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Campfire Outfitter
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OP
Campfire Outfitter
Joined: Jan 2010
Posts: 13,189 Likes: 1 |
I just chronoed a load from my Vanguard Back Country .30-06, 24" barrel. 180 Partition, 59.0 gr Hunter, WLRM, Rem brass, 3.339" OAL. I've never chronoed this load in this rifle before. Overcast, 5:30 pm, but direct view of the sky, unit 15' from the muzzle. No skyscreen. Alpha Master model Shooting Chrony.
3 shots, average 2918, ES 40. Wait, that's not right. I changed batteries and tried again.
3 shots, average 2908, ES 12.
Add the two strings together keeps the same ES, average 2913.
I need to try again in brighter light maybe? I'm nowhere near the lands at 3.339". Or could this be accurate? I'm 80 fps over Nosler #7 velocity at the same charge.
P
Obey lawful commands. Video interactions. Hold bad cops accountable. Problem solved.
~Molɔ̀ːn Labé Skýla~
Member #547 Join date 3/09/2001
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Joined: Sep 2010
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Campfire Ranger
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Campfire Ranger
Joined: Sep 2010
Posts: 19,179 |
Pharm -
My O 33 was not designed to use diffusers. I have a new set of SK III and it will use the diffusers or not.
I always graphed in SHADE or cloudy WX when possible.
I wouldn't doubt your reading because of WX or time of day.
Jerry
Last edited by jwall; 05/23/16.
jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,006 Likes: 1 |
PS
Cloudy days are better then bright days.
Remington brass is usually on the thick side, and you are using a hotter primer than the book,
Two strings, essentially the same results.
I see no reason to doubt them.
Last edited by antelope_sniper; 05/23/16.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Jan 2007
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
30-odd years ago Bob Hagel was getting 2900+ from the 30/06 -180 and MRP, from the 24" barrel of a Weatherby Vanguard.
Possible? Sure.
Too hot? I dunno.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Jan 2010
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Campfire Outfitter
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OP
Campfire Outfitter
Joined: Jan 2010
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Thanks for the reply.
The same load chronoed 2900 in another Back Country. I might be right on.
P
Obey lawful commands. Video interactions. Hold bad cops accountable. Problem solved.
~Molɔ̀ːn Labé Skýla~
Member #547 Join date 3/09/2001
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Joined: Feb 2007
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Campfire Tracker
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Campfire Tracker
Joined: Feb 2007
Posts: 7,439 |
Damn, that's what I got Saturday afternoon with a new to me 300 win...around 2900 fps with 180 grain bullets with max loads. Second 300 win I've had with a sloooow barrel.
Jealous
You only live once, but...if you do it right, once is enough.
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Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,161 Likes: 13 |
In my experience light-screen chronographs (and in particular Shooting Chronys) are more accurate under cloudy skies.
Ramshot's data lists a maximum velocity of 2869 fps with one 180-grain bullet, the Hornady SST, using 60.5 grains of Hunter, at slightly over 59,000 PSI. That's from their 24" piezo test barrel.
Unfortunately, while they tested Hunter with a bunch of different 180's, they didn't test the Partition. But Partitions do tend to result in a little more pressure than average, and 2900+ doesn't surprise me, since I've seen it more than once from 24" barrels and 180's with Hunter. The pressure probably is a little more than 59,000, but so what? The only reason the .30-06's maximum SAAMI average pressure is 60,000 is really old rifles. In a modern rifle 65,000 PSI (the MAP of the .270 Winchester, among many others) isn't a problem.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Campfire Outfitter
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Campfire Outfitter
Joined: May 2014
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I prefer classic. Semper Fi I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally
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Joined: Sep 2010
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Campfire Ranger
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Campfire Ranger
Joined: Sep 2010
Posts: 19,179 |
Yep Bugger, I remember telling you that I had seen 'here', on the fire, loads for 180s @ 2900 fps. IIRC this the second thread discussing it. Glad you found it. Jerry
jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Apr 2004
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Duplicates what I got out of several of my 06s, with another powder and 180s... H4831SC.
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Campfire Tracker
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Campfire Tracker
Joined: Dec 2012
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Have any of y'all used this? Do you think it might help solve the light issue? http://www.btibrands.com/product/ballistic-precision-chronograph-g2/
"An archer sees how far he can be from a target and still hit it, a bowhunter sees how close he can get before he shoots." It is certainly easy to use that same line of thinking with firearms. -- Unknown
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Joined: Sep 2010
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Campfire Ranger
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Campfire Ranger
Joined: Sep 2010
Posts: 19,179 |
Hey Rev.
I'm not being critical. I didn't know anything about diffusers for many years and I didn't have any problems.
I graphed in the shade OR when cloudy whenever possible. I don't why there would/should be a problem now. I know we can't always graph in cloudy WX or shade so some would have to deal with that.
I got new Sky Screen IIIs and they are designed to use diffusers (or not) and so far I've used it with & without the diffusers and still no problems.
Jerry
jwall- *** 3100 guy***
A Flat Trajectory is Never a Handicap
Speed is Trajectory's Friend !!
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Joined: Dec 2012
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Campfire Tracker
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Campfire Tracker
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Thanks. I gotta seriously look into getting one.
"An archer sees how far he can be from a target and still hit it, a bowhunter sees how close he can get before he shoots." It is certainly easy to use that same line of thinking with firearms. -- Unknown
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