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Pressure signs
#6046483
11/24/15 03:14 AM
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Joined: Nov 2010
Posts: 971
P & Y
OP
Tracker
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OP
Tracker
Joined: Nov 2010
Posts: 971 |
I'm working on some loads for a 6.5 creed with the 130gr VLD and H4350. while working up I started getting flattened primers at 40.8 grains. It shoots decent but I'm seeing velocities in the 2600 range which isn't going to cut it. Would it be wise to just keep going up until I see substantial ejector swipes or sticky bolt lift, then back off? I know most guys are running somewhere around 43-44gr but was a little leery to keep going.
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Re: Pressure signs
[Re: P & Y]
#6046583
11/24/15 04:02 AM
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Joined: Nov 2011
Posts: 3,637
DStroud
Extreme Tracker
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Extreme Tracker
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Posts: 3,637 |
Flattened primers may or may not mean excessive pressure. I would ease on up watching for all the things you mentioned.
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."
Jack O'Connor 1963
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Re: Pressure signs
[Re: DStroud]
#6046636
11/24/15 04:45 AM
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Joined: Sep 2006
Posts: 32,498
kmon11
junior
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junior
Joined: Sep 2006
Posts: 32,498 |
Flattened primers may or may not mean excessive pressure. I would ease on up watching for all the things you mentioned. Yup what he said
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: Pressure signs
[Re: P & Y]
#6046926
11/24/15 02:00 PM
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Joined: Mar 2014
Posts: 243
300_WizzM
Woodsman
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Woodsman
Joined: Mar 2014
Posts: 243 |
You can also lower the pressure by seating bullet further off the lands.
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Re: Pressure signs
[Re: 300_WizzM]
#6046958
11/24/15 02:12 PM
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Joined: Oct 2004
Posts: 39,542
redchevy
THF Celebrity
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THF Celebrity
Joined: Oct 2004
Posts: 39,542 |
You can also lower the pressure by seating bullet further off the lands. Which way is it I also hear a lot of people say you lower pressure seating bullet further out, creating a larger case volume and lower pressure.
It's hell eatin em live
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Re: Pressure signs
[Re: P & Y]
#6046992
11/24/15 02:25 PM
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Joined: Mar 2014
Posts: 243
300_WizzM
Woodsman
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Woodsman
Joined: Mar 2014
Posts: 243 |
It has been my experience that you get lower pressures off the lands. One of the reason I will not jam bullets into lands while working up.
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Re: Pressure signs
[Re: P & Y]
#6047077
11/24/15 03:03 PM
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Joined: Nov 2010
Posts: 971
P & Y
OP
Tracker
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OP
Tracker
Joined: Nov 2010
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I'm seated .090 off right now. Thats about as close as I can get them and still fit and feed reliably.
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Re: Pressure signs
[Re: P & Y]
#6047129
11/24/15 03:28 PM
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Joined: Nov 2007
Posts: 9,521
RiverRider
THF Trophy Hunter
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THF Trophy Hunter
Joined: Nov 2007
Posts: 9,521 |
You will increase pressure seating deeper once you go for deep enough, but you'd have to decrease the powder space quite a bit to see it happen. Both factors operate simultaneously.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Pressure signs
[Re: P & Y]
#6047295
11/24/15 04:57 PM
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Joined: Sep 2009
Posts: 18,951
ChadTRG42
THF Celebrity
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The 2 signs of pressure I watch for are sticky bolt lift and shiny spots on the case head. Primers will flatten out or protrude at the firing pin strike very easily even with mild loads. So, I do not watch for those signs.
With a 130 grain, you should be running about 2850, maybe 2900. Even at 40.8, you are below max charge with a 140 grain, so keep on going up.
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Re: Pressure signs
[Re: P & Y]
#6060174
12/01/15 03:17 PM
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Joined: Apr 2015
Posts: 610
JTPinTX
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Tracker
Joined: Apr 2015
Posts: 610 |
I agree with Chad. That is nowhere near close on an "average" Creedmoor. Of course that depends some on barrel length too, what length is your barrel? I love my Creed and have shot all bullet weights extensively using H-4350.
One thing I will say, the downfall of the Creed is the brass. Hornady brass is what I use, and it is kind of soft. If you get your loads too hot you will start blowing primer pockets pretty easy compared to harder brass. In my rifle the high node for 130's was a bit hot, and I wasn't getting the brass life I wanted. With either the 140 class or 123 SMK the high node peaked a bit lower, and was much better for brass life.
I am running a 140 at 2725 (42.3 grains H-4350) in a barrel that has been chopped to 22", with good brass life.
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