The setup. 450 Bushmaster 20". Nikko Stirling scope, Ross Brake, Recoil-less A1 Stock. Chronograph is a Chrony F1 with the remote head and home brew recall switch set approximately ten feet in front of muzzle.
Distance for these tests is 50 yards.
NOTE! THESE LOADS ARE NOT IN THE BOOKS!
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All powder charges were individually hand measured on digital scales with a powder trickler and confirmed on a beam scale. Bullets were seated to Thunk in my chamber. Also all loads were Legendre Side crimped, then Taper Crimped. Now that we have that out of the way, Here we go...
MagTech 230 Grain FMJs
WSR primers
Hornady factory new brass
COAL 2.125
Powder is LilGun
Charges- five rounds each at:
44.0 grains
44.3 grains
44.5 grains
45.0 grains
LeGender side crimped .025" from case mouth. Followed by a taper crimp to .476".
76 deg
71% humid
Wind S @ 12-20---------------------------------------------------------------------------
First string 44 grains
2472 FPS
2419
2444
2499
Avg 2459fps
ES 80.45
SD 34.59
No sooting and all shells ejected @ 3 O'clock.
Measured fired cases
.497" - 1.692"
.498" - 1.688"
.498" - 1.692"
.498" - 1.688"
*.498" - 1.689"* steel plate/far left-negative
Second String 44.3 Grains
2509FPS
2493
2447
2501
2519
Avg 2494 FPS
ES 71.82
SD 27.87
No soot higher velocity shells ejected @ 2&3 O'clock while lower velocities ejected closer to 1 o'clock.
.498"- 1.688"
.498"- 1.686"
.498"- 1.688"
.497"- 1.686"
.498- 1.688"
Third String
44.5 Grains
2504 FPS
2491
2529
2506
Avg 2507fps
ES 37.48
SD 15.77
no sooting and higher velocity shells ejected @ 2 O Clock lower velocities @ 1 Oclock.
.497"- 1.690"
.498"- 1.688"
.497"- 1.689"
.497"- 1.689"
*.497"- 1.689"* steel plate/ center placement-positive
Fourth String
45.0 Grains
2515 FPS
2540
2490
2530
Avg 2515fps
ES 50.70
SD 21.74
No sooting- Ejection @ 2 Oclock and a bit of muzzle flash.
.498"- 1.690"
.497"- 1.688"
.497"- 1.689"
.497"-1.690"
*.497"- 1.689"* steel plate/ under old tests' I & II strikes- positive