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Discussion Starter · #1 ·
Date of test: June 30, 2008

Wind: 3 mph

Distance to F1 Chrono: 8 feet

Firearm used: Ruger SBH 4 5/8ths .44 Magnum

Table Top Bench Rest was used for support.

Test: 6 rounds were tested of each loading, the F1 Chrony sheet calls for 10 to get the over all average but I only shot 6 of each getting the lowest, and then the highest FPS of each of the loads, I still need to figure the average FPS of these loads tested.

Each load had been digitally weighed on the Frankford Arsenal 700 gr scale.

305-gr WFN GC, CCI #300 LPP with positive crimp

20.0 gr of H110

1) 1239 fps
2) 1214 fps L
3) 1239 fps
4) 1222 fps
5) 1234 fps
6) 1250 fps H

20.5 gr of H110

1) 1292 fps H
2) 1233 fps
3) 1260 fps
4) 1229 fps L
5) 1254 fps
6) 1232 fps

21.0 gr of H110

1) 1298 fps H
2) 1273 fps L
3) 1288 fps
4) 1282 fps
5) 1297 fps
6) 1290 fps

Firearm Used: Marlin 1895G

I also shot 4 rounds of 45-70 using a 430-gr WFN GC, Federal LMRP with positive crimp.

46.0 gr of IMR 3031

1) 1700 fps L
2) 1703 fps
3) 1714 fps
4) 1725 fps H


As you can see one or two extra curnals of powder can cause deviation even using a digital scale. With the .44 Magnum loadings I believe that 20.0 gr of H110 is plenty, and showed pretty much what I expected with lower FPS. 21.0 gr of H110 powder gives good FPS behind that 305-gr WFN GC Rim Rock Bullet, and with the 430-gr WFN GC for the 45-70 the FPS obtained is plenty to take down the biggest of our Montana critters.

More testing will follow at another date and time.
 

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need to get one one of these years..............

most published data is just a round house estimate as there are too many individual variables for the shooter such as bullets, barrel length, etc.

Might be an eye-opener to see what really is goin' on............could really bust my bubble livin' in ignorance all these years..... :lol:
 

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Discussion Starter · #4 ·
Further math on settled loads:

For the .44mag:
SD: .24
Load: 20.0 gr H110
Avg FPS: 1233
TKV: 23.05
ME: 1029.42 Ft/Lbs

SD: .24
Load: 21.0 gr H110
avg is 1288 fps
TKV 24.08
ME: 1123.31

The 45-70:
SD: .29
Load: 46.0 gr IMR 3031
Avg FPS: 1710.5
TKV: 48.12
ME: 2793.08 Ft/Lbs

Looks like I can kill anything MT throws at me!
 
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