Austin_Michael
Well-Known Member
Got a chance to shoot some quick ladder tests to establish max charges in my Valkyrie. Due to time constraints I was only able to shoot at 100 yards with limited rounds down range. I picked the 80 grain Berger VLD over Superformance and H414. I haven't seen much data in this thread for this bullet or these powders and I have a ton of them, so that's what I went with.
20" Larue with 1-7 twist
80 grain Berger VLD
COAL: 2.271"
CBTO: 1.777" (Jammed 5 thou)
CCI .41 Primer
New Federal Brass (H20 - 31.4 grs)
Fired Federal Brass (H20 - 32.0 grs)
Superformance: (grs / fps)
27.0 2310
27.4 2372
27.8 2440
28.2 2465
28.6 2520
29.0 2567
29.4 2621
H414: (grs / fps)
25.0 2385
25.4 2421
25.8 2470
26.2 2520
26.6 2560
27.0 2604
27.4 2656
Results:
I was surprised to see this much vertical spread on target at only 100 yards. Several of my bolt guns shoot ragged holes over a 2.0 grain spread at 100 yards and it's not until 300 yards that you see meaningful dispersion. Not sure why that is, but not really concerned with it.
It appears that with each powder there is a low and high node with a "scatter" in between. The "scatter" shot was exactly 2520 fps with both powders (coincidence, who knows!?) and the low node is between 2372-2470 fps, and the high node between 2560-2656 fps. I was also surprised by the linear increases in velocity, approximately 49 fps per 0.4grs of powder. I did not reach any pressure signs during these ladder tests, so I will explore slightly higher charges in the next round of testing.
So what does all this tell me... Avoid anything in the 2520 fps range, and H414 produces more velocity per grain of powder than Superformance (it's more efficient?). Neither of these powders are said to be temperature stable, so in the future I'll do some testing with other powders such as Varget, N540, 8208 XBR, BLc2 and AR-Comp. I know, some of those aren't temp stable either, but I'm curious... It's also nice having two nodes in two different powders that span about 100 fps each. That tells me this round should be very forgiving and stable if loaded to the middle of a node.
The next round of testing will consist of an OCW style test to better identify the high nodes. Most likely focusing on Superformance between 29.0-29.8grs (5 groups of 4 shots, 0.2gr increments). Then H414 between 26.6-27.8grs (7 groups of 3 shots, 0.2gr increments). As I mentioned I did not reach pressure max with either powder, so loading on the higher end will let me verify the outside edge of the node. If I reach pressure before then, I'll stop.
I did load some extra rounds for sighting in and fowling the barrel. The last picture is a decent group that makes me think this rifle has potential. Oh, by the way, I HATE FLIERS! (rifle will out shoot me every day!).
20" Larue with 1-7 twist
80 grain Berger VLD
COAL: 2.271"
CBTO: 1.777" (Jammed 5 thou)
CCI .41 Primer
New Federal Brass (H20 - 31.4 grs)
Fired Federal Brass (H20 - 32.0 grs)
Superformance: (grs / fps)
27.0 2310
27.4 2372
27.8 2440
28.2 2465
28.6 2520
29.0 2567
29.4 2621
H414: (grs / fps)
25.0 2385
25.4 2421
25.8 2470
26.2 2520
26.6 2560
27.0 2604
27.4 2656
Results:
I was surprised to see this much vertical spread on target at only 100 yards. Several of my bolt guns shoot ragged holes over a 2.0 grain spread at 100 yards and it's not until 300 yards that you see meaningful dispersion. Not sure why that is, but not really concerned with it.
It appears that with each powder there is a low and high node with a "scatter" in between. The "scatter" shot was exactly 2520 fps with both powders (coincidence, who knows!?) and the low node is between 2372-2470 fps, and the high node between 2560-2656 fps. I was also surprised by the linear increases in velocity, approximately 49 fps per 0.4grs of powder. I did not reach any pressure signs during these ladder tests, so I will explore slightly higher charges in the next round of testing.
So what does all this tell me... Avoid anything in the 2520 fps range, and H414 produces more velocity per grain of powder than Superformance (it's more efficient?). Neither of these powders are said to be temperature stable, so in the future I'll do some testing with other powders such as Varget, N540, 8208 XBR, BLc2 and AR-Comp. I know, some of those aren't temp stable either, but I'm curious... It's also nice having two nodes in two different powders that span about 100 fps each. That tells me this round should be very forgiving and stable if loaded to the middle of a node.
The next round of testing will consist of an OCW style test to better identify the high nodes. Most likely focusing on Superformance between 29.0-29.8grs (5 groups of 4 shots, 0.2gr increments). Then H414 between 26.6-27.8grs (7 groups of 3 shots, 0.2gr increments). As I mentioned I did not reach pressure max with either powder, so loading on the higher end will let me verify the outside edge of the node. If I reach pressure before then, I'll stop.
I did load some extra rounds for sighting in and fowling the barrel. The last picture is a decent group that makes me think this rifle has potential. Oh, by the way, I HATE FLIERS! (rifle will out shoot me every day!).
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