Is a .315 neck too loose for a 284W?

[Fordnutter]

Hi Guys,
Is a .315 neck too loose for a 284 winchester when using 6.5-284 lapua brass? The Gunsmith has a reamer with a .315 neck & I wondered if this would allow sufficient clean up of a neck without the clearances getting too excessive for a competition rifle.

 

[Cigarcop]

The lot of 6.5x285 Brass I have measures .312 with a 180VLD with no clean up...YMMV

 

[Larryh128]

My loaded round with Lapua brass turned to .013 measures .310. I personally don't think that .315 is too sloppy but others might disagree. Unturned brass should be right at .312 as Cigarcop stated.

 

[expiper]

I use a .316 NK ....the WW brass which I use ocasionally is .313 loaded.....so the lil xtra wiggle room makes me feel more at ease....Roger

 

[Fordnutter]

So say a .315 neck - .004 clearance = 0.311 If a loaded round using 6.5-284 brass measures at .312 is .0005 amount removed from neck turning will this be enough to clean up the necks of the lapua brass satisfactory for consistency?

 

[expiper]

it sounds like your chamber is NO turn.....try a few that way,,,and see how they shoot...Roger

 

[dragman]

it sounds like your chamber is NO turn.....try a few that way,,,and see how they shoot...Roger

thats what I would do. My neck is a .312 and I have to turn my brass (I HATE IT!) nothing wrong with trying it first.

 

[tclaunch]

I had my reamer made with a .315" ND, light clean up for .004" clearance.

 

[nhm16]

I have read elsewhere on this board that you do not need tight neck clearance in .284 Win., and my experience bears that out. Mine has a SAAMI neck (.322"), and I shoot lightly turned (mostly to remove the donut) Lapua brass (.312" loaded diameter with Berger 180gr Hybrid). Gun shoots great, I just have to use a .315" bushing before I use the final .311" bushing (otherwise, the neck will "overrun" and end up smaller than .311" if I just use the .311" bushing). I also have a Bench Source annealer that I use after every firing.