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270 Sherman

 
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  #29  
Old 03-02-2013, 10:03 PM
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Join Date: Dec 2008
Location: Northern Id.
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Re: 270 Sherman

Quote:
Originally Posted by bigngreen View Post
It looks like your going to comfortably run the 165 Matrix with your 22in barrel and the Sherman case about as fast as we run the 165 from a straight win with a 26in barrel humping it. That's fairly good ballistic performance when you think about it!!!
+1 on that!
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  #30  
Old 03-02-2013, 10:57 PM
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Join Date: Apr 2009
Location: Eastern Wheat Field, CO
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Re: 270 Sherman

Quote:
Originally Posted by CogburnR View Post
So far my loads have been pretty conservative. All were with the Matrix 165g and an OAL of 3.51" and a whopping 22" long barrel in 270 Sherman!

The 7828ssc 60g load shows about 2800fps. It does show some sign that the top is near. It shot 5 into just shy of an inch(just cleaned-.993").

The RL22 loads were continuing to gain speed but the hottest one at 59.5 grains showed 2715fps and no pressure. They did all shoot good and I loaded 5 rounds from 56g to 59.5 g and they all went into a group under an inch(.753").

The N560 loads showed some promise also but were low pressure and the hottest I loaded 56g was up to 2645fps. They also shot pretty well with 3 making a small group(.693") and the fourth of 4 being about an inch out.

Magpro again was fairly low pressure and was loaded from 58-62 grains. By this time I was getting cold and either wasn't shooting as well or the rifle doesn't like magpro but it threw one out about 1 1/4", two in close and the other two above a bit and spread out(1.217")

I would have liked to have seen some more speed at this point but it is obvious I underestimated the powder charges needed. Also, this was with BR2 primers and in cold temperatures. I may try some Magnum primers with the Magpro and increase top pressure loads until I find a stopping point. Right now none of the loads are HOT yet.

It was nice to see that the rifle will shoot a wide range of powder weight to a similar point of impact. The groups stating with the lower pressure loads moved up on the target with the higher pressure loads just as they should.

You could try some faster powder.
Some H 4831, RL 19 or Ramshot Hunter may work well for you.
I use Magpro and it really wants a longer barrel, like RL 25.
( There is a 26" on my 7 saum, 74 gr. capacity. )
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  #31  
Old 03-03-2013, 08:36 AM
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Join Date: Dec 2010
Location: SD
Posts: 377
Re: 270 Sherman

I am planning on trying more powders as time goes on, also I will be forming up some Winchester brass shortly.

Vihtavouri N560 may be good when I find some pressure with it.

H4831sc, RL19, RL17, Hybrid 100v, 3100 are all up to be tested.

This is an interesting burn rate chart...

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  #32  
Old 03-03-2013, 10:56 AM
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Location: Great Falls, MT
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Re: 270 Sherman

I agree with BNG!

I was getting 100+ FPS more using H4831SC over H1000 with the same amount of powder while fire-forming for my .270 AI.

160 FPS on 165 Matrix and 118 FPS on 175 Matrix (see My budget .270 AI ... #10).

Good luck!

Ed
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  #33  
Old 03-03-2013, 06:39 PM
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Join Date: Apr 2009
Location: Eastern Wheat Field, CO
Posts: 531
Re: 270 Sherman

Nice chart Cogburn!

Where did you find it?

Now I know why I like Varget so much...it's almost all by itself out there.
I'll have to try some 4320 to find out it's Vargetness.
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  #34  
Old 03-03-2013, 09:24 PM
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Join Date: Dec 2010
Location: SD
Posts: 377
Re: 270 Sherman

The chart came from Lapua. The one above is actually an older image from the web. This one has a few more powders like RL17,

http://www.lapua.com/upload/reloadin...echart2011.pdf

This target analyzer is cool also:

On Target Download

I loaded some more rounds, including some H4831sc. It is going to be crappy here for a couple days so I doubt I will do much if any range work.
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  #35  
Old 03-04-2013, 01:04 PM
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Join Date: Dec 2010
Location: SD
Posts: 377
Re: 270 Sherman

I formed up some more...these are Winchester brass.

I checked and they hold 75.5g of water.

Does anyone have QuickLoad and can run this case? I am thinking about buying Quick Load. I would like to see how it works.

130g Classic Hunters, 150g Berger VLD's and 165g Matrix VLD's are what I shoot.

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