Cartridge
Bullet
Powder
Charge
Velocity
Notes
.375 SuperMag
200 gr Sierra
AA1680
30.0
1,660
Not as accurate as the 220
.375 SuperMag
200 gr Sierra
H110
25.5
1,634
Max - slower than expected
.375 SuperMag
220 Hornady
IMR 4227
23.0
1,615
Not as good as AA1680
.375 SuperMag
220 Hornady
H110
24.0
1,644
Max - 1.5" at 25 yards
.375 SuperMag
220 Hornady
AA1680
27.0
1,700
Hot - absolute max
.375 SuperMag
245 gr FP
AA1680
26.0
1,620
Max - most accurate load
.375 SuperMag
245 gr FP
H110
22.5
1,575
3.0" at 50 yards
.375 SuperMag
245 gr FP
2400
20.0
1,588
Pretty hot - fair accuracy
.375 SuperMag
245 gr FP
AA5744
22.0
1,513
Max - 1.5" at 50 yards
.375 SuperMag
263 gr cast
H110
21.5
1,481
Fair - 2.0" at 50 yards
.375 SuperMag
263 gr cast
AA1680
20.0
1,474
1.0" at 50 yards
.375 SuperMag
263 gr cast
AA5744
21.0
1,397
Max but very accurate
Fired from a 10.5" Seville.  All loads used Fed 215 or CCI 200 primers.  Reduce by 10% before working-up
to max