270 Win and 165/175 Matrix Range Report

[FEENIX]

3 shots over a loaner chrono tonight averaged 2840 FPS. That's the 175 over 58 gr H1000 in a 24" McGowen tube.

You might want to consider bumping it with another chrono as I did. I pushing the 175 Matrix VLD at MV=2801 FPS and SD=FPS using 57.5 H1000, BR2, Win brass out of 30" Lilja barrel, 1:8, 3-groove @ ~3300 FT while fire-forming to .270 AI.

Just a thought.

Ed

 

[cowboyarcher]

I am getting light flattening of the WLR primer with no heavy bolt lift or sticky extraction.

The barrel is a 1:10 twist, 6 grove McGowen. Most will not be able to stabilize these bullets with a 1:10 due to altitude.

Feenix, what do you mean bumping with another chrono?

 

[FEENIX]

Feenix, what do you mean bumping with another chrono?

Compare with another chrono to validate the readings you're getting from the loaner chrono. My shooting chrony readings were 10-15 FPS slower than my friend's CED M2 chrony.

 

[cowboyarcher]

That sounds like good advice. Only issue is I had a had tough time getting just one chrono!

 

[270 MKV]

I can't go over 57.5 grains of H1000 without overly flattening primers and occationally getting some gas leakage around the primer. These loads the 165 Matrix at 2840.

I am starting to transition over to Retumbo for these loads...I can get some additional velocity...close to 2890 before I get into pressure signs.

H1000 is now the go to powder when using the Nosler LRAB in my rifle.

 

[cowboyarcher]

How long is your barrel? I could have a more spatious chamber too...

 

[270 MKV]

barrell is 27"

 

[FEENIX]

I can't go over 57.5 grains of H1000 without overly flattening primers and occationally getting some gas leakage around the primer. These loads the 165 Matrix at 2840.

I am starting to transition over to Retumbo for these loads...I can get some additional velocity...close to 2890 before I get into pressure signs.

H1000 is now the go to powder when using the Nosler LRAB in my rifle.

That's actually pretty good out of a 27". I was getting the following out of a 30" for 165 Matrix while fire-forming to .270 AI:

57.5 grains of H1000 = 2801 FPS (no pressure)
58.5 grains of H4831SC = 2981 FPS (no pressure)