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7mm RM and loads using 175 SMKs

 
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  #1  
Old 03-22-2005, 07:16 AM
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Location: Connellsville, PA
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7mm RM and loads using 175 SMKs

I'm getting ready to start putting together loads for my new 7mm RM. I picked up a box of the 175 SMKs and plan to start with RL-22. Any other powders you guys have had luck with when shooting this bullet? I've also got RL-25, but wondering if it might be too slow.

Also, I don't see many guys shooting this bullet. Any particular reason? Should I be looking more closely at the lighter A-Max or Accubond?
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Old 03-22-2005, 09:58 AM
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Re: 7mm RM and loads using 175 SMKs

I don't know what twist your barrel has but mine is a 1 in 9.5 and it is just not quite fast enough to stabilize anything over the 150-160 range. Hope this helps. Only time and a little burnt powder will tell.
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I shoot 1/4 inch groups at a 1000 yards. That is...till my second shot.
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Old 03-22-2005, 02:25 PM
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Location: Long Island, New York
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7mm Twist rate

My 7STW has a Hart 10" twist barrel. I was a little skeptical about its ability to stabilize the looong 162gr A-Max bullet until this weekend. I had no problem shooting .5moa @ 200yds.

However, those long ***** A-Max's will not fit in the magazine when the bullets are loaded out to engage the rifling. The Sierra MK's will fit in the magazine when loaded out to engage the rifling.

Still looking for the perfect antelope bullet for the often windy conditions of Wyoming. [img]/ubbthreads/images/graemlins/cool.gif[/img]

VH
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Old 03-22-2005, 07:12 PM
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Re: 7mm RM and loads using 175 SMKs

I use 140 gr spitzer(sierra) and 139gr BTSP(hornady) with short cut 4831. Both lit with 210m. I find that this gun likes 64 gr. This is a 26" 1:10 off the shelf winnie. If I were playing with 175's, I'd use my 300 RUM.
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Old 03-24-2005, 12:18 AM
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Re: 7mm RM and loads using 175 SMKs

Craigp40, I owned a Rem 700 classic in 7mmRM in the mid 80's, so naturally I didn't have the opportunity to use the Sierra 175 MK. However, I did chronograph and test the 175 Sierra GameKing, as well as the 120 & 140 Nosler BT's.

Judging from my results, I am sure that Re 25 will be not be too slowburning for use with the 175 grain bullet.

Using Remington cases, I found that to fill the case to the base of the neck, it took about 76.0 grains of a long cut extruded powder such as IMR 7828, and 83.5 grains of ball powder such as H870. I estimate that a short cut extruded powder such as Re 25 would have occupied about 78 - 79 grains. My chrono results with the 175 MK,Rem cases, Fed 215 primer, were:
65.0 grains IMR 7828 - 2740 fps
66.0 grains IMR 7828 - 2808 "
67.0 grains IMR 7828 - 2883 " (Max)

76.0 grains H870 - 2841 fps
77.0 grains H870 - 2901 fps
78.0 grains H870 - 2977 fps (Max)

Generally most people tend to use the 140/150 grain bullets for medium game, and use the 175 grain bullets for larger game. I have not heard how the 175 grain MK performs in the field. Regards,Brian.
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Old 03-24-2005, 07:04 AM
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Re: 7mm RM and loads using 175 SMKs

Thanks for the input guys. The rifle I'm having built will have a 1 in 9 twist, so I'm hoping it won't be a problem. Primary reason I'm choosing this bullet is its high BC for the longer range stuff out to 1000yds (steel plates at 1000 and PA deer 500-700). Could possibly use it on elk someday, but not in the near future. However, I have a 300RUM to fill that ticket if needed. I have been reading that most guys are really liking the RL-22 and H4831 for this cartridge. Not sure if you guys have seen the 175 SMKs, but I sure was impressed. No wonder that bullet has such a high BC.
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Old 03-24-2005, 09:29 PM
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Re: 7mm RM and loads using 175 SMKs

i think a 9.5" twist is adequate depending on climate.. i live in WV and have shot a few out of a stock sendero 7SAUM however so far the 162 Amax is outshooting it... i will be trying the 175SMK in dad's 7ultra sendero and maybe his 9"twist custom 7rem mag but not for a couple more weeks....
Brien
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