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6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

 
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  #1  
Old 09-28-2012, 04:16 PM
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6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

Sorry, fat fingered the title. H4831sc. finally found a combo that is shooting good. h4831sc 51 gr f210. 140 berger hunting. 24" barrel. what do you think the fps is?
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Old 09-28-2012, 11:08 PM
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Re: 6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

You know your about 5 gns over what hornadays Max is so I would say around 2800 to 2850 or more.

They say Max is 45.9?????
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Old 09-28-2012, 11:34 PM
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Re: 6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

I noticed the same thing when reading up on the cartridge prior to buying mine.

None of my manuals agree on the maximum powder charge. They vary by about 5 grains. So, I went off the 284 Winchester data with the same bullet weight, and the results were much more comparable. Most of my manuals don't even list the 6.5-284 cartidge. Alot of the guys that are shooting competition are shooting more powder than the books say they should.

I am shooting way more powder than the books say to get 2975'/sec with the same load out of a 26" tube..............54.5 grns H4831sc. Didn't start seeing any ejector flow until 56 grns powder! 54.5 was the best group of anything from 51 to 56 grns, and I can neck size the brass.......it's not so hot that it has to be FL sized every firing. Differences in bores and chambers and throats apparently.???

3000'/sec is expected out of this cartridge with 26" barrels or longer as far as I've been able to research. When I watched David Tubb shoot it at a mile (on video) he mentioned he was getting 3000' / sec. The Hodgdons data for the 140 says max is only 2700 something. ??
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6.5 x 284 h4821sc 51 gr. 140vdl. velocity?-140vld-100-yds.jpg   6.5 x 284 h4821sc 51 gr. 140vdl. velocity?-6.5-284-200-yds.jpg  

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Old 09-29-2012, 07:28 AM
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Re: 6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

I ran SBruce's load in QuickLoad and get a match with his 26" barrel.
Then I run 'what-ifs' for the same resulting pressure(60Kpsi):
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6.5 x 284 h4821sc 51 gr. 140vdl. velocity?-6.5x284sbruce.jpg  
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Old 09-29-2012, 07:46 AM
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Re: 6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

Guess I should atleast try to answer OP's question!
~2730fps and only 49.1Kpsi

Your barrel is too short for this cartridge, and even with 3.5gr less powder than SBruce, your muzzle pressures are higher than his.
Your case fill is only ~90%
With this, the powder and the short barrel, I would expect high extreme spreads.
You did not say if your bullets are touching the lands. This would bump up the velocity from 2730.
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Old 09-29-2012, 02:42 PM
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Re: 6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

Hey Mike, thanks for the chart.

Assuming the cartridge is rated at 60K psi MAX.??

Same load shot today at 700 yds for the first time. Wind 0-2 mph from the right.

OP, do you have a chronograph? I just use a cheap Chrony and verify velocity is about where I want it once I find the most accurate and consistant powder charge. You can probably get one for about 100 bucks. This load I am shooting was only chrono'd - 5 shots worth, but drops are really close to right on with the ballistic program, so it's gotta be accurate enough.
Attached Thumbnails - Click to View Larger
6.5 x 284 h4821sc 51 gr. 140vdl. velocity?-700-yds_-6.5-284-140-berger-vld.jpg  
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  #7  
Old 09-29-2012, 02:54 PM
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Re: 6.5 x 284 h4821sc 51 gr. 140vdl. velocity?

SBruce QL lists MAX(often SAAMI) for the 6.5x284 at 59.5kpsi and your load is there.
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