7mm Remington mag with n570 180 bergers

No drop tube the oal is 3.43 I have 2 guns that I run n570 a 300 rum that I shoot 90 grains with 225 eldm's and a 264 win mag with 156 Berger's that likes 63.4 grains. I just thought I would try n570 to see what it would do. I need to go check the es and sd and see what it does
I have the bthp and eldm in 225 for 300wm, but the heaviest I have for 264 is 150smk. I'm hoping to go a mile with them (150smk). IF, ql is close to velocity I could be in the 3,300+fps range with the smk? Drop isn't the issue, but drift (if not calm enough) might make me in no man's land.
 
Little revival from my testing with 180 hybrids and tumbo (i know its a thread on 570 but thought id add findings). I was getting well over 3000fps with charges from 70.5-72. 72 grains of retumbo was 3250. Personally I am astonished with this speed. Anyone see that out of their 7rm? It's a SAAMI 26"....
 
Little revival from my testing with 180 hybrids and tumbo (i know its a thread on 570 but thought id add findings). I was getting well over 3000fps with charges from 70.5-72. 72 grains of retumbo was 3250. Personally I am astonished with this speed. Anyone see that out of their 7rm? It's a SAAMI 26"....
You need a new chronograph and better life insurance.
 
The chrono speeds were verified to 950 with a kill at 800 last year....maybe this year it's not working accurately...🤷‍♂️
 
I have a 7 mag Remington 700 it's a newer rr action 26 inch barrel it's not a gun I hunt with anyway I thought I would try n570 for fun with 180 berger vld. I shot in increments of .4 and worked up to 74 grains the node was at 72.8 at 2980 fps shot pretty well at 100 3/4 inch I haven't ran it past my labradar yet to check es and sd 72.8 is about at the max I can put in the case before it becomes compressed I'm not getting a sticky bolt lift but it's close I haven't seen to much info on this combo has anyone played around with n570 in a 7mag?
I know that primers are hard to come by, but I think you will find running either Winchester Magnum Primers, and or Fed 215 a better suited primer. N570 usually runs a compressed load due to the powder being about the size of Lincoln Logs. Personally found much better velocity, ES, and SD running a hotter primer. Just an opinion.
 
OP or others with the charge weights over 70+ with these. What is your brass life like? Have you loaded them several times yet? Primer pockets?

I topped out at 68gr with accuracy and a 177gr mono in Peterson brass and 67gr with a 190 LRHT. Throat extended to load long.

I have found a velocity/pressure swings with different lots of N570.
 
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