Did a little load work for the 458x1.8 Whitworth 458 Win Mag 24" barrel
Cut down some 300 Win Mag cases and trimmed to 1.79
350 TSX
CCI 250 primers
OAL 2.80
Taper crimp
RL-7
49gr-1810fps ES 51
50gr-1827fps ES 54
51gr-1884fps ES 17
52gr-1934fps ES 6
53gr-1977fps ES 22
54gr-2004fps ES 8
55gr-2025fps ES 17
56gr-2057fps
All grouped 3/8's or less at 50 yds
No signs of pressure,fairly mild shooting
Shells work good in the magazine and pick up and chamber smoothly.
May try to go another couple of grains of powder but the 56grs load is getting compressed pretty good
Should be a good 200 yard rifle with the 350 gr TSX
May try some 300 gr TSX but that is getting pretty light for caliber but would like to see the velocity on those.
