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#5652244 - 03/15/15 02:19 PM 300 Win Mag velocities
DStroud Offline
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Registered: 11/02/11
Posts: 1651
Loc: Waco
Loaded up some 180 gr bullets in the 300 WM with various loads. Lowest velocity was around 2700 but I got my best accuracy with one max load that put 3 in one nice hole. I chronied two and they are running 3200+ which seemed fast but no signs of excessive pressures.
If they were running 3150 I would have never given it a second thought but now am curious as to what others are getting from 24-26 inch barrels with 180's.
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"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."

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#5652312 - 03/15/15 03:48 PM Re: 300 Win Mag velocities [Re: DStroud]
Gravytrain Offline
THF Celebrity

Registered: 01/06/11
Posts: 23904
Loc: Rowlett, Tx
I does sound fast, what's the powder and charge?

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#5652342 - 03/15/15 04:23 PM Re: 300 Win Mag velocities [Re: DStroud]
30378 Offline


Registered: 02/14/09
Posts: 2850
Loc: Deer Park, Tx.
If you are running 180s from a 24-26 over 3100, make sure your life insurance is paid up!!!!!
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#5652407 - 03/15/15 05:34 PM Re: 300 Win Mag velocities [Re: DStroud]
Beaubien Offline
Bird Dog

Registered: 02/18/15
Posts: 473
Loc: In the mountains east of ABQ
The fasted load on hodgdons website shows 3045 fps from a 24 inch barrel. If it is truly going that fast and your barrel is 24 inches then your load is hot. If you have a 26 inch barrel you might get another 100 fps out of it.

It is unusual for a hot load to shoot that well. Are you sure your chronograph is accurate?

What load are you using?
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#5652476 - 03/15/15 06:36 PM Re: 300 Win Mag velocities [Re: DStroud]
FiremanJG Offline
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Registered: 12/16/08
Posts: 22875
Loc: Wolfe City, TX
I'm betting this is a chronograph error.
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#5652534 - 03/15/15 07:08 PM Re: 300 Win Mag velocities [Re: FiremanJG]
dawaba Offline
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Registered: 10/22/06
Posts: 4200
Loc: Big Eddy Road, Noonday
I've worked up some loads with 180 gr Nosler PTs behind MRP that gave over 3100 fps, but for trouble-free hunting loads, I think a guy should back off to around 3000 fps. Bob Hagel has published several loads that meet that mark from a 24" barrel:

78/H4831/3156 fps
78/N205/3195
75/?4350/3140
78/MRP/3142
79/WW785/3108
76/IMR4831/3139


Ken Waters gets close, also a 24" barrel:

77/H4831/3095 fps

These guys were old school and did their load development by the now-defunct case head expansion method. This is largely frowned upon nowadays. Obviously, YMMV.


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#5652548 - 03/15/15 07:14 PM Re: 300 Win Mag velocities [Re: DStroud]
postoak Offline
Veteran Tracker

Registered: 08/19/09
Posts: 2905
Loc: The Woodlands, Tx
The .300 Win. Mag. is under-loaded from the factory given modern powders. Factory 150 velocity is 3290, but it is possible to hit 3500. Factory 180 gr. velocity is 2960 but it *is* possible to get 3100 fps.

http://reloadersnest.com/query_bw.asp?CaliberID=61&BulletWeight=180
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#5652619 - 03/15/15 07:48 PM Re: 300 Win Mag velocities [Re: postoak]
dawaba Offline
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Registered: 10/22/06
Posts: 4200
Loc: Big Eddy Road, Noonday
Frankly, I've found that it is easier to achieve 3000 fps with a 200 gr bullet than 3100 fps with a 180 gr pill, from 3 different rifles. But to repeat, I think a prudent shooter should back off around 100 fps for trouble-free hunting loads and good case life.
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#5652682 - 03/15/15 08:20 PM Re: 300 Win Mag velocities [Re: DStroud]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
My 300 Win Mag load with a 180 AB runs 3160 fps in a 26" barrel. It's a max load, and shoots lights out. So, 3200 is not far off. I ran a 190 SMK at 3050 for years.
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#5652749 - 03/15/15 08:52 PM Re: 300 Win Mag velocities [Re: DStroud]
DStroud Offline
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Registered: 11/02/11
Posts: 1651
Loc: Waco
Not completely ruling out Chrono error but the Magneto-speed has not failed me yet.

Load was 75gr of 4000 MR which is max load from Alliant website and Hornady shows max of 74.4 IIRC and both sources seem to be conservative normally.
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"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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#5652795 - 03/15/15 09:16 PM Re: 300 Win Mag velocities [Re: DStroud]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
The new line of Alliant Power Pro powders are freakin' awesome- 2000MR and 4000MR. They will yield higher speeds. So, I think you are at the powder max and getting the most fps you can. Just watch for sticky bolt lift and shiny spots on the case head.
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Custom and Precision Ammunition!!
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#5654350 - 03/16/15 09:32 PM Re: 300 Win Mag velocities [Re: DStroud]
DStroud Offline
Pro Tracker

Registered: 11/02/11
Posts: 1651
Loc: Waco
Went back again today just to double check speeds and see if accuracy was a fluke. Still no signs of pressure and these rounds were the same brass from before as I wanted to see if primer pockets were still tight.
Chrono


3 shots



Edited by DStroud (03/16/15 09:36 PM)
_________________________
"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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#5655788 - 03/17/15 09:03 PM Re: 300 Win Mag velocities [Re: DStroud]
Beaubien Offline
Bird Dog

Registered: 02/18/15
Posts: 473
Loc: In the mountains east of ABQ
Stick with it then. Can't beat the pattern.
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#5661570 - 03/21/15 08:49 AM Re: 300 Win Mag velocities [Re: DStroud]
DStroud Offline
Pro Tracker

Registered: 11/02/11
Posts: 1651
Loc: Waco
Impressed enough with the performance in this gun and it's doing well in the 6mm CM so I picked up 8 lbs of the 4000MR yesterday,

I Also grabbed 8 lbs of IMR4007SSC.......have used IMR4007SSC in the 6.5 Creedmoor prior to it being supposedly discontinued but tried it again in the newer AR in the 6.5 and it shot great but only had a little left.
_________________________
"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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#5661694 - 03/21/15 09:54 AM Re: 300 Win Mag velocities [Re: DStroud]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2968
where did you find the powder?

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