COMPARED TO LIGHTER AND HEAVIER BULLET
285 Hornady ELD - M
Caliber - .338 LM
Powder - 7977
​
89.0 grains - 2611 FPS
90.0 grains - 2645 FPS
90.5 grains - 2660 FPS
91.0 grains - 2665
Coming soon..
Coming soon..
.338 Lapua Magnum Cast Lead Data
All testing was done in a 26" bolt action action rifle with a 9.375 twist. The bullets were hand cast from wheel weights and cold water quenched.
LEE Mold -Â C330-220-1R
It is extremely important to check the RPM rate of cast bullets in barrels with modern twist rates. 140,000 RPM or less is ideal.
220 CL PC .339
Caliber - .338 LM
Powder - Trail Boss
*Subsonic
​
11.5 - 1020 FPS
12.0 - 1050 FPS
12.5 - 1090 FPS
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AVG FPS
220 CL PC .339
Caliber - .338 LM
Powder - Trail Boss
​
17 grains - 1300 FPS
18 grains - 1340 FPS
19 grains - 1382 FPS
20 grains - 1420 Fps
25 grains - 1618 FPS