Anyone own a 7mm 300 Win Mag?

[Broz]

A few years back I sat back to back, left/right handed at a long range match with a guy using one with a break....I had a set of inner ear the orangevalve kind, my muffs were stuffed full off those little orange squishy ones and then my muffs over top.... I've sat next to every cartridge know or at least used in matches and never heard anything like it before..it was the loudest and most miserable time I ever spent at any match, my ears rang for two years before it finally fadded, I have no idea how this guy could shoot this, I've hated the name 7mm/300 mag ever since..

I would credit this more to brake design than chambering. I have owned and shot about 1/2 a dozen 7-300's now. No louder than any other rifle with comparable case size. But I remember a few rifles with Vais brakes over the years. I deam them the worst brakes anyone could own. Very abusive to the shooter too and I think the reason some do not like brakes. Yet even today I see some think they are the ticket. Go figure.
Jeff

 

[zorak]

A few years back I sat back to back, left/right handed at a long range match with a guy using one with a break....I had a set of inner ear the orangevalve kind, my muffs were stuffed full off those little orange squishy ones and then my muffs over top.... I've sat next to every cartridge know or at least used in matches and never heard anything like it before..it was the loudest and most miserable time I ever spent at any match, my ears rang for two years before it finally fadded, I have no idea how this guy could shoot this, I've hated the name 7mm/300 mag ever since..

.muzzle brakes are loud anyways.

 

[zorak]

I have a 7/300wby and it shoots like a dream. Waiting on my new scope so I can let it stretch its legs out with Barnes 168gr lrx's and Berger 180gr VLD hunting bullet. I'm loading with new Nosler brass and.have a couple loads ready to test. So I'll post up the results when I get a chance.

 

[Big Jake Duke]

I know this is near blasphemy on a 7mm forum, but i looked at the 284 Jarret, a 7mm-300 win mag and then wondered..........

What if it was in 270!!!!!!

I can hear your groans already, but bear with me. Berger's new 170gr bc over 700, noslers lrab 150 with bc of 625 and cutting edge bc 590 with a 140 make this viable. Two sources sell 1-8'twist 277 barrels.

Results. 170s 75gr Retumbo 3225-3250
165 matrix. Us869. 3275-3300
150 nosler lrab. 3300-3325
140 gr cutting edge 3400 fps

We're having some fun.

 

[FEENIX]

I know this is near blasphemy on a 7mm forum, but i looked at the 284 Jarret, a 7mm-300 win mag and then wondered..........

What if it was in 270!!!!!!

I can hear your groans already, but bear with me. Berger's new 170gr bc over 700, noslers lrab 150 with bc of 625 and cutting edge bc 590 with a 140 make this viable. Two sources sell 1-8'twist 277 barrels.

Results. 170s 75gr Retumbo 3225-3250
165 matrix. Us869. 3275-3300
150 nosler lrab. 3300-3325
140 gr cutting edge 3400 fps

We're having some fun.

That's why I'm trying really hard to stay away from your .270-300 Win Mag thread ... I have to behave. gun)

Cheers!

 

[Big Jake Duke]

That's why I'm trying really hard to stay away from your .270-300 Win Mag thread ... I have to behave. gun)

Cheers!

W

Thats funny- do they know you are poaching over here too?

Keep your 7mm hat on, i wont tell them.

 

[FEENIX]

W

Thats funny- do they know you are poaching over here too?

Keep your 7mm hat on, i wont tell them.

LL! It's been a while now but told you before that I have an extra .300 WM that I was considering your lead on .270-300 Win Mag after when finished my .270 AI.

#11 of http://www.longrangehunting.com/forums/f17/270-300-win-mag-now-feasible-155307/index2.html

If I didn't behave, I would have never finished my latest build.

Cheers!

Ed

 

[M9Powell]

Hi guys awesome thread. My first post here. I spent several hours reading the whole thread. An incredible amount of knowledge here. My hats off too you guys. Soo, what's the deal on the Berger 195s ? Can't push them fast enough too catch the 180s?

 

[Broz]

Hi guys awesome thread. My first post here. I spent several hours reading the whole thread. An incredible amount of knowledge here. My hats off too you guys. Soo, what's the deal on the Berger 195s ? Can't push them fast enough too catch the 180s?

