7mm Grendel / 7mm 7.62x39mm Wildcats

[kurtz]

Sorry about hijacking your thread N310.

kurtz,

I wondered what it would look like fireformed :grin: very nice...Have any load data you wouldnt mind passing along? I'm having no success using quickload for subsonic.
$pendel came from spending more than I should have.


Agreed.....can do another thread?


http://www.quarterbore.net/forums/photopost/data/500/thumbs/7mmARk-web.jpg

[kurtz]

I call mine the 7mm ARk.....laid out to work in the AR platform, k for kurz (short) ....shortened slightly to avoid inadvertently chambering a Grendel, not that it would hurt anything, we cross caliber fireform brass for our bench guns all the time....mainly to prevent having a blooper on a critical shot..

I've built (4) ARs and (1) CZ bolt gun so far.....finishing the 5th AR tonight for a range run in the morning and started the 2nd CZ yesterday....All were set up for supersonic....pretty easy to get a 120 Nosler moving over 2,800fps.....good bit of power in a small platform, something around 90% of a 7-08....haven't done any sub-sonic, so can't help you out with load data on that one...

6.8, 7mm, .30 ARk

http://www.quarterbore.net/forums/photopost/data/500/thumbs/68ARk-line-up-web.jpg (http://www.quarterbore.net/forums/photopost/showphoto.php?photo=753)

I built a sub-sonic 7mm based on shortened SPC brass a while back....the
TAC7, around ~ 7 or 8 grains less capacity than the grendel, don't know if that will help much....

TAC7 line-up

http://www.quarterbore.net/forums/photopost/data/500/thumbs/TAC7-lineup-web.jpg (http://www.quarterbore.net/forums/photopost/showphoto.php?photo=758)

[Spook]

This is pretty neat. Glad I thought of it...right after you did:smile:. I think I was right behind you with the 338X39 too?...shoulda just pm'ed you to see what you were thinking.

2800 for a 120 is pretty amazing, how long a barrel? Accuracy is good?
Who's barrel did you use? Do you have a source for the 7.62 CZ actions? My guy only has 223's and Hornets.

Growing a beard waiting for Rock Creek to supply the 6.5T.
I was going for subsonic using 162 Horn. and 180 Berg. ...Got a 6ppc bushing die cut out, still have to order the expander, stem, and sizer bushing. I'll get a 7br seater coming....thanks for the tip.

[kurtz]

This is pretty neat. Glad I thought of it...right after you did:smile:. I think I was right behind you with the 338X39 too?...shoulda just pm'ed you to see what you were thinking.



I mostly chase super-sonic stuff....

started on the .30, .338, and .358 a couple years ago for a few local shooters....then they just sat there...no real interest, probably shoot the
10.5" .358 the most....later found out that Lapua had a .338 version for something like five years...





2800 for a 120 is pretty amazing, how long a barrel? Accuracy is good?
Who's barrel did you use? Do you have a source for the 7.62 CZ actions? My guy only has 223's and Hornets.



The numbers looked really good laying out the 7mm, and they wern't too far off....in the popular rifle length AR barrels (18 - 20") the 7 smokes the .30....the case / bore / lenght compliment each other real well.....

20" 1:14 PacNor benchgun blank, pulled and cut for the AR

http://www.quarterbore.net/forums/photopost/data/500/thumbs/7ARk-Rifle-web.jpg (http://www.quarterbore.net/forums/photopost/showphoto.php?photo=756)

bolt gun would hold ~ .225" at 200yds, but thought .6 or .7 was pretty good for the AR
http://www.quarterbore.net/forums/photopost/data/500/thumbs/7ARk-200yd-web.jpg (http://www.quarterbore.net/forums/photopost/showphoto.php?photo=760)

Unfortunatly I had to go the long and expensive route with the CZ....bought a x39 carbine, ordered a 20" pacnor blank, hs stock, etc.....my daughter confiscated it, then tells me she likes the wood stock better :eek:

http://www.quarterbore.net/forums/photopost/data/500/thumbs/7mm-CZ-527-web.jpg (http://www.quarterbore.net/forums/photopost/showphoto.php?photo=751)





Growing a beard waiting for Rock Creek to supply the 6.5T.
I was going for subsonic using 162 Horn. and 180 Berg. ...Got a 6ppc bushing die cut out, still have to order the expander, stem, and sizer bushing. I'll get a 7br seater coming....thanks for the tip.



The Redding neck bushing die works pretty good, open the hole a few thow....the stem is kinda a pain in the rear, found a RCBS 7 TCU tapered expander fits the small threads of the Redding die....The TAC7 (7mmSPC) is the only suppressed stuff I'm messing with right now, besides my Whispers and lil-ole baby MAC....The TAC really likes the 162 and 180 subs.....the 120 subs make a funny sound when they smack the plates at 200 yds, kinda like a ladyfinger firecracker going off, just noticable from the others....

TAC7
http://www.quarterbore.net/forums/photopost/data/500/thumbs/TAC7-suppressed-web.jpg (http://www.quarterbore.net/forums/photopost/showphoto.php?photo=759)