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7mm 175g gamekings

 
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  #1  
Old 10-18-2006, 09:46 AM
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7mm 175g gamekings

Hey all, I decided on buying some 175g gamekings for my 7mm RM. Hopefully they'll shoot alright. Anyone shoot these? I'm hoping for 2850-2900fps out of my 24" tube along with .5" accuracy. I have RL-22 and Retumbo right now. My rifle is currently getting a holland brake so will be working up these bullets when I get it back. Elk season starts nov. 4th. I dont have to much time to work up a load and get a good drop chart, so I hope I find a good load on the 1st trip out. Thanks.
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Old 10-18-2006, 01:15 PM
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Re: 7mm 175g gamekings

Its 17 years since I had a Rem 700 Classic in 7mmRM, and back then Reloader 22 wasn't available in Oz, and ADI hadn't made AR2225 (HRetumbo in US).

I found that the 2 standout powders with the 175 grain Sierra were IMR7828, and H870.

MY experience is that the burning rates of IMR 7828 and Re 22 are similar, but personally I believe HRetumbo has a burning rate that is much better suited to the 175 grain bullet than Re22, and will give a much better loading density as well. My chrono data from back then:
Rem cases, Fed 215 primer.

77.0 grains H870 - 2901
78.0 grains H870 - 2977 (Max)

65.0 grains IMR 7828 - 2,740
66.0 grains IMR 7828 - 2,808
67.0 grains IMR 7828 - 2,883 (Max)

I note on the Hodgdon website that they list 77.0 grains of H870 as maximum, but only list a velocity of 2,782 fps. Obviously a much slower lot than I was using. They list 77.0 grains of US 869 as producing 2,758, which in my opinion is a pretty low velocity for what is achievable in a 7mmRM.

I note that Hodgdon list 68.0 grains of HRetumbo as maximum and producing 2,800 fps, which again seems very conservative to me. Only last week when testing both AR2225, and H870 in my 257Weatheby with the 156 grain bullet, the maximum load for AR2225 was 65.0 grains, and 70.0 grains for H870. I noticed the same 5 gain differential between these 2 powders in my 25/06AI.

My suggestion is to start at 65.0 grains of HRetumbo and work up from there, and would be interested to hear what your maximum load turns out to be. Good luck, Brian.
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Old 10-18-2006, 07:15 PM
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Re: 7mm 175g gamekings

That bullet is one of the best shooting out of my 7mm saum. I have'nt killed anything with them but groundhogs. I'm loading four grains under max and get 2807 f.p.s. avg. I'm taking that rifle /load hunting this year.
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Old 10-18-2006, 07:30 PM
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Re: 7mm 175g gamekings

What kind of BC does this bullet have?
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Old 10-19-2006, 09:05 AM
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Re: 7mm 175g gamekings

I shoot the 175 SMK in my 7RM using 67.5gr of RL-25. Speed is near 3000fps, but this is with a 26" Broughton barrel.
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Old 10-19-2006, 10:03 AM
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Re: 7mm 175g gamekings

Sierra says its .530 or so, but it gets a little higher as the velocity drops. Its up to .560 under 2000fps. Its got a pretty high BC for a hunting bullet. Sierras are usually always accurate bullets. Now my only problem is pushing them fast enough in my 24" tube to see the potential of them. Even if I get them to 2850fps, I still have over 1000ft lbs at 850 yards. Plenty for elk in my opinion.
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Old 10-19-2006, 01:02 PM
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Re: 7mm 175g gamekings

Dan B from Sieera web site:
.533 @ 2500 fps and above
.538 between 2500 and 2000 fps
.560 @ 2000 fps and below
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