Making 7 PRC Brass
- Thread starter Terry
- Start date
You need to push shoulder and neck down 300 PRC brass. I would anneal, thoroughly lube the brass then run it through your 7mm PRC full length sizer if a bushing die maybe remove bushing while pushing shoulder back. Once shoulder is pushed back you can size the neck, you may need to turn the necks possibly on the inside also as some of the original shoulder is now neck in your new brass.
Not as bad as it sounds
B23
Gold $$ Contributor
Making it from 300 PRC brass, since it's so much longer, would be more of a whole different case forming process. Referring to it as pushing the shoulder back could be a bit confusing since it's such a huge change. I think there's something like 300 thou difference in the location of the shoulder between the 300PRC and 7PRC.
From a gutted FL 7PRC die and lubbed properly like wwbrown suggested it should be a pretty straight forward deal but obviously there will be a substantial amount of excess to cut off once the cases are formed. I suppose you could possibly cut them off first but that would require some trial and error and you would probably lose a few cases before you got things dialed in.
From a gutted FL 7PRC die and lubbed properly like wwbrown suggested it should be a pretty straight forward deal but obviously there will be a substantial amount of excess to cut off once the cases are formed. I suppose you could possibly cut them off first but that would require some trial and error and you would probably lose a few cases before you got things dialed in.
Sounds like crushed cases to me..
Im thinking it'd be a whole lot easier going with a 7mm that has components available.
Im thinking it'd be a whole lot easier going with a 7mm that has components available.
LVLAaron
Gold $$ Contributor
Hilarious. Huge PR release campaign, sending ammo, reamers, dies, etc to youtubers to do a product showcase... then not have anything available.
Yeah but its been sooo fun watching all the Bros hype it up right..
It's the same every year with most manufacturers. Things get set in motion in 2021, designs are finalized, prototypes get built, specs submitted to SAAMI, short run of ammo to provide the writers. Word leaks out, articles are published. The feeding frenzy begins and everyone waits for the scheduled production run. Oh then there are the firearms manufacturers that have to build rifles for just in time delivery. It's the way business has to work. Hornady could be making a run of 7PRC ammo right now that would sit waiting on rifles to be built or they could continue making ammo that people can use right now.
B23
Gold $$ Contributor
True, but it's not really any different than a lot of other industries. Look at the car industry and something like the new Ford Raptor R. Ford officially releases it's no longer just and idea but a truck they're actually going to build, a few are built and tested, some articles are written, orders are placed, then everyone sits and waits not having a clue when or if they'll even be able to get the one they ordered. Not exactly apples to apples but similar idea.
Gargoyle
Finder Outer
Remember 2001 with the short mags? Lol
Another thing to consider if you're building a 7 PRC is the whole tight chamber clicker issue, it looks like Hornady is repeating the same design issues that plague the other two prcs.
I'd wait to see what sort of sizing issues people are having and chose your reamer accordingly.
I'd wait to see what sort of sizing issues people are having and chose your reamer accordingly.
Do you have the reamer and lathe? If you do and a lathe you can make some forming dies to push the shoulder back in steps of the 300 PRC brass. just thread some stock to 7/8-14 bore out for the pilot and ream out until you have the shoulder and maybe .200" of the body. Then bore out the neck so you can push back a portion of the shoulder.
You can easily ream out each end so you can progressively push the shoulder back in three stages. Two from the die that you made and the final using the 7 PRC die. Taking the shoulder back in three stages should keep anything from collapsing and a much easier pull on the press.
Hopefully my brief explanation makes sense, if not and you are interested I can expand.
You can easily ream out each end so you can progressively push the shoulder back in three stages. Two from the die that you made and the final using the 7 PRC die. Taking the shoulder back in three stages should keep anything from collapsing and a much easier pull on the press.
Hopefully my brief explanation makes sense, if not and you are interested I can expand.
Alex Wheeler
Site $$ Sponsor
Solved, my reamer is available from JGS
Ledd Slinger
Silver $$ Contributor
I believe @DaveTooley played around a bunch with a 7mm version of the 375 Ruger when we were all wildcatting off that case following its debut many years ago. He was dropping the neck from 375 all the way down to 7mm but I don’t think the shoulder was set back very far.
There was also the 7mm LRM that “Gunwerks” was pushing which did have its shoulder set back like the 7mm PRC. But this is all old news. Wildcatters have been there and done that already just like they had with all the other PRC designs.
There was also the 7mm LRM that “Gunwerks” was pushing which did have its shoulder set back like the 7mm PRC. But this is all old news. Wildcatters have been there and done that already just like they had with all the other PRC designs.
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We never went down to 7MM. Case capacity is to big. The 7PRC is just about perfect capacity for a 7MM accuracy round shooting heavies. When we, meaning Hornady and myself headed down the 300 HSM ( Hornady Super Match), 300 /338 AI for the military path they just ran some 375 Ruger brass on down to 30 cal.
Like the 6.5 and 300 PRCs? Maybe you're right but I seriously doubt it. They have solved a long standing issue with every cartridge currently available in SAAMI form. The 6.5 has Lapua, ADG, Hornaday, and even Nosler. The 300 Lapua, ADG, Hornady, and Peterson. The 7 is going nowhere soon. Hornady is the only company who gets we don't want our bullets stuffed half way into the case like 100 years ago. Benchrest shooters and custom gun owners are not the ones driving the market.
Ledd Slinger
Silver $$ Contributor
I remember reading about someone doing the 7mm version in various threads many years ago. I though it was you for some reason. My apologies.
I only ever took the case down to 338. Still have the rifle and use it for hunting. Been hunting with it this year actually. Using ADG 300 PRC brass to form cases instead of Hornady 375 Ruger brass was a total game changer. Now it is one heck of a shooter and hunting machine. The ADG brass allowed me to get into an upper accuracy node with the Berger 250gr that I couldn’t reach using Hornady brass because primer pockets wouldn’t hold up.
Below is a photo of my 338-375R case next to a virgin piece of ADG 300 PRC brass I use to make them. My reamer design has more case capacity than just necking up a 300 PRC to 338 cal. I think 30 and 338 cal is where the 375 Ruger parent case capacity really shines. If a person wants to lessen the case capacity of the PRC/Ruger case for a 7mm, then in my opinion they might as well go with a 7mm SAUM or 7mm SAUM Improved.
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