The Accurate Reloading Forums
which powder
28 January 2006, 08:25
solamanwhich powder
Iam new to reloading and i want to work up a load for my 7mm rem mag.Iam going to be loading the new barnes mrx in 140 gr.What would be the best powder to start with,and how many grains?Iam going to be shooting 2 to 500 yards.none
28 January 2006, 23:24
rootbeerUse an extruded powder. Extruded powders do the majority of their burning in the case. Ball powders achieve their maximum heat in the barrel, about midway down, which tends to shorten barrel life considerably. I'd look at using Hodgdon H4831SC or H4350 in your rifle.
29 January 2006, 00:11
Jay JohnsonSolaman
I’ve done a lot of 7MM Remington development since 1973. My gun has always seemed to favor IMR 4350. Two of my favorite loads out of Hornady’s Volume II are 139 Gr. Hornady SP with 68.2 Gr. of IMR 4350 and 162 Gr. BTSP with 63.0 Gr. of IMR 4350. These two loads have accounted for the Lions share of my deer/elk.
The 139 has one kill on a Mullie in Wyoming at just over 500 yards.
29 January 2006, 01:19
lookoutyou should try the IMR 4350, Rootbeer, say it isn't so, I thought the ball powders were cooler burning, ie: win 748, win 760 etc.
02 February 2006, 23:17
nwwashimr 4350,imr4831 and reloader powders work well
03 February 2006, 00:33
ricciardelliRL-25 From 66.5 grains to 71.5 grains
CCI-200 Primer
03 February 2006, 05:46
MontMikeI prefer RL22 for the 7 mag. Seems to be the most consistant for me.
03 February 2006, 05:58
Geo.>I thought the ball powders were cooler burning,<
That was a myth started because ball powders had apparently caused less throat erosion in some cases. It turned out, however, that the peak flame temperature simply occurs farther down the barrel--that is due to the shape of ball powders and the naturally degressive burning rate and it is a product of most of them being coated with a flame retardant to even out the burning rate.
Most ball powders are double-base powders and contain nitroglycerin. These have been blamed for causing more erosion in some cases.
You can't win. Your barrel is going to wear out.
Geo.
03 February 2006, 06:02
vapodogquote:
Originally posted by rootbeer:
Use an extruded powder. Extruded powders do the majority of their burning in the case. Ball powders achieve their maximum heat in the barrel, about midway down, which tends to shorten barrel life considerably. I'd look at using Hodgdon H4831SC or H4350 in your rifle.
I don't believe this at all.....and I'd not hesitate to use a ball powder if the performance warranted it.
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03 February 2006, 06:08
fredj338First, if you are a new loader get at least 2 loading manuals & READ them. Get someone to show you what's going on if possible. It's not ricket science but you do need some info.
I like slower powders than 4350 in the 7mag. After all you bought it for the speed right, slower powders will give you that w/ less pressure & 100% load density which often means better accuracy. IMR4831 is about as fast as I would go & prefer IMR7828 or RL22. Start w/ a load in the middle & work up in 1/2gr increments, whatching pressure signs (read those books). Your rifle will tell you which is the most accurate, you'll need a chronograph to find out how fast your 140gr bullets are really moving, the book data is just an estimate in your rifle.
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03 February 2006, 10:50
Allan DeGrootI'll also vote for RL22 as probably the best propellant for the 7mmRemMag.
AllanD
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03 February 2006, 20:09
FjoldMine likes 4831SC with the Barnes 140 TSX
Frank
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04 February 2006, 06:15
gixxerRL22 or H-4831SC. The 4831SC goes through the powder measure better. I would try RL25 or that new Retumbo for heavier bullets.
