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160gr Matrix

 
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  #99  
Old 04-27-2013, 04:30 PM
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Re: 160gr Matrix

OAL. Base to ogive to lands= 2.606. Shooting these at 2.506. Coal is around 3.13
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  #100  
Old 04-27-2013, 04:36 PM
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Re: 160gr Matrix

This is at 53 grains and about 2900. Getting a little bit of pressure though. This is also 200 yards. .5moa.
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160gr Matrix-image.jpg  
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  #101  
Old 04-27-2013, 04:42 PM
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Re: 160gr Matrix

Hate that my pictures come out upside or side ways. So I guess the second picture is .5moa and I actually shot several groups at 1 moa or less and 3 at .5. Does that tell you they are good or does that not mean much?

I did not have time today test terminal ballistics. Sure knocked the crap out of the rocks tho. Lol
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  #102  
Old 04-29-2013, 06:31 PM
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Re: 160gr Matrix

I was disappointed today that my 6.5 SS chambering will be delayed for a couple of weeks as I wanted to shoot a "Bar" with the Matrix. I decided to pull the 6.5 Sherman out of mothballs and give it a try. I loaded up some worn out brass with Retumbo and BR2's in WW cases. This rifle has over 1500 rounds through it. I had a gusty crosswind around 25 mph and my rest is placed under a large fir tree which causes the cross hairs to move back and forth from the root movement when it's windy. Anyway, now that the excuses are covered, I fired three rounds with the bullets seated just into the lands. The results were rather disappointing (about 1 1/2" group). I tried another group jumping them about .030" with approx. the same results. Hmmmmm? Maybe this rifle doesn't like the 160's, or maybe worse, the barrel is going south? I remembered Cliff shooting his Sherman (posted earlier) with some pretty good results at about .090" off the lands so I thought it was worth a try. I fired away and presto; good looking group. I loaded up three more the same to see if it was an accident and fired again. Same result! I plan on going out again before long with some new brass and try tweaking the load to see if I can improve any. After that is determined, I want to shoot some at distance and maybe run an expansion test. I'll be anxious to see what some of you other guys find out. Here is a pic of the group. I was jumping the bullets between .080-.090". I didn't take a precise measurement......Rich160gr Matrix-dscf0540.jpg
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  #103  
Old 05-01-2013, 06:42 PM
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Re: 160gr Matrix

Thanks for the good info Brent, i just loaded up some rounds with retumbo in my 6.5x284, 5 at 50 grains (fouling shots, cleaned out copper last cleaning), 3 at 51, 51.5, 52, 52.5, and 53 grains seated .264" off the lands, i can seat farther out but .264" off the lands is 20 thou shorter than the MAX oal that i can eject a live round without pulling the bolt. I could seat out to an OAL of 3.397 and be at the lands but 3.153" is the longest i can eject a live round (the rounds i have loaded now are at 3.133 Base to tip.). Hopefully i can make it out to the range either this weekend or next.
Riley
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  #104  
Old 05-02-2013, 03:13 PM
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Re: 160gr Matrix

Sounds like your rifle has a very long throat. Is that correct?

3.397 vs 2.606 is .791. So 3/4 of inch difference in our rifles. I dunno I am kind of amazed by this. You could shoot 200 gr vlds out of that bad boy.

I hope your testing goes well. Right now I am planning to mountain shoot Saturday. We are working up some 260 rounds and I want to stretch the 160's out in the 284 at the same time. If I am not memory challenged again I will take a test target of wet newspapers and shoot for expansion. Looking forward to it.
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  #105  
Old 05-02-2013, 05:07 PM
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Re: 160gr Matrix

I am sure I missed it some where but what is the bearing surface of the 160? Wondering if there is a chance that we may see higher velocities than we think because of a shorter bearing surface, similar to how the 30 cal 215 vs 210 behave.

Scot E
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