7 Rem. Mag. And 140 Barnes TSX..

[7stw]

Went to the range today with a new 7 mag, 700 LSS, that I picked up around Christmas time. Rifle has a 24 inch stainless barrel, and the "J-lock". Using the 140 TSX, and 67.5 grains of H4831, Norma once fired, neck sized brass, I fired two groups with 215 fed mag primers, and two groups with WLR primers. Both the groups with the WLR primers were much better than the mag primers. I also had loaded 3 each of 66.5 rl19, and the same bullet, with the 215' and 3 with WLR, and same load. Again, the groups with the WLR, or better put,(standard) primer, were much tighter. I have ran into this before with my 700P in 7 Mag. I am passing this along, because I know that there are a lot of us that are seeking info on 7 mags,that I thought this may be of help. There seems to be a stigma, that if it is a " mag" then you must put a mag primer in it or it wont shoot. I have dis proved this many times. Sometimes the opposite is true. I had .280 once that loved CCI 250's. Just wanted to pass this along!

AIM SMALL, MISS SMALL, lightbulb gun) 7 STW.

 

[Derek M.]

I've read many times that the 7mag (and I'm guessing any other belted mag), do quite well with regular non-mag primers as it creates a less "violent" ignition and the powder burns up the column more evenly. These are not my words, just what I've heard.

I've been tempted to try non-mag primers in my 7mag but have been lucky to find excellent loads with 215Ms.

 

[7stw]

I've read many times that the 7mag (and I'm guessing any other belted mag), do quite well with regular non-mag primers as it creates a less "violent" ignition and the powder burns up the column more evenly. These are not my words, just what I've heard.

I've been tempted to try non-mag primers in my 7mag but have been lucky to find excellent loads with 215Ms.

Derek, on EVERY 7 mag that I have been involved with, when you get one that likes the standard primer, versus the mag primer, the SD, And ES drop dramatically. Well, I have seen that before as well in other calibers, but it doesn't mean that it is accurate. My sons Winchester is the same way. My 700 P is less than 10 ES. By the way, this gin loves these TSX's. These are not the TTSX. AWESOME accuracy. Need to chrono it, and shoot it at 200. Thanks.
7 STW.

 

[Firecat]

I have a Ruger M77 with the tang safety that loves these bullets. I am also shooting the TSX not the TTSX. I am driving mine with CCI 250's and IMR 4831. I killed my spike elk this year with this combo at around 200 yards. Wicked mean! It is interesting sometimes what rifles prefer. I have a 220 Swift that rocks out with CCI 250's. Who would have thunk it? I have pulled down several five shot groups that measured in the .3's and it's a factory Ruger M77 MkII. All I have done to it is float the barrel. Interesting. Thanks for sharing.