Thread: Big Sevens... Which one for the 195 Berger.....?

The next build will be a 7mm of some description for long range hunting.

I'm a firm believer when deciding on what to build you start with the projectile / calibre then the cartridge chambered to suit said projectile.

So its the 7mm 195 Berger EOL and 175 ELD-X.

It will be based on a R700 long action as they have the largest mag box and lots of aftermarket parts.

The hard bit is the cartridge.

My initial thoughts are 7mm-300 Norma Magnum with a 30 deg shoulder AKA Long Range Hunter by @Swamplord. Brass looks easy but dies i'm not sure about due to a lack of knowledge.



This should net between 3200-3300 fps from a 26-28" bbl, which translates to a 1500m rifle (1600fps).

My question is: Will a RUM or STW or 28 Nosler or 7 LRM / Dakota / 7-375 R, 7mm-338 Lap 7mm-300WSM be easier due to dies and brass availability?

I already have a 338 Lap and 264 WM so this is a 'want' not a 'need'.

Cheers,

F.

I don't think you will see enough speed out of a 7/300wsm. It is barely enough for 180s.
Your original idea sounds great, but throat erosion will be a factor at those speeds

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I like the idea of 28 nosler

7mm Blaser , norma brass ,

@Kiwi Greg would be a good man to talk to.

7 RUM would be good, but you won't fit one in the magazine. Maybe if you extended the magazine a bit. When I had my 7 RUM I used the 180gr Berger hybrid. I had to single feed it, I hadn't extended the magazine. I got 3200 pretty easy with about 100gr US869. I got Greg Duley to rechamber it using his short throat reamer.
If you want the most velocity I'd try the 7 superfatso from Greg Duley it is based off the 338 lapua and improved. The easiest will be 7RUM.

Originally Posted by stug

7 RUM would be good, but you won't fit one in the magazine. Maybe if you extended the magazine a bit. When I had my 7 RUM I used the 180gr Berger hybrid. I had to single feed it, I hadn't extended the magazine. I got 3200 pretty easy with about 100gr US869. I got Greg Duley to rechamber it using his short throat reamer.
If you want the most velocity I'd try the 7 superfatso from Greg Duley it is based off the 338 lapua and improved. The easiest will be 7RUM.

I was using 98gr of us869 for 3275fps with the 180 but now 84gr 2225 for 3245fps. Considered the 195 but need a 1:8 twist and the gains are not dramatic enough for me. Building a rifle from scratch though I'd probably give them a go

Pardon me for being confused.... but if a 7WSM pokes out a 162Amax at about 3100 for around 62 grains of powder and a 7SAUM does around 2950 for even less...

Why do we get excited about 180 grain burgers for only a little more speed, 100 grains of powder and a shagged barrel in even less time?

BC

Wow more brains then sence.
Some body needs to be the foram wanker might as well be me,

Not getting at you personly ?
But Wtf are you up to daisy . A 1.6 k hunting rifle ?
On average i shoot and sell around 1500-2000 roo per year and export them for pet food, 400 is about my max but only use a blk ,

Im curios , if you build this thing will your 22 inch moa at 1.6 1 moa gun at 100 be accurate enouf for a man with 3 guns that dose not no what he wants and has to asks internet advice to make a decision ?

Plenty of people shooting a lot further than 400 at animals a lot gruntier than Roos. There is also a difference between shooting an animal at 1600, and just having a rifle that could do it.

Nathan Foster does a 7mm Practical which sounds like it maybe could be??

7mm practical is the 300 win mag necked down and shoulder changed. Better than the rem mag, but behind the RUM. I think it is around 80ish grains of capacity/powder.

So the Gunsmith said RUM's eat barrels at too fast a rate and recommends the 7 LRM / Dakota or 7-375. (personally don't care about Barrel life)

Would the practical (7 - 300 Win) be the same? or a STW?

I can / will get a wyats box fitted for a longer magazine.
@6MMBR I know what I want in terms of performance mate, I'm just smart enough to know what I don't know and defer to those who have already burn't out a few barrels in a big 7mm rig. I have shot goats and wallabies to 1100m mate, just want to go a bit further is all and hopefully its a half moa gun

ballisticstudies.com/Knowledgebase/7mm+Practical.html