So i always hear how a short 300 win mag is useless blah blah and might as well get a 308 and so on. So needless to say i wanted to to some load testing with 208 amax and compare to other longer barrels. The rifle is a Tactical Rifles, INC 300 win mag with 20" Krieger barrel, 10 twist.
TR 300win mag
Federal 215M primer
PPU brass
208 amax COAL 3.530"
Magpro powder
70deg temp
80.0gr= 2742,2736,2739,2746,2739 Avg= 2740 ft/sec
80.5gr= 2766,2771,2783,2764,2773 Avg= 2771 ft/sec
81.0gr= 2783,2789,2783,2781,2786 Avg= 2784 ft/sec
81.5gr= 2795,2824,2830,2812,2818 Avg= 2815 ft/sec
<span style="font-weight: bold">81.8gr= 2824,2812,2861,2888,2886 Avg=2854 (sticky bolt)
82.1gr= 2860,2840,2832,2829,2836 Avg= 2839(Very sticky bolt)</span>
The 81.8 and 82.1gr were too much. The 81.5gr had no sticky bolt and slight flatten primers. Everything else below that amount had no sign of pressure. But to basically get 2815 ft/sec safely from a 20" barrel is pretty amazing. When you plug in the numbers for a 26" barrel at 2900-2950ft/sec you are only gaining 2" of wind drift for a 5mph wind. Obviously you lose some elevation but you just dial that in. For having such a short and handy rifle i think it is a win win.
Also even with the 20" barrel and above velocity it does not go subsonic until ~1600 yards. So this is to prove that a 20" win man is NOT the same as a 308.
TR 300win mag
Federal 215M primer
PPU brass
208 amax COAL 3.530"
Magpro powder
70deg temp
80.0gr= 2742,2736,2739,2746,2739 Avg= 2740 ft/sec
80.5gr= 2766,2771,2783,2764,2773 Avg= 2771 ft/sec
81.0gr= 2783,2789,2783,2781,2786 Avg= 2784 ft/sec
81.5gr= 2795,2824,2830,2812,2818 Avg= 2815 ft/sec
<span style="font-weight: bold">81.8gr= 2824,2812,2861,2888,2886 Avg=2854 (sticky bolt)
82.1gr= 2860,2840,2832,2829,2836 Avg= 2839(Very sticky bolt)</span>
The 81.8 and 82.1gr were too much. The 81.5gr had no sticky bolt and slight flatten primers. Everything else below that amount had no sign of pressure. But to basically get 2815 ft/sec safely from a 20" barrel is pretty amazing. When you plug in the numbers for a 26" barrel at 2900-2950ft/sec you are only gaining 2" of wind drift for a 5mph wind. Obviously you lose some elevation but you just dial that in. For having such a short and handy rifle i think it is a win win.
Also even with the 20" barrel and above velocity it does not go subsonic until ~1600 yards. So this is to prove that a 20" win man is NOT the same as a 308.
