300 gr Chinchaga RBT ST Hybrid bullets, Alliant's Reloder 33 powder, Federal GM215M primers all crammed into new unfired Norma made 300 RUM brass necked up to 338 cal. via a "PMA TOOl" .338" neck expander then neck sized in a Redding 338 Edge FL die (without disturbing the shoulder and body) about 7/8 down the neck giving a neck ID of .335" for .003" bullet tension, case length after all sizing done is 2.825"...
unturned neck walls are .015" thick per side and loaded round neck OD is .368" allowing for .002" per side neck clearance in a .372" neck/chamber diameter..........
Rem 700, 30" 9.5 tw 5R Obermeyer barrel
300 gr Chinchaga RBT ST Hybrid bullets WS2 coated
COAL 3.845" CBTO 3.005" .020" jump to rifling
Reloder 33 powder in all loads........
I started load developement at a low starting point as usual, to create a known velocity table for powder/bullet combo and to watch velocity build in .5 gr increments....... all loads fired over a Magnetospeed chronograph....... 87.0 gr thru 94.5 gr were single shots to find velocity then, 95.0 gr thru 99.5 gr are 4 shot averages, I loaded for a 3 shot group each + 1 extra for water jug test in the event I reached pressure and had to stop I had an extra round per load charge for water jug test, I ended up shooting all without reaching any signs of pressure and the 99.5 gr extra round was used on water jugs at 50 yards with velocity at 2836 fps, bullet destroyed 4 water jugs and was recovered in the 5th water jug.... expanded slug weighs 165 gr for 55% weight retention......
mushroom measurements are 1.134" wide by .720" wide and .725" height......
phenomenal expansion and penetration !
Since I didn't hit pressures with the 99.5 gr loads, next I am loading up to 103,0 gr and will post final data at a later date after the shooting's done,
single shot velocity
87.0 gr 2453 fps
87.5 gr 2458
88.0 gr 2463
88.5 gr 2472
89.0 gr 2480
89.5 gr 2493
90.0 gr 2495
90.5 gr 2500
91.0 gr 2525
91.5 gr 2535
92.0 gr 2562
92.5 gr 2569
93.0 gr 2586
93.5 gr 2606
94.0 gr 2634
94.5 gr 2660
4 shot average velocity
95.0 gr 2673 fps
95.5 gr 2682
96.0 gr 2705
96.5 gr 2726
97.0 gr 2750
97.5 gr 2762
98.0 gr 2780
98.5 gr 2791 (3rd target 100 yard 3 shot group & 50 yard rock)
99.0 gr 2801 (2nd target 100 yard 3 shot group & 50 yard rock)
99.5 gr 2832 (1st target 100 yard 3 shot group in video)
99.5 gr 2836 fps (water jugs)
https://www.youtube.com/watch?v=opWQ64AfmEs
unturned neck walls are .015" thick per side and loaded round neck OD is .368" allowing for .002" per side neck clearance in a .372" neck/chamber diameter..........
Rem 700, 30" 9.5 tw 5R Obermeyer barrel
300 gr Chinchaga RBT ST Hybrid bullets WS2 coated
COAL 3.845" CBTO 3.005" .020" jump to rifling
Reloder 33 powder in all loads........
I started load developement at a low starting point as usual, to create a known velocity table for powder/bullet combo and to watch velocity build in .5 gr increments....... all loads fired over a Magnetospeed chronograph....... 87.0 gr thru 94.5 gr were single shots to find velocity then, 95.0 gr thru 99.5 gr are 4 shot averages, I loaded for a 3 shot group each + 1 extra for water jug test in the event I reached pressure and had to stop I had an extra round per load charge for water jug test, I ended up shooting all without reaching any signs of pressure and the 99.5 gr extra round was used on water jugs at 50 yards with velocity at 2836 fps, bullet destroyed 4 water jugs and was recovered in the 5th water jug.... expanded slug weighs 165 gr for 55% weight retention......
mushroom measurements are 1.134" wide by .720" wide and .725" height......
phenomenal expansion and penetration !
Since I didn't hit pressures with the 99.5 gr loads, next I am loading up to 103,0 gr and will post final data at a later date after the shooting's done,
single shot velocity
87.0 gr 2453 fps
87.5 gr 2458
88.0 gr 2463
88.5 gr 2472
89.0 gr 2480
89.5 gr 2493
90.0 gr 2495
90.5 gr 2500
91.0 gr 2525
91.5 gr 2535
92.0 gr 2562
92.5 gr 2569
93.0 gr 2586
93.5 gr 2606
94.0 gr 2634
94.5 gr 2660
4 shot average velocity
95.0 gr 2673 fps
95.5 gr 2682
96.0 gr 2705
96.5 gr 2726
97.0 gr 2750
97.5 gr 2762
98.0 gr 2780
98.5 gr 2791 (3rd target 100 yard 3 shot group & 50 yard rock)
99.0 gr 2801 (2nd target 100 yard 3 shot group & 50 yard rock)
99.5 gr 2832 (1st target 100 yard 3 shot group in video)
99.5 gr 2836 fps (water jugs)
https://www.youtube.com/watch?v=opWQ64AfmEs
