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Hi Guys ,
Thinking of building a short barrel boltgun , barrel somewhere between 12-16 inches , and using a tight twist barrel , say a 1-7 , and building on either a Rem700 , CZ527 or a Howa ? , it will use a suppressor , anyone done something similar ?
Cheers Chris
Might have a Cz could sell you , barrel is rooted
Yes , they work very very well
I use 60g nbt and 55g gamekings
Partial neck size only to increase case capacity with lapua match brass and fill it with 2206 :)
@kimjon is the one you want
If you need an action (Rem700) and barrel, let me know.
I need to sell off my 223Maximus and was going to have the chamber set back to 223Rem and sell off, but would rather see it go a more interesting project.
EDIT - This barrel is only a factory 1:10, but the action may be of use to you anyway.
Yup, Been using one for past ten years, about 9.5" barrel, with gunwork suppressor. Pretty much my go-to hunting rifle. Nothing flash, just a stainless ruger, but accurate enough for Bush hunting
http://i964.photobucket.com/albums/a...ps7761e7d2.jpg
Shoot one or two animals with it, using it every day as a culler for a decade. And still use it in my own time now I've retired from professional hunting.
Kj
Just for some perspective on just how small it is...just legal at 765mm without suppressor on.
http://i964.photobucket.com/albums/a...imjon/brno.jpg
Kj
@kimjon what load are you running?
Just factory hornady training ammo (brass cases), but anything cheap works fine as long as it's soft point.
Bloody hell a toothpick is longer than that.;)
my 17.5" cz gets 2800fps with 64gn pills and that isnt even stoaked hot, I am still considering chopping it down to 16"
Shitty pick but you get the size.
Attachment 42989
?? By 0.1%?Quote:
Originally Posted by 7mmsaum
Only gain to be had here is to go for the lightest brass available, and that going to be pretty insignificant at best. Sizing treatment isn't worth chasing IMHO.
In a .223, full length resized lapua match brass and 60g nbt mag fit held 26g of 2206hQuote:
Originally Posted by 6x47
3206fps
Neck sized only and same projectile and seating depth held 27.1g of 2206h
3450fps
If you are shortening your barrel and want some lost velocity back there are a few ways to increase powder capacity, neck sizing is one way, another way is to increase throat lead to the rifling which allows you to make ammo with a longer overall length, again opening up case capacity for more powder
The lightest .223 brass with the largest internal capacity cant normally handle higher pressure, lapua brass can.
Broadly speaking Pressure = velocity in a short tube
Try not to use moly or HBN coated projectiles as pressure is usually reduced, dropping velocity.
The effect in short barrelled 08cases and saums is even more dramatic
Running lapua brass with its .588 bolt face and ..585 base dia shortened to saum length has an even bigger capacity advantage when neck sized only.
When using a .223, and a short tube at that, any extra velocity is welcome.
http://images.tapatalk-cdn.com/15/11...de311e4ea2.jpg
When designing a short barrelled .223 consider the effect your slower projectiles and reduced energy are going to have on your maximum range and the animals you shoot, and rather than running ammo at high pressure levels put some thought into a short tube on a .22PPC or .22XC or 22-250 that will give far better velocity in a short tube, and do it with less brass/ammo prep.
You use the 60gr NBT on deer @7mmsaum ?
Friend uses them and they seem to work great on reds and goats.
Yes they are great on deer, the base of the projectile is 4mm thick copper and is often found just under the hide on the far side.Quote:
Originally Posted by Beavis
40 NBT is exceptional on roos and pretty good on goats, taken the odd fallow with it too with pretty convincing results.
3800fps :cool:
Admittedly from a 24" tube though..
Quote:
Originally Posted by 7mmsaum
The latter is certainly an option to buy more case capacity- more freebore (longer leade) will do that but often at the cost of your magazine being too short to get suitable jump for max accuracy.
I find it very hard to believe that a 1.1gr increase in case capacity will produce anything remotely approaching 250fps vel gain. If you look right down the column of 60gr proj loads in the Hornady handbook, that final 100fps up to "max" needs between 0.7 - 1.1grs to achieve this. So this means you're talking at least 2grs and probably 3grs with other powders to get an extra 250fps.
The only way to get ~250fps will involve changing some other major variables such as powder type.
Am fairly sure the 40g nbt has the same thick copper baseQuote:
Originally Posted by StrikerNZ
Sent from my iPhone using Tapatalk
You're correct on that.. just like your experiences with the 60g, have found the base under the offside skin on more than one occasion.Quote:
Originally Posted by 7mmsaum
Their stubby lil ogive often makes them exceptionally accurateQuote:
Originally Posted by StrikerNZ
http://images.tapatalk-cdn.com/15/11...1ea6216c49.jpg
The velocity loss is of little concern to me for a bush hunting rifle. I've shot plenty of animals with .22wmr, .22hornets, .222 and .223.
Cutting a .223 barrel down will reduce the velocity down to approximately .222 velocities...and this is a proven killer on deer, so in my mind there's no issues providing sensible kill shots are taken.
Kj
Velocity in barrel lengths fom 14" to 9" at 1" increments
223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches | Rifleshooter.com...
