6x45 (6mm223) - Remington 700

[killshot44]

A mandrel works fine, you're only bumping it out two hundredths.

[ExtremeX]

I'm thinking of just using a Redding FL Sizing die which has a tapered expander...

Could you link me to an example of the mandrel you are talking about? I don't know what that is, but i'm visualizing something like the Lee collet neck sizing die.

[kendog4570]

I'm thinking of just using a Redding FL Sizing die which has a tapered expander...

Could you link me to an example of the mandrel you are talking about? I don't know what that is, but i'm visualizing something like the Lee collet neck sizing die.

Here is one type.

http://www.kmshooting.com/catalog/case-neck-expanding-tools/expand-iron_complete.html

[edgerly779]

i have 33 rounds of 6 x 45 once fired cases primed and sized and 100 grain psp bullets for 11 bucks shipped . I am in sfv. I picked them up in a mixed lot of components.

[Khromo]

I'm thinking of just using a Redding FL Sizing die which has a tapered expander...

Could you link me to an example of the mandrel you are talking about? I don't know what that is, but i'm visualizing something like the Lee collet neck sizing die.

Thanks for the help, guys!

Here is the die and expander mandrels. They help achieve consistent neck tension. A lot of sizing dies seem to get my necks too tight to turn on a neck turner or case trimmer mandrel, and these loosen the fit a little.

http://www.brownells.com/reloading/case-preparation/neck-turning/turning-amp-expander-mandrels/sinclair-neck-turning-mandrel-prod33136.aspx

http://www.brownells.com/reloading/case-preparation/neck-turning/turning-amp-expander-mandrels/sinclair-generation-ii-expander-dies-prod38807.aspx

For anyone else that has a spare AR upper on hand and might be interested, here is a 1-8" stainless HBAR on sale!

http://www.midwayusa.com/product/644186/ar-stoner-barrel-ar-15-6x45mm-6mm-223-remington-hbar-contour-1-in-8-twist-20-stainless-steel?cm_vc=ProductFinding

[dfletcher]

I have a Remington 700 with a 223 bolt face I want to rebarrel to a 6x45...

Does anyone here have a 6x45 they use primarily for target shooting. I wont be using this rifle for hunting, paper and steel punching only. Generally shooting between 200-800 yards...

Which barrel manufacture did you pick, what length did you finish the barrel at, and which twist rate did you choose?

On the Hodgdon load data site I am seeing bullet weights from 60 to 100 grains.

I shoot 105gr Amax in my 243, but I suspect too heavy might not be that great of a choice either... not sure what is a good mix between BC and velocity.

Any pointers?

Ken Breda (kendog4570) referenced putting mine together and it's a very accurate shooter. Haven't played with it much but I tend to use 60 and 75 grain Hornady & Sierra, BLC, 322 & 335 powder and IMR 4895 & 4198. I generally shoot 100 yds and "3 shots, one ragged hole" is about as well as I can do with anything. I use Hornady or Lapua brass to neck up and neck size only.

I grabbed an 18" McGowan Gold barrel on the cheap (about $100.00) and had it turned down from about 1.2" straight diameter to about .925 - Ken may recall better than me. Not sure of rate of twist.

Mine's in a basic HS stock. For something a little different I bought an AR 15 "bottom metal" set up from Pacific Tool & Gauge, they're in White City, OR and I visit there often. The setup is supposed to be "drop in" - and it almost was. Sometimes the bolt didn't pick up the round because the mag was topped out against the underside receiver rail. On a trip up I visited PTG & their fix was to cut a 60 degree cut to the underside of the rail, allowing the mag to sit higher. Works great now, the gunsmithing details are on their site.

I know having a mag fed 6X45/223 isn't exactly the most useful rifle to have, but it's accurate and a 700 with a BetaMag is a bit different.

[buffybuster]

Thanks everyone for the information... I think I am going to move forward with a 6mm barrel purchase and have my R700 reworked.

I will be ordering the dies this week so I can get a jump start on the brass.

I already have some 87gr VMAX, 105gr AMAX, and 105gr BTHP I use for my .243 Win, but ill pick up some 95gr match bullets based on buffybusters recommendation.

Make sure you get a 8-twist or faster barrel to shoot the 105's.

[ExtremeX]

Copy that... this is where I am at so far...

Bartlein 6mm 5R 1:8 twist and finished at 26" (for use/testing with 75gr to 105 gr)
I don't know where I would end up until I do my load dev.

Barrel contour is tripping me up... I haven't seen or held many of these in person and not sure what to expect from a weight / balance standpoint.

I am thinking something along the lines of:
Medium Palma
Heavy Palma
M24/M40
Remington Varmint/Sendero
MTU or Heavy Varmint (always wanted a "truck axle" barrel but I don't this would be the right pick)

I currently have two different stocks I can use... one is a Bell & Carlson M40 and the other is an AICS chassis...

I assume I can fit the heaviest contour possible in the Accuracy International chassis, but at this point I am not sure which stock I would use, so I need to make sure it fits in the B&C M40.

Thoughts?

[ar15barrels]

Barrel contour is tripping me up... I haven't seen or held many of these in person and not sure what to expect from a weight / balance standpoint.

I am thinking something along the lines of:
Medium Palma
Heavy Palma
M24/M40
Remington Varmint/Sendero
MTU or Heavy Varmint (always wanted a "truck axle" barrel but I don't this would be the right pick)

I currently have two different stocks I can use... one is a Bell & Carlson M40 and the other is an AICS chassis...

I assume I can fit the heaviest contour possible in the Accuracy International chassis, but at this point I am not sure which stock I would use, so I need to make sure it fits in the B&C M40.

Easy choice.
The only one of those barrel contours that fits in the B&C stock without inletting work is the Remington Varmint.

[ExtremeX]

Easy choice.
The only one of those barrel contours that fits in the B&C stock without inletting work is the Remington Varmint.

[Catman]

Grizzly stocks Bartlein barrels. Here is a link.

http://www.grizzly.com/products/6mm-243-5R-1-8-Twist-26-Finished-13-Barrel/T10480

[Khromo]

...Does anyone know of a place that might have some 6mm barrels in stock?...

http://www.midwayusa.com/product/644186/ar-stoner-barrel-ar-15-6x45mm-6mm-223-remington-hbar-contour-1-in-8-twist-20-stainless-steel?cm_vc=ProductFinding

These AR barrels in 6x45 are still in stock, and on sale. Maybe you should assemble an AR upper and start getting familiar with the cartridge.

Then after you build your bolt with a Bartlein, you can write up a range report comparing the performance of the two platforms. Lots of details, pictures, data, jokes, the whole deal.

We need more interesting threads in this sub-forum!

[kendog4570]

Southern Precision has some.

http://bugholes.com/index.php?route=product/category&path=88_89_93

[hmhoshino]

Check out Spartan Precision Rifles in San Jose, CA the # is 408-451-9850.

[ar15barrels]

Just for argument sake, if I intend to use this with the AICS chassis, which contour would you have recommended?

The purpose of this rifle is more of a bench or prone range toy than anything else. I won’t be lugging it around hunting or running a rifle course with it either. Then again I wouldn’t want it so heavy that it becomes unwieldy and or ruins balance.

If it's only a bench gun, the weight and balance really don't matter.
If you want to sling up with it, then the balance matters.

The AICS already ruins the balance.
I would still go with a Remington Varmint.

Bartlein's 3B would not be bad either and SPR has them in stock:

http://bugholes.com/index.php?route=product/product&path=88_89_93&product_id=623