7mm 08

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Kakaduthunder
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7mm 08

#1 Postby Kakaduthunder » Wed Oct 05, 2016 4:16 pm

I am currently enjoying shooting practical shooting matches in the Nt and looking to put together a rifle for next year. I was lucky enough to win a 7mm barrel donated by long shot shooting supplies at the final.

I have decided it is going to be a 7mm08. As these matches need to be mag fed I am chasing some info on 140 grain and 162 grain 7mm pills. I am trying to work out what free bore I should spec on the reamer. I would love if someone could supply me with the overall length of some of these projies as well as the distance to ogive? As I am in Darwin I don't have good access to high end components and don't really want to order boxes of projies I won't need.

I know a lot of fclass shooters use 180 grainers so if you have some lengths on those to it will be helpful. I very much doubt however that I can get them to work at mag length plus the 7-08 lacks the boiler room to drive them.

I thank you in advance for your response.

superx10
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Re: 7mm 08

#2 Postby superx10 » Wed Oct 05, 2016 5:35 pm

Hay Plumb7 THIS WON IS FOR YOU.

ShaneG
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Re: 7mm 08

#3 Postby ShaneG » Thu Oct 06, 2016 11:50 am

Have a think about 6.5 Creedmore or 260 Rem as those seem to be the most popular Cartridges for that game in the US?

S.S NO FEAR
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Re: 7mm 08

#4 Postby S.S NO FEAR » Thu Oct 06, 2016 2:46 pm

YES a 6.5 creedy will do the job . 140 amax . then buy a 6.5 ruger precision ,10 shot mag , and you will not have to look back or wonder if i did the right thing.my :D

6602steven
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Re: 7mm 08

#5 Postby 6602steven » Thu Oct 06, 2016 3:49 pm

May be a bit tough getting the accuracy required shooting 6.5 creedmore down a 7mm barrel hahahahah

7X47 or 7-08 and stick with 168's

Steve

Kakaduthunder
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Re: 7mm 08

#6 Postby Kakaduthunder » Thu Oct 06, 2016 4:04 pm

I hear you on the 6.5 options but I didn't win a 6.5 mm barrel. I am kinda limited on funds so this barrel will be going on my existing Remington short action in left hand. I considered the 7 x47 but after forming and neck turning for my .284 I want my brass prep to be as follows:
1 Take shiny new brass out of blue box with lapua written on the side
2 trim
3 fill with primer, powder and projies
3 go shoot.

We are really only shooting out to 500meters at Moa-ish plates due to range length restrictions. Most of the shooting is done out of position so ultimate bullseye precision is not require. It does always help however to have a rifle that shoots straight.

Kakaduthunder
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Re: 7mm 08

#7 Postby Kakaduthunder » Thu Oct 06, 2016 4:06 pm

Oh and no ruger Prescion rifles in the Nt due to the stock. At least not yet anyways.

plumbs7
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Re: 7mm 08

#8 Postby plumbs7 » Thu Oct 06, 2016 9:00 pm

Kakaduthunder wrote:Oh and no ruger Prescion rifles in the Nt due to the stock. At least not yet anyways.


Hi John , love the name change and so Nt!

Judging by what you have said above 7x 47 lap would be my choice and performance difference with 162 Amax and 7-08 Ai would be close . Bit like .284 and 7-08 Ai . The 7x 47 lap would feed better too!

In saying that the 7-08 Ai would handle 162 Amaxs very well as with 168's it really loves them.
I took a photo of an old 7-08ai case with a 168 vld seated at mag depth ( accuracy international). And a 168 vld by its side to show how much case capacity it taken up by the 168's base. This isn't a problem accuracy wise for what ur doing and you can load less powder for the same speed . Good luck mate !
Regards Graham.
Image

Kakaduthunder
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Re: 7mm 08

#9 Postby Kakaduthunder » Thu Oct 06, 2016 9:23 pm

Thanks Graham. You couldn't by any chance take a measurement from the base of the case to the ogive when you get the chance. Free bore length is what I am looking for. Am I correct that they are Berger 168 vlds?

plumbs7
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Re: 7mm 08

#10 Postby plumbs7 » Thu Oct 06, 2016 10:10 pm

Kakaduthunder wrote:Thanks Graham. You couldn't by any chance take a measurement from the base of the case to the ogive when you get the chance. Free bore length is what I am looking for. Am I correct that they are Berger 168 vlds?


