Thread: Short barrel 223 build ?

40 NBT is exceptional on roos and pretty good on goats, taken the odd fallow with it too with pretty convincing results.

3800fps

Admittedly from a 24" tube though..

Originally Posted by 7mmsaum

In a .223, full length resized lapua match brass and 60g nbt mag fit held 26g of 2206h

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 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.

Originally Posted by StrikerNZ

40 NBT is exceptional on roos and pretty good on goats, taken the odd fallow with it too with pretty convincing results.

3800fps

Admittedly from a 24" tube though..

Am fairly sure the 40g nbt has the same thick copper base


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Originally Posted by 7mmsaum

Am fairly sure the 40g nbt has the same thick copper base

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.

Originally Posted by StrikerNZ

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.

Their stubby lil ogive often makes them exceptionally accurate

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...