Hammer Hunter Load Data, (See page 1, Post 8)

[Hard rock]

I can't speak to that as we haven't gotten started on development for ours. Waiting on a barrel first. Hopefully someone can chime in.

I have a 3300 fps load on the 124s mag primers and 3450 fps with the 123 absolute mag primers and 3722 with cci200 and the 109 gr absolute . I will be loading and shooting this week with the 123 gr absolute and cci200 s with N560 . I'll keep everyone informed. That is really impressive on that 124 can't believe I've been leaving that much velocity on the table.

 

[whhood]

What is the coal on these cartridges? I have a short action mag that I'm thinking about building into a 6.5 PRC. I know they are limited on short actions though.

 

[Hard rock]

What is the coal on these cartridges? I have a short action mag that I'm thinking about building into a 6.5 PRC. I know they are limited on short actions though.

I'll post later I'm on the road but everything from the 131 gr too the 109 gr is less than 2.980 , about 2nd drive band I have one built on a long action and one on a short action.

 

[Northkill]

Here's what I had posted before on Steve's load for a Browning Hells Canyon:

Bertram brass
wlr primer
124HH
64g n560 (max load)
2.90 aol
3,470 fps

 

[DNADave]

Anyone know where to start for a 7mm Wby and the 146gr HH? My powder choices are RL-22, RL-25, and IMR 4831.

 

[GLTaylor]

Anyone know where to start for a 7mm Wby and the 146gr HH? My powder choices are RL-22, RL-25, and IMR 4831.

Check the Hammer Hunter load data. There's a load for 7mm Rem Mag and Rl 23. Start below and work up in your Wby.
Post results when done please.

 

[Dr. Vette]

Anyone know where to start for a 7mm Wby and the 146gr HH? My powder choices are RL-22, RL-25, and IMR 4831.

RL-22 is similar to the MRP I am testing.
I would start about 71 grains just like the Alliant data suggests, and work your way up.

 

[JTH]

Picked up a 300 PRC last weekend from Ryan Pierce (Piercision). Started load development today with the 199 Hammer Hunter. 24" Proof Research barrel with a 1/9" twist. Brake, but no can (yet, need another adapter). Using new ADG brass, Fed 215 large magnum primers, Vihtavouri N570 powder. Jumping 0.070, CBTO is 2.900, 3.593 COAL. Loaded up 3 rounds each at 1/2 grain increments starting at 80.0

80.0 grains was 2885 avg
80.5 grains was 2922 avg
81.0 grains was 2962 avg
81.5 grains was 3039 avg
82.0 grains was 3041 avg
82.5 grains was 3114 avg, with a very slight ejector mark on 1 of 3 rounds. Stopped here.

All loads were sub moa, the 81.5 and 82.0 grain loads were a very tight cloverleaf, sub 1/2 moa.

Was hoping to get closer to 3100, maybe when I get the can on it she'll pick up a little speed.

 

[codyadams]

Picked up a 300 PRC last weekend from Ryan Pierce (Piercision). Started load development today with the 199 Hammer Hunter. 24" Proof Research barrel with a 1/9" twist. Brake, but no can (yet, need another adapter). Using new ADG brass, Fed 215 large magnum primers, Vihtavouri N570 powder. Jumping 0.070, CBTO is 2.900, 3.593 COAL. Loaded up 3 rounds each at 1/2 grain increments starting at 80.0

80.0 grains was 2885 avg
80.5 grains was 2922 avg
81.0 grains was 2962 avg
81.5 grains was 3039 avg
82.0 grains was 3041 avg
82.5 grains was 3114 avg, with a very slight ejector mark on 1 of 3 rounds. Stopped here.

All loads were sub moa, the 81.5 and 82.0 grain loads were a very tight cloverleaf, sub 1/2 moa.

Was hoping to get closer to 3100, maybe when I get the can on it she'll pick up a little speed.

Significant node from 81.5 to 82 grains. A new tube should pick up a little speed, from what I have seen/heard, 20ish fps is usually gained with a can, not much but some, also shooting on chamber formed brass may change things a little too. When all is said and done I bet you will be close to 3100, probably just under?

