300 Weatherby, 180gn Nos AB, CCI250, H1000 in Mark V

tpe187

tpe187

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New to me 1984 Weatherby Mark V 26" in 300 WBY. Pleasantly surprised that the first factory load I tried (Weatherby 180 TTSX) shot 3/4" groups at 3200fps. More surprised that I found a great load within 10 shots of initial load development with H1000 and 180 Nosler Accubonds printing .462" for 3 shots with an ES of 2.6 and SD of 1.1, and an avg velocity of 3237fps. I will need a larger sample size and need to stretch the legs a bit, but I'm very hopeful.
 

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Here’s another to look at , 300 wby, 200 grain partition 83 grains imr 7828. 3040 fps. I also get the same results with 81 grains of h1000 and a 200 grain accubond. Speeds within 2 fps of each other on powders. Weatherby brass , fed 215 gm primers. She’s a shooter.
 

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Str8meat said:
Here’s another to look at , 300 wby, 200 grain partition 83 grains imr 7828. 3040 fps. I also get the same results with 81 grains of h1000 and a 200 grain accubond. Speeds within 2 fps of each other on powders. Weatherby brass , fed 215 gm primers. She’s a shooter.
Click to expand...
Yep, 200gn accubonds are next on the list. Haven't been able to locate any 7828 or fed 215gm, but I'll get there eventually. Thanks for the information!
 
7828 has been “ discontinued “ I have 100 rounds of that recipe,loaded already for the fall. Also an additional 150 of the h1000 recipe.
 
if you find some it would be a good idea to buy it. I haven’t seen any in 4 years. My main elk rifle is a 338 rum 225 accubond at 3050 fps fueled by 92 grains of 7828. Been my go to load for 20 years and now it’s not available.
 
The three 300s that I have had, a SouthGate FN, A Mauser barreled by Harry McGowen and another by CP Donnelly all did very well with H 4381. But in deference to the machined lower lug I loaded the 180 grain BBCs to 3100 fps.
 
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