From the same rifle on average we get 3100+ from a 180 H VLD and 2950 to 3000 from a 195. In side the effective limits of a 7mm for hunting its about a wash, in my opinion.

Jeff

 

[M9Powell]

Guess I should tell a bit about myself as I haven't posted here before. I grew up in the Blue ridge mountains on the NC/VA border in the 1960s hunting deer & whistle pigs with the 7 mm Remington magnum when I wasn't too busy chasing girls & hound dawgs ( The potlikkers chased Black bear & wild boar, I chased them). Then I gradiatted to the U.S. Army & NCNG for the next 3 decades shooting tactically & in formal competition with 5.56, 7.62 NATO, 30-338, 300 Win mag & 50 BMG. Oh quite a bit of shooting 9 mm & 45 ACP out of the short bullet launchers in competition also. Retired now.

PS If you're not familiar with the Blue Ridge mountains, if you've ever seen the old tv show The Beverly hillbillies, that's my people.

 

[M9Powell]

From the same rifle on average we get 3100+ from a 180 H VLD and 2950 to 3000 from a 195. In side the effective limits of a 7mm for hunting its about a wash, in my opinion.

Jeff

Thanks for the reply. What about tactically or just recreation shooting? I'm going to build a 7 mm larger than the 7 RM & smaller than the 7 UM. I'm too old & broke down now for much hunting or serious competition anymore, so mostly just a range toy for me, maybe a few sniper matches.

 

[Broz]

Thanks for the reply. What about tactically or just recreation shooting? I'm going to build a 7 mm larger than the 7 RM & smaller than the 7 UM. I'm too old & broke down now for much hunting or serious competition anymore, so mostly just a range toy for me, maybe a few sniper matches.

Distance is the deciding factor then. Run the numbers I gave you in the prior post, in a ballistic calculator and see where the higher BC of the 195 becomes an advantage. Or just do like I do now and shoot a 300 win mag with 215 Bergers.

Jeff

 

[M9Powell]

I still haven't jumped on the whole 7x300wm kick **** either, I have a 7mm wby mag with a 27" Kreiger that runs 180s at 3120 with 73.5grns of H1000, some of my brass now has 3 firings and some that I tested Retumbo in have four firings, pockets still tight, brass holding up great, annealed after 2nd firing. I pushed Retumbo to 76grns compressed with no excessive pressures, primers were flat but I couldn't care less about that, since the web expansion is only .0015", and I haven't had to use the Innovative Tech die to size the base yet, at any rate, the 76grn Retumbo load had 180s going 3212 but the ES was horrible and I had vertical from hell at 300yrds, so the 73.5grns of H1000 at 3120 avg with an avg of an 8fps ES and less than a 1/4" of vertical at 300, is the obvious keeper. I can't justify going to a bigger case and using 10grns more powder for 30-80fps, just isn't enough gain for the hassle, and I can shoot factory ammo if I get in a pinch, not likely, but possible.

7 mm Weatherby is interesting. Are you running the usual Weatherby freebore? What twist?
In my 9th edition Hornady manual the Weatherby outruns the Dakota & the STW with the heaviest bullets listed (175s). And equals the Ultimag with a lot less powder.

7 mm Weatheby 26" barrel
3100 fps 70.1 grs of H4831, 71.8 grs RL-22, 76.1 grs H1000.

7 Dakota 25"
3000 fps 73.5 grs RL-22, 77.6 grs RL-25

7 STW 26"
3000 fps 68.6 grs RL-19, 79.9 grs VIHT 24N41

7 RUM 26"
3100 fps 88.6 grs RL-25 all the other powders topped out @ 3000 fps so 1 could make the argument that the Weatherby beats it with 18 grs less powder.

 

[M9Powell]

Distance is the deciding factor then. Run the numbers I gave you in the prior post, in a ballistic calculator and see where the higher BC of the 195 becomes an advantage. Or just do like I do now and shoot a 300 win mag with 215 Bergers.

Jeff

Ahh, the 30-338 (in an issue pre-64 model 70 bull gun no less) weaned me from that stubby necked contraption .