Has anybody tried to make a 6.5-223, 7-223 or 30-223?

The 30-223 is very similar to the 300 Whisper, but the 6.5 and 7mm has very high BC bullets. Im wondering what speeds I could be able to get out of a these with:

100-160 grain in 6.5
120-180 grain in 7mm
160-220 grain in 30 cal

As a bonus, here in norway its legal to use silencers, and if the speed is low enough (1050 fps?) how far will I be able to use as a point blank range with either of these high BC bullets? Its around .5-.8

This would be used for Roe deer..

Look up the 6.5 mm and 7mm TCU's These were developed for use in handgun silouette competition, and have found favor with deer hunters. In a 14" pistol barrel either round will push a 120 gr ~2200 fps. The TCU's are a slightly improved chamber design over a simple necked up .223.

I'd be concerned about bullet performance of any small dia round when driven to subsonic speeds. I'd want a minimum or 35 caliber but preferably larger in dia for taking big game with 1100 fps loads.

i think a 270 or 7mm is max... i agree with paul

headspace on the casemouth? hmmmm....

35-223, 338-223 hmmmm...

I think a 6.5 would be the best way to go.. it would be in a 18-20" barrel..

I get high BC with 120 grains, and can push a 140 grain++ for fun..

Any idea of speeds with a 100-140 grains?

I'm guessing with an 18-20" barrel you could be in the 2400-2500 fps range with 120's, and down around 2200 with 140's. I guess that puts you just shy of a 6.5X54.

Folks have also necked the PPC case to 6.5mm, and get around 2700 with 120's.

Dear Nortman,
I made up a 6.5/223 [TCU] on a little Rem 700 with a Shile barrel and kevlar stock. The barrel is 22 in long and accuracy is flat astounding! With EVERYTHING! The 120 Sierras get right at 2675 fps and work fine for the little Blacktails around here. Accuracy being so good it makes a sweet and pretty quiet short range deer rifle. Good luck on your project!

Aloha, Mark

Hmm.. a 223 necked up to 6.5 shooting a 108grain Scenar, at 2700 fps, is actually better then the 308 m118 round that le/military is using.

It only has 80 ft lbs less knockdown at a 1000 yards.

Less windrift and drop as well..

Bochia: do you remember the OAL of your cartridge loaded with the 120grain?

Im wondering if you could get a 6.5x45 with a 108 scenar into a AR-15 mag?

Dear Nortman,
For my 600 I seat the bullets to 2.440. I back them to 2.890 for the AR and both shoot great as the throating in the two is different. Sorry I took so long to answer but had knee surgery and been down for awhile.

Aloha, Mark

Dear Nortman, BTW! I used to go out with a girl from Kragero [SP] Norway. Anywher close to you? What a girl!!!!

Aloha, Mark

Bohica: Hi, Kragerø is about 5 hours from my house. So not that close.

Ill bet you find someone here from around those parts. But very nice part of the country..

I have a 223 blown out and cut off with 338 headspaces of the case mouth 4 rifles sold working on the ar upper headstamp brass soon
it will be called 338 HB tm

2 bullet weights and speeds 160 gr x at 2400 and 250 gr x at 1050 all from 16 in bbl and fantastic through a supressor

Known as the 338-223?

200grain at 1800fps

Page 196 in cartridges of the world.

quote:

Originally posted by CRUSHER:
I have a 223 blown out and cut off with 338 headspaces of the case mouth 4 rifles sold working on the ar upper headstamp brass soon
it will be called 338 HB tm

2 bullet weights and speeds 160 gr x at 2400 and 250 gr x at 1050 all from 16 in bbl and fantastic through a supressor

I met crusher at DSC .. and looked at that round.. seemed like a neat thing to do with a bolt 223~


Say, can I borrow that reamer? I want to momoblock a HR handrifle and screw in a 338 barrel...

singleshot snotknocker!!

jeffe

yeah you can make one if you like ill loan you my reamer and gauges even give you some brass.
you are not the first guy to build one but hey they are indeed a handy rifle . better to send the 223 bull bbl and have it bored out to 338 1 in 8.5 twist or mono it either way krieger has the bbl specs and is making them as a standard for me.

the 338-223 that is in ctg of the world is a full length case blown out mine is 1.5 and made to fit a standard 223 mag box et ar15 rem 700 they list it as some bs low velocity useless round. Ihave found that with 160 gr x bullets it just shithammers pigs out to 200 and full velocity is in 16 in of bbl very handy. the 250 gr x subsonic is great through a supressor. both loads work great for their purpose.