Thread: 7x47 Jumbo

Hi guys
I'm new to all this and don't have any reloading experience but would love to build a custom rifle in a custom wildcat. I'm an engineer so recreating the wheel using a different method works for me. I've been doing a lot of reading over the last year or three. I like what the ammunition companies have attempted to do with the short magnums but they all seem to have just missed the mark. If you load the long heavy bullets required for long range work into these cartridges they don't fit the short actions they were intended to be used in. 1000m is the new 300m. If you shoot under 300m then please ignore me. I read an article on the 7mm Fatso and thought it was a great idea with a well thought out set of goals. On the same theme, why not shorten the 338LM down to 47mm and necked to 7mm Cal. Nice long neck 8.7mm and a 40deg shoulder. You could seat a 180VLD with a COAL of 71.2mm and have a slightly higher case capacity than the 284Win. Make a great long range mountain rifle and I'm sure the F-class guys would give it a go. A true short action magnum.

Your thoughts?

Forming the brass would be "fun"

Thats what I was thinking.

Neck that fucker down to .1 cal and machine up some hollow point tungsten bullets, then ill be impressed!

i say go for it. im interested. im just shooting my 7wsm in a long action to get over the short action problems. even just for the fun of doing it as a project and having something unique it would be fun. im assuming you have access to a lathe and mill? i would practice first and rebarrel something that you already have. maybe take a factor rifle you have and just set the barrel back a bit to get used to the gunsmithing thing. there are a feww little 'learnings' that im in the process of working out

just post pics when you do do it!

my current drawing

So what action would you base it on?
Just thinking about the whole Rem700 v 338 LApua base size argument with bolt face issue etc?

I don't believe there is anything commercially available at the moment.
I was thinking a short version of the Barnard PLM would be a good start.

Any WSM action would do it, wouldn't it? Or does the Lapua have a bigger case head?

The Lapua case head is bigger than a WSM. Some smiths will build a Lapua on a Rem 700, others won't. The larger the case head the greater the bolt thrust for the same pressure.

I see the issue with available actions then.

Get a rem short action. Am long action over size bolt am shorten it to suit job done if you going to that trouble doing it youself in whole hog. Making an forming the brass wouldn't be to bad either.

Would feed like a worn out old whore tho but with work might not be to bad, an 2shot mag.

Go on you know you want to

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I have thought of this what you are doing also, the norma necked down just goes easier, that's in long action tho. A grunty short action be cool tho.

Following with interest

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Build it on a ruger No1 and no problems with mags or bolt face issues yes?