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6-284 /107SMK/Ramshot Magnum-Results

 
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  #1  
Old 08-28-2010, 11:20 AM
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6-284 /107SMK/Ramshot Magnum-Results

I built up a 6-284 on a Savage target action and installed a 28" Shilen prefit barrel, put those in a Bell and Carlson Medalist stock(sorry no pics yet)

For load workups I loaded at the range with a load giving me 3250fps with the 107smk's,57gr Ramshot Magnum, and did a seating depth test. I used this velocity because I read it was a very accurate range for this cartridge.

After finding the best seating depth I did pressure workups.

I shot at each charge through the chrono until I reached 3450fps,61.5gr Ramshot Magnum , and still without any high pressure signs, but figured that was enough velocity.

I then worked backwards and shot loads of 2 more each through the chrono and watched for good ES. At the 3400 range, 60.5gr Ramshot Magnum I had a load that read 3392,3400,3395 fps.

Looked good to me so I loaded 3 more up and shot them at 565yds.

I also shot 3 rounds of 57gr to compare.

For the 57gr load, which by the way shot 3 shots into .25 at 100yds, shot a 5inch vertical at 565yds, with es being about 40fps.

Proving again that you need to shoot at long range to really see what a load does! Of course we all know that!

For the 60.5gr load:
Vertical was about 2 inches total, with 2 of the three shots being within one inch

I shot 12 more shots, for four -3shot groups.
The vertical was never more than 2 inches, and horizontal not more than 3 inches. A couple groups were 1.5"

As a note:

It seems like these charges are very high, but I noticed no difficult bolt lift, the Fed 210 primers all looked good, and the case web measured the same at 55grains -61.5grains., with no difference in expansion.
When I went back to reload the brass the primer pockets were still snug. I am using Lapua 6.5-284 brass necked down.
I was shooting in 95 degree heat with 90 percent humidity. Typical central FL summer.

Looks like a great load for my antelope hunt in a few of weeks.

The 6-284 with the 107smk's at 3400fps, looks awesome in the charts and has 1000ft.lbs energy at 800yds+/-. In fact not many rounds can stay with it as far as drop and drift.

Just will have to see how the 107 smk's perform on antelope!

Anyone with any exprerience with them please chime in.

Thanks

Last edited by RockZ; 08-28-2010 at 11:26 AM. Reason: spelling
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Old 08-28-2010, 11:34 AM
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Re: 6-284 /107SMK/Ramshot Magnum-Results

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Originally Posted by RockZ View Post
Just will have to see how the 107 smk's perform on antelope!

Anyone with any exprerience with them please chime in.

Thanks
The 107 SMK is the bullet of choice for my 6 br. My wife and I will be using on antelope out to 700 yards. I don't have any field reports for it on speed goats yet, but I did take a coyote with it. MV is 2775 and at 653 yards with the yote mostly straight on facing me. I put one in the front shoulder and it exited right under his tail with an exit hole of 1 1/2". Needless to say he dropped like he was lightning struck. I felt the exit proved expansion and I have no doubts with it for a well placed shot on a speed goat.

Jeff
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Old 08-28-2010, 11:40 AM
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Re: 6-284 /107SMK/Ramshot Magnum-Results

Jeff,
Thanks for the info.
The 107smk's should work great after hearing your results.
I am looking forward to giving this combo a try. I've mostly been working with the bigger rounds from 7wsm to 338 Lapua Improved.

Looks like the 6-284 can be awesome as far as ballistics and a light kicking round.
I'm very happy with the accuracy at the higher velocity as well.

I'm hunting in Wyoming from sep 25th -28th with Tyler Sims again and will let you all know how it goes.
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Old 08-28-2010, 11:54 AM
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Re: 6-284 /107SMK/Ramshot Magnum-Results

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Originally Posted by RockZ View Post
Jeff,
Thanks for the info.
The 107smk's should work great after hearing your results.
I am looking forward to giving this combo a try. I've mostly been working with the bigger rounds from 7wsm to 338 Lapua Improved.
My 6mm BR use to be a 6mm-284 with a 26" 10 twist Shaw barrel. I used it on deer and antelope and a ton of coyotes and PD's. With the 10 twist I was limited to smaller bullets. It hated anything above a 85 gr. I used the 85 SGK for deer and speed goats and 70 gr Sierra HPBT for yotes and prairie dogs. She would really bust a PD into pieces with a 70 gr hollow point at 4100 fps.

But I would not push it to hard if I were you. The 6mm-284 can wear out a troat pretty fast.

Jeff
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Old 08-28-2010, 12:00 PM
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Re: 6-284 /107SMK/Ramshot Magnum-Results

I've been taking it nice and slow. That's why only 3 shot groups.
I'm also going to treat it with Gun Juice and see how that works out.

So, how many rounds did you get through it when it was a 6-284? Right now I only have about 50.
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Old 08-28-2010, 08:57 PM
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Re: 6-284 /107SMK/Ramshot Magnum-Results

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Originally Posted by RockZ View Post
So, how many rounds did you get through it when it was a 6-284? Right now I only have about 50.
I built it to be fast, so the first barrel I loaded them that way... that barrel lasted 500 rounds and went from a .5 moa rifle to a 1.5 moa rifle. The second barrel was still shooting good at 500 but I took it off to go with a 8 twist for the bigger bullets and also opted for the 6br.

Jeff
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  #7  
Old 08-29-2010, 05:49 AM
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Re: 6-284 /107SMK/Ramshot Magnum-Results

The 6br is a great round, I've had one for a while.
I figured I needed to try a burner so I am enjoying the 6-284.
Hopefully gun juice wll help a little
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