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7x57 Cold Weather Powders?

24 May 2017
@ 04:20 am (GMT)

James Knight

What is the coldest temperatures in which you either (a) used your load in cold temps or (b) tested your loads at the Range? I have used, in other rounds, H4350, R15, WW760, R19, H4831, R22, H322 and a few others. the H4350/H4831/R15 were the "best" ( meaning no significant change in velocity nor zero) and R19/WW760 were the worst. ( meaning the 760 lost around 80+ fps but R19 loast over 200fps, this was in a 375 H&H and 338 Winmag respectively.
I plan on a cold Weather Late Season cow elk hunt here in Utah ( or a hog hunt in MO in the late winter) with my new to me Mod 700 classic in 7mm Mauser (7x57) I haven't worked up a load yet, been gathering up components as rife is being pillar bedded, Timney Trigger added, etc.
Any reports on the 7x57 specifically and similar sized round generally in cold temps? Thanks gentleman. Rev Jim Knight


24 May 2017
@ 07:35 am (GMT)

Nathan Foster

Re: 7x57 Cold Weather Powders?
Hi Jim, both Varget (ADI 2208) and H4350 (ADI 2209) are fine. I have used both in the snow.

If you are dealing with extremely low temps (particularly for readers in Canada or Alaska), one could if needed, use a magnum primer with H4350 in the 7x57. The case to bore ratio suits this combo and resulting burn rate quite well.

Hope that helps.
24 May 2017
@ 01:35 pm (GMT)

Bryan Webster

Re: 7x57 Cold Weather Powders?
As Nthan advised.

To add, here is my load used in the 7x57 for wolf shooting. On one shot a year ago in -30 Centegrade I got a wolf at 625 yards with it. Works wonders on bigger game as well.

PPU Brass necked down from 8x57 brass, neck turned, fireformed, annealed, trimmend to length.
H4350 44.6 grains
162 grain Hornady A-max seated to 3.000"

They shot sub half inch groups from -20 to -30 and half inch groups in warmer weather like plus 27 degrees.

You should work your way up from a load below book maximum that I think is this load. When I was doing the load work I tested rounds up to a load of 48 grains before dropping back down to this one so the rounds could be usedin warmer weather, then shot groups out to 500 yards to calibrate my trajectory for dialling. Never a good thing to start too high or you could end up with a frozen bolt...and never too useful to load so hot that the rounds cannot be used in changing temperatures at the extreme ends.
25 May 2017
@ 12:10 pm (GMT)

Ed Sybert

Re: 7x57 Cold Weather Powders?
Here in the USA, certain Hodgdon powders with "Extreme" added to the powder number are billed as being much less temperature sensitive than the non-Extreme (earlier) versions. I can say from personal experience that Varget Extreme and H-4895 Extreme are very stable from at least -20F through the mid 90F temperature range. These work very well in my personal favorite hunting calibers from .223 through the 30-30, .308, .35 Remington and .35 Whelen. H-4350 Extreme is great with the heavier bullets in my 7-08 and 30-06. Good shooting, Ed
03 Jun 2017
@ 06:22 am (GMT)

John Smith

Re: 7x57 Cold Weather Powders?
In my Ruger No. 1A in 7x57 I have good shooting with 42.8 gr. of IMR
4350 behind a Hornady 162 gr. A-Max bullet. OAL - 3.045". Our elk season here in
eastern Washington state is pretty early so I do not experience cold
temperatures like you do. Maybe 20 to 30 degrees.


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