TravOC
FNG
- Joined
- Feb 24, 2026
- Messages
- 2
Hey guys! My first post here and excited to share a range trip from the other day doing a pressure test with my Tikka T3x in 300 wsm using H4350 and StaBall 6.5 powders with the newish bullet 172gr HBC from Hammer. There isn't any published load data from hammer on this bullet yet, so for anyone interested in running it this upcoming season in their WSM hopefully this is a helpful starting place.
Rifle info:
Tikka t3x, Mcmillan mountain tracker stock, 24in proof carbon barrel with 1:9 twist, otter creek labs hydrogen K suppressor, UM tikka rings, Tract Toric 30mm Hunt scope, Hells canyon tikka mags with factory tikka bottom metal. With mag unloaded and can on, the gun weighs around 10 pounds.
Load info:
SAMMI chamber
Once fired ADG brass
Federal 215 magnum primers
H4350 + StaBall 6.5 powders
Hammer 0.308 cal 172gr HBC bullet. G7 BC: 0.272
COAL: 2.965in (0.040 off the lands)
Two PDR bands in the case neck for concentricity
Crimped with Lee crimp die
H4350 Results:
61gr: 2942fps
62gr: 2984fps
63gr: 3025fps
64gr: 3080fps
65gr: 3123fps
66gr: 3167fps
66.5gr: 3167fps light ejector swipe
67.0gr: 3207fps heavy extractor swipe + ejector swipe + stiff bolt lift
Overall group: 1.49in
Best 3 shots: 5, 6, 7 (65, 66, 66.5): 0.46in
StaBall 6.5 Results:
63gr: 2905fps
64gr: 2975fps
65gr: 3022fps
66gr: 3067fps light ejector swipe
67gr: 3116fps heavy ejector swipe + extractor swipe + stiff bolt
Overall group: 0.61in
Best 3 shots: 3, 4, 5: (65, 66, 67): 0.25in
Hope this is helpful, and for what its worth I shot 10 shot groups of 66.4gr of H4350 and 65.3gr of StaBall 6.5 at 300 yards and the data for each was about the same. Sizes were both around 0.88 MOA with similar ES and SD. Gunna move forward with H4350 since it's about 100 fps faster but gunna back down 0.5-1gr as I had a couple signs of pressure today with the warmer temps.
Rifle info:
Tikka t3x, Mcmillan mountain tracker stock, 24in proof carbon barrel with 1:9 twist, otter creek labs hydrogen K suppressor, UM tikka rings, Tract Toric 30mm Hunt scope, Hells canyon tikka mags with factory tikka bottom metal. With mag unloaded and can on, the gun weighs around 10 pounds.
Load info:
SAMMI chamber
Once fired ADG brass
Federal 215 magnum primers
H4350 + StaBall 6.5 powders
Hammer 0.308 cal 172gr HBC bullet. G7 BC: 0.272
COAL: 2.965in (0.040 off the lands)
Two PDR bands in the case neck for concentricity
Crimped with Lee crimp die
H4350 Results:
61gr: 2942fps
62gr: 2984fps
63gr: 3025fps
64gr: 3080fps
65gr: 3123fps
66gr: 3167fps
66.5gr: 3167fps light ejector swipe
67.0gr: 3207fps heavy extractor swipe + ejector swipe + stiff bolt lift
Overall group: 1.49in
Best 3 shots: 5, 6, 7 (65, 66, 66.5): 0.46in
StaBall 6.5 Results:
63gr: 2905fps
64gr: 2975fps
65gr: 3022fps
66gr: 3067fps light ejector swipe
67gr: 3116fps heavy ejector swipe + extractor swipe + stiff bolt
Overall group: 0.61in
Best 3 shots: 3, 4, 5: (65, 66, 67): 0.25in
Hope this is helpful, and for what its worth I shot 10 shot groups of 66.4gr of H4350 and 65.3gr of StaBall 6.5 at 300 yards and the data for each was about the same. Sizes were both around 0.88 MOA with similar ES and SD. Gunna move forward with H4350 since it's about 100 fps faster but gunna back down 0.5-1gr as I had a couple signs of pressure today with the warmer temps.
