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7mm RM/140 AB with H4350/H4831SC/H1000/Retumbo?

 
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  #8  
Old 06-13-2011, 06:22 PM
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Join Date: May 2011
Posts: 17
Re: 7mm RM/140 AB with H4350/H4831SC/H1000/Retumbo?

Quote:
Originally Posted by preventec47 View Post
you need to go to Hogdon website and study the loads for your caliber
and bullet weight instead of asking for recomendations.
Get a chart of burn rates for different mfg powders and then
you will know what powders to use for your bullet weight.
I prefer the Alliant RL powders and Accurate powders for
my 7mm Rem Mag but I only shoot real light bullets now
that I have seen the light. Pro hunter 120 gr and Barnes
110 gr in 7mm Rem Mag for big deer and big hogs.
+1 on visiting Hodgdon.com.
If I had done that before, instead of just reading the Barnes Reloading Manual (and getting input from the Sierra manual) I would have chosen a different powder.

I am shooting 150 gr TTSX bullets, and chose Retumbo.
GREAT accuracy (0.35" groups), and really good velocity (2964 fps) . . . but evidently not enough pressure to seal the case well enough -- I'm getting burnt powder residue on the outside of my case shoulders.
(maybe an issue with cold-worked brass, but this is only the 3rd reloading?)

H1000 would probably have been a better choice.
A little higher pressure for the starting loads, and no compressed loads at max charge.
I guess having compressed loads is not really a big issue, but I'd rather have a load density in the mid 90's, all else being equal.
(BTW, thank you, Hodgdon website for listing pressures, though . . .couldn't you have done them all in the same units? CUP? Really?
So now I have to hunt around for how to convert . . . and, yes, it can be done.)

The IMR 4831 also works very well in my gun (and might be a better choice if I were shooting lighter bullets), but the pressure is nearer the max, and the velocities have not been as consistent for me . . . though accuracy is good. (1/2" groups)


So . . . Preventec . . . enLIGHTen us; why are lighter bullets better?
Do you just like the flatter trajectory?
I'm going Elk and Mule Deer hunting with my 7mm Rem Mag, and a 150 gr TTSX seemed like a good choice.

If I were shooting 110 gr bullets, I might grab my Dad's 270 WSM instead . . .
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  #9  
Old 06-13-2011, 09:41 PM
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Re: 7mm RM/140 AB with H4350/H4831SC/H1000/Retumbo?

Based on a quick search, it looks like H4831 or H1000 would be good choices...

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