300WM 166HH

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Muddyboots

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Ok, finally got around to 166HH in 300WM.
Sendero 26" 1:10tw
COAL 3.64
CBTO 2.96
Set back 0.020
R-P 5x firing
FM215
Crimped - yes 1/8
Ramshot Hunter
76.0=3256
77.0=3252? No clue
78.0=3333
78.5=3341 velocity flattening
79.0=3375 slight ejector stopped

Getting better at not wasting bullets!

Working up Hodgdon H100V ladder with 166HH. Also looking at Alliant Power Pro 4000 R as well. Will advise.

This load was deemed safe in my rifle. Work up any load using safe standard reloading practices.

Edit added 4/1/23: all Hammer bullets are swirled in graphite powder at seating lubricant.
 
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I’m interested to see how the H100V works with the 166 HH. I’ve been thinking of trying the 166 HH in my 300 win mag and have 5 lbs of H100V.
 
FWIW Seeing 3450 with 75.0gr H4350 in 26” 9twst out of my 300wm. Believe I gave H100V a go but don’t have notes handy. No faster or would have gone with it😎
 
Interesting thread. I have a 300 RUM. I've been working on loads with H4350 and H4831SC and the 151 AH. It seems like we are always moving to faster powders with Hammers. I'm thinking about trying the 166HH in the RUM, but am really leaning to light and fast - 4200fps with the 124!
 
I was able to get 3600 fps with 82 gr of H4350 in Peterson Long brass. There was a very light ejector mark at that point so I stopped there. Never went back to develop a load using that bullet.
 
That really intrigues me! I thought principal advantage of the Peterson long brass was longevity, not more velocity? In theory, once fired brass is stretched to conform to chamber, it should all pressure out the same, no? @Richcotte, I believe you picked up approx. 150fps by switching brass alone, correct? That seems like a huge jump. Did you see this large a pickup in velocity with all the tested pills?
 
Bojo34 said:
That really intrigues me! I thought principal advantage of the Peterson long brass was longevity, not more velocity? In theory, once fired brass is stretched to conform to chamber, it should all pressure out the same, no? @Richcotte, I believe you picked up approx. 150fps by switching brass alone, correct? That seems like a huge jump. Did you see this large a pickup in velocity with all the tested pills?
Click to expand...
I’ll have to go back and review the data for exact values, but the short answer is yes.
 
les said:
Interesting thread. I have a 300 RUM. I've been working on loads with H4350 and H4831SC and the 151 AH. It seems like we are always moving to faster powders with Hammers. I'm thinking about trying the 166HH in the RUM, but am really leaning to light and fast - 4200fps with the 124!
Click to expand...
Gday Les
I’m Only a new member here 🤪
Are you trying to corrupt me or what 😜
Carry on looking forward to your results
Cheers
 
Bojo34 said:
That really intrigues me! I thought principal advantage of the Peterson long brass was longevity, not more velocity? In theory, once fired brass is stretched to conform to chamber, it should all pressure out the same, no? @Richcotte, I believe you picked up approx. 150fps by switching brass alone, correct? That seems like a huge jump. Did you see this large a pickup in velocity with all the tested pills?
Click to expand...
Ok, I went back and reviewed my velocity testing data and found that the answer varies by pill. The most significant difference was found with the old 152HH.

All loads are with H4350 and WLRM primers
166HH: average of ~60 fps gain
160HH: No significant velocity change, but difference in pressure signs. FC brass showed heavy bolt lift and ejector marks at 78 gr where Peterson Long showed no indications at 81 gr
152HH: FC brass pressured out @ 80 gr & 3200 fps, Peterson Long got 3577 fps @ 80 gr with no pressure and was able to reach 3700 fps @ 84 w/ very slight ejector mark
137HH: No significant velocity change, but difference in pressure signs. FC brass showed heavy bolt lift and ejector marks at 83 gr & 3734 fps where Peterson Long showed only slight ejector mark at 84 gr & 3835 fps
124HH: No significant velocity change, but difference in pressure signs. FC brass showed slight bolt lift resistance and ejector marks at 83 gr & 3874 fps where Peterson Long showed only slight ejector mark at 87 gr (full case) & 3989 fps
 
700 Sendero 1:10tw 26"
RL 16
R-P brass 4X FL sized
FM215
CBTO 2.960
COAL 3.639
Crimp 1/8
70.0 3093
71.0 skip
72.0 3152
73.0 skip
73.5 3220
74.0 3276 slight ejector stop Mr. Conservative!

H100V
R-P brass 4x FL sized
FM 215
CBTO 2.960
COAL 2.639
Crimp 1/8
74.0 3189
75.0 3259
75.5 3284
76.0 3292
76.5 3308 slight ejector stop Mr Conservative!

I think I have confirmed H4350 as Go To powder!!

This load was deemed safe in my rifle. Work up any load using safe standard reloading practices.

Edit added 4/1/23: all Hammer bullets are swirled in graphite powder at seating lubricant.
 
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