Rcbs neck bushing size

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Nubuun

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I have a set of rcbs gold metal match dies for my 6.5x 47 Lapua. I need a little help/ conformation on my bushing size.
Chamber neck is .295
Projectile diameter is .2644
Brass neck thickness .013( average lapua thickness, may neck to .12 for concentricity)
So .2644 + .013(x2) = .2904
Or .2644 + .012(x2) = .2884

According to the rcbs website you then deduct .001 from that so I was planing on purchasing the .287, .288,.289 and .290 bushings for wiggle room and playing with diffrent neck tensions.

Does all this sound correct? Is there anything I'm missing or that I should add? This is my first experience with bushing dies/ precision reloading.

Does .005 or .007 sound like a lot of room between the neck/chamber, is there any way to resolve this( I was plaing on running A expander thru it before I neck turn so that might tighten that up)

Thanks
 
Ok thank you, I have my brass on order but I wanted to try and order the bushings Sooner then later. If the necks are .015 I'll end up with a tighter neck/ chamber fit whice would be nice
Thanks
 
I prefer to seat a few bullets, and then measure the neck OD with the bullets seated. One measurement produces less chance of error than measuring the neck thickness, then multiplying by two, and then adding the bullet OD.
 
My memory is a little off. Im using a .289 bushing in a Redding die with expander, necks are closer to 14thou. I dont touch the necks and it gives me about 1.5 thou tension. I never bothered turning them, partially because it shoots lazer beams as it is, and turning 500pcs is way too much work!
 
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