I had to come up with a novel way to measure the ogive as I've never owned an ogive nut thingy! So I just reversed another 7-08 Ai case and measured from there! Yes it's 168's Bergers .
At short ranges 300 - 600 168 smk's and Bergers rules .
If you go this way and don't want much work etc neck turning. Just use lap 7-08 brass and a no turn neck about .318-.320 neck approximately. Best to by a some 7-08 R.E.M. Lap brass and go about 3 -4 thou bigger. I run mine at .312 tight neck and neck turn about .310-311 neck. It's close and don't want closer or you'll have erratic speads in velocities.
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Ok so just buy 7-08 R.E.M. Lap brass , load 168 vld's mag length with ( use with caution ) load with 45. Gr of 2209 and Cci or fed Lr primers , 5 thou jam or soft touch and shoot . My ff load is 46 gr of 2209 168's and had a and sd of 1 and 8 shots through the same hole at 100 m's at 2690 fps (30" barrel).
Image.
So it can be just load and shoot if you want to go that way especially with 7-08 R.E.M. Cases and no turn neck! :lol:

Kakaduthunder
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Re: 7mm 08

#11 Postby Kakaduthunder » Fri Oct 07, 2016 11:51 pm

Clever, I like what you have done with the case. The only thing that could throw that slightly off is the neck tension you are running on your die. Maybe it was a fired case? A 7mm projie will engage the lands at a diameter of . 282. With a 7-08 reamer at 0.170 free bore ( which ptg have recommended ) the base of case to ogive length is 2.279. That means if your measurement is correct ( which it must be really close) and I use the same mags, which I do, and the same projies I will be miles off the lands. I think I am going to buy some cases, dies and projies and take some carefull measurements.

I like the look of the hornady eld 162s but am open to suggestions. I hate having to change a pet load because components aren't readily available .Where is the best place to get lapua brass these days and hornady and Berger projies? Anything I get will be mail ordered so it really doesn't matter where. How about a recommendation on dies. Should I just run lee deluxe dies or should I spring for Redding comp dies or the like?

Thanks for all your help.

John S

Kakaduthunder
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Re: 7mm 08

#12 Postby Kakaduthunder » Sat Oct 08, 2016 12:00 am

Plumbs just re-reading your last post, I would have thought you would have got slightly more velocity then stated with a 30 inch barrel. Accuracy is king but do other powders give a bit more velocity? It really only matters if I go down south to compete, which I have been asked to do, as they sometimes stretch shots out past a 1000m for a couple of stages. That group and Sd is fantastic. What barrel profile are you running?

plumbs7
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Re: 7mm 08

#13 Postby plumbs7 » Sat Oct 08, 2016 8:48 am

Kakaduthunder wrote:Plumbs just re-reading your last post, I would have thought you would have got slightly more velocity then stated with a 30 inch barrel. Accuracy is king but do other powders give a bit more velocity? It really only matters if I go down south to compete, which I have been asked to do, as they sometimes stretch shots out past a 1000m for a couple of stages. That group and Sd is fantastic. What barrel profile are you running?

If you want to do all of that past 1000 m'a but mainly compete until to 600 m most definitely 7-08 Ai .
I just did a feed test in my Rem 700 " black Betty " with the accuracy int mag and it was beautiful! What u r building would make a great Lr rig ! If it were me I would go 28" heavy varmint prof. You can also make shorter at a later date. You should easily achieve 2820 fps with Berger 168vld's. 2690 fps is a fireforming load . Also remember my loads will be about 1 gr more than ur load because of the projectile base protruding into the case a fare way. So be careful! Need a 1-9 twist and that will keep u
Out of the dead speed zone with dynamic stability. I Ryan some ballistics on my JBM, and looks very capable and even turns me on a bit lol! :mrgreen:
Image
Image

plumbs7
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Re: 7mm 08

#14 Postby plumbs7 » Sat Oct 08, 2016 9:16 am

Moving along , yes that's a fired case . But because of the close tolerances of tight neck I run , it still holds about .5 thou neck tension so that measurement would be smaller. Pm mate with ur address and I'll post a 7-08 Ai case and 168 vld ? That way you can't get it wrong! I haven't tried other powers , 2009 seems to be just right on but can't advise you on any others.
Image
Above is just a straight lee 7-08 rem die set. I use this to neck down .308 brass and also use the bullet seater for either 7-08 and 7-08 Ai as this operates very much like a redding competition bullet seater and give very little runout.
If you are a cheap scape like me and are using 308 brass ( lap .308 $88/100) to form down to 7 mm you will need to neck turn just to face the neck leaving about %20 of the dull neck behind.
I just measured a necked down .308 lap brass neck and it was .317. So a .320 neck on ur reamer ( or if were me I may go even .3195 ).
I love ❤️ this little case and it most definitely has its place in f class and prize meets . 284 form me is business but the 7-08ai is fun! Please don't take this the wrong way guys ?
But it's a lot of satisfaction beating larger cals that are ballistically superior to this lil case.
But just get beaten by the accuracy it is able to achieve! Good luck John!
Regards Graham.
Last edited by plumbs7 on Sat Oct 08, 2016 9:26 am, edited 1 time in total.

plumbs7
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Re: 7mm 08

#15 Postby plumbs7 » Sat Oct 08, 2016 9:22 am

Sorry , I forgot to mention ( maybe you already know about this). There is 8 pages of the development
Of this cal and also credits the people who started using it first . It has lots of info in it and is now at a crazy 7880 odd views . This would clearly be international interest, would have to be ? !!
viewtopic.php?f=5&t=7100


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