 

[DNADave]

Got out to the range and tested two loads.

1) 146gr .284 HH 7mm Wby Mag. IMR 4831, CCI 250 primers, and 2.950" CBTO

67.0gr 2965fps
67.5gr 2977fps
68.0gr 3011fps
68.5gr 3028fps
69.0gr 3097fps
69.5gr 3135fps
70.0gr 3175fps
70.5gr 3233fps
71.0gr 3237fps
71.5gr 3256fps

Never found pressure.

2) 265gr .338 HH .340 Wby Mag. RL-22, Fed 215 primers, and 3.260" CBTO

83.0gr 2869fps
83.5gr 2876fps
84.0gr 2899fps
84.5gr 2920fps
85.0gr 2920fps
85.5gr 2931fps
86.0gr 2967fps
86.5gr 2986fps
87.0gr 2989fps
87.5gr 3016fps Sticky bolt

I'm thinking 70.7gr IMR 4831 for the 7mm Wby and 86.7gr RL-22 for the .340 Wby?

 

[Quintus]

I have been working up the 6.5 RPM with 121HH and RL26 with Federal 215M. Wasn't real sure where to start so went low at 61.0 Grains and finally found pressure at 68.0 grains with a fain extractor mark and 68.5 with a shiner. Primers never flattened out and no heavy bolt lift. I suspect this brass is just a little soft. velocity started at 3115 and topped out 3548. Speed increments were very even and predictable as the charge increased. They were also repeatable. I was hoping to reach 3500FPS with useable accuracy in the 3450 neighborhood. I loaded 3 rounds for the following
66.0 3367-3375
66.5 3420-3425
67.0 3459-3463
These were measured over a magneto speed sporter. Shooting time temps in the mid 30s. This is all still pretty meaningless. my barrel only has 90 rounds down it and it has all been new brass. I will shoot the next 10 and prep that 100 and play with this some more when it gets into the 40s and 50s, but I am pretty optimistic. The few groups I have shot without the magneto attached have been very very good considering who the nut behind the bolt is.

 

[Blackdirt Cowboy]

Got out to the range and tested two loads.

1) 146gr .284 HH 7mm Wby Mag. IMR 4831, CCI 250 primers, and 2.950" CBTO

67.0gr 2965fps
67.5gr 2977fps
68.0gr 3011fps
68.5gr 3028fps
69.0gr 3097fps
69.5gr 3135fps
70.0gr 3175fps
70.5gr 3233fps
71.0gr 3237fps
71.5gr 3256fps

Never found pressure.

2) 265gr .338 HH .340 Wby Mag. RL-22, Fed 215 primers, and 3.260" CBTO

83.0gr 2869fps
83.5gr 2876fps
84.0gr 2899fps
84.5gr 2920fps
85.0gr 2920fps
85.5gr 2931fps
86.0gr 2967fps
86.5gr 2986fps
87.0gr 2989fps
87.5gr 3016fps Sticky bolt

I'm thinking 70.7gr IMR 4831 for the 7mm Wby and 86.7gr RL-22 for the .340 Wby?

Keep going up on the 7mm Wby until you find pressure. I had one and was shooting 140 grain accubonds at 3400 FPS with no pressure.

 

[codyadams]

Keep going up on the 7mm Wby until you find pressure. I had one and was shooting 140 grain accubonds at 3400 FPS with no pressure.

I agree, I am shooting the 151 Cayuga from a 24" 7 rem mag and RL 26 @ 3390 and no pressure. I would hope the similar weight hammer in a 7 wb would break 3400 pretty easy. Keep goin!

 

[Dr. Vette]

Keep going up on the 7mm Wby until you find pressure. I had one and was shooting 140 grain accubonds at 3400 FPS with no pressure.

I would agree, though you may find in the 3300s you're good.
I was getting 3390-3440 last week and the primers were not looking happy, flowing back around the firing pin. Brass looked fine and no stiff bolt, but I'm going to back down to the 3300s and look for the next node. These speeds were faster than I shot the 131, which surprised me for using less powder.