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A bit of load testing .308 win

 
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  #8  
Old 02-23-2010, 08:52 PM
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Join Date: Feb 2010
Location: Alaska
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Re: A bit of load testing .308 win

Looks like your at the lower end of OCW for the 155 MK........the upper end should be close to 47.0 grains of Varget.

I noticed Varget prefers CCI Br2 primers. I use WW brass.

Good choice of Powder for the 308 Win.

Don't forget IMR 4895 another outstanding powder with 155 gr in 308 win.

If your using WW brass I suggest around 47.0 with Varget using 150/155gr in the 308 Win.

Last edited by alaska; 03-08-2010 at 06:38 PM.
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  #9  
Old 03-07-2010, 02:22 PM
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Re: A bit of load testing .308 win

Just an update...

I had the chance to crono some loads today..>>

46 grns Varget/155 Amax was producing an Av velocity of 2870fps from virgin Lapua brass/BR2 primers/26" tube.

The same load with 155 Scenars was 2896fps.......155.5 Berger VLD was 2838fps

Of all the loads i shot today 155 Amax are still the best and producing bughole groups...followed a close second were the Berger 155.5`s...

I am hoping this load will become more consistant with a lower ES ( 60fps today )when I reload the once fired brass.

I may switch back to the Federal GM match primers ..

Any body else find high ES in there velocity spread with virgin brass ?
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  #10  
Old 03-07-2010, 11:10 PM
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Re: A bit of load testing .308 win

There's a sticky at the top of the reloading forum (this one) that has links to two Excel spreadsheets that I built. One of them will let you input 10 velocity data points and it will calculate Low, High, Average, ES, Energy, and SD for the string.

For instance- using the velocities from your first group-

Low = 2,705
High = 2,758
Average = 2,723
ES = 53
Energy = 2,767
SD = 15.54

Quote:
Originally Posted by Varmartin View Post
2.810 is 0.110` from the lands, brass is 2x fired Lapua


Failed to getthe SD from the crono before it was packed away ,but did write down the velocities as i went ...

SAAMI load 2.810 to bullet tip
2721
2709
2737
2716
2720
2712
2730
2722
2705
2758

0.015 off the lands @ 2.280 to the ogive

2723
2738
2742
2717
2766
2717
2725
2749
2752
2738
2775
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  #11  
Old 03-08-2010, 06:42 PM
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47.0 Varget and 308 Win

I suggest 47.0 of Vaget using 155gr and WW brass.......with Varget I have had best results with CCI br2 primers.

Lapua is excellent brass but WW brass I beleve has more capacity.
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  #12  
Old 03-09-2010, 02:07 AM
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Re: A bit of load testing .308 win

Thanks for the replies fellas, I willreport back when I have loaded another batch. ;)
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  #13  
Old 03-09-2010, 06:53 AM
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Re: A bit of load testing .308 win

ive found 45.6gr AR2206H (H4895) = 2950fps and very tight 1 hole groups using 155gr VLDs...

ES is a tad high @ 30fps, but im still tweakin it...
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  #14  
Old 03-09-2010, 07:20 PM
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Re: A bit of load testing .308 win

In the 308 Win for years back in the 80's and 90's Palma Match IMR 4895 was the powder to beat. The new then Reloader 15 was a contender....

Still a excellent powder for the 308 win

1992 Palma records - IMR4895 was the powder of choice for most folks. Charge weights varied from
44.3 to 45 grains with the 155 MK. Some folks threw charges direct from measures; others
weighed every charge to a +/- .05-gr. spread. Interestingly enough, the
powder lots had varying degrees of fouling. That's not surprising as IMR4895
is one of the `dirtier' powders on the market. Most folks didn't clean their
barrels during the day on the range. Others drybrushed after each, or every
other 15- or 20-shot stage. Many of the top scores were shot using IMR4895.

A good load is IMR 4895 @ 43.6 with 168 Sierra MK and Fed 210M in FC brass. This will duplicate the Federal Gold Medal Match load @ 2600 FPS.

Last edited by alaska; 03-09-2010 at 07:30 PM.
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