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Reloading Techniques For Reloading


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H1000

 
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  #22  
Old 09-10-2013, 07:52 AM
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Join Date: Oct 2012
Location: Byron, GA
Posts: 71
Re: H1000

After extensive testing I discovered my jump in velocity was a combination of of two things, new brass and the powder lot change. I still have 25 to 30 fps with the new lot of H1000. Once fired brass seems to settle about 2800 fps where new brass shoots 2840 fps. My original load worked out to 2750 fps using Bergers Ballistic program to calculate drops.

All of my testing was done using Remington Brass, I plan to do some testing with new and once fired Bertram brass.

Randy
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  #23  
Old 09-10-2013, 08:19 AM
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Join Date: Dec 2012
Posts: 318
Re: H1000

I have been forming 7mag brass with h1000 all week. Velocity jumped 100fps from gm210m to cci250 verified by two chronos back to back then reversed.
I would expect new brass to expend a lot of the powders energy to expand. Meaning new brass velocity would be slower. However new win. brass 72gr h1000 cci250 168vldh was 3020/3024fps 24 in bbl. Thats pretty fast for that load.
Do you always see lower speed same load on once fired brass?
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  #24  
Old 09-10-2013, 09:02 AM
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Join Date: Jan 2008
Location: Northeast
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Re: H1000

Quote:
Originally Posted by tbrice23 View Post
I have been forming 7mag brass with h1000 all week. Velocity jumped 100fps from gm210m to cci250 verified by two chronos back to back then reversed.
I would expect new brass to expend a lot of the powders energy to expand. Meaning new brass velocity would be slower. However new win. brass 72gr h1000 cci250 168vldh was 3020/3024fps 24 in bbl. Thats pretty fast for that load.
Do you always see lower speed same load on once fired brass?
My experience with fired vs new brass and the effects on velocity is dependent on the rifle's chamber. I measure the case capacity between the two. If the capacity changes, the velocity can as well, all other as parameters of the load reminding constant. Generally, larger case capacity results in lower velocity under this circumstance. I have also found Winchester brass to be thinner in wall thickness which can pronounce the chamber/case capacity effects.
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  #25  
Old 09-10-2013, 09:49 AM
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Join Date: Dec 2012
Posts: 318
Re: H1000

I check outside dimensions in 4 places and headspace datum points on the shoulder all my brass between 1st and 2nd firings. Shoulders expand .018 to .020 on headspace and up to .005 diameter first fire form on belted cases.
That's a lot of expansion compared to non belted cases.
Since my last post I checked my notes from 1st to 2nd brass firing with the same load on my factory chamber 7mag Sendero I was surprised that the velocities were within 5-10 fps depending on the SD of the group. AND the temp. was 20 degrees difference and using Imr4350!
Only difference in in groups was once fired brass had less obvious fliers and maybe .01 tighter groups
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