FL sizing and should bump

[Outlaw45]

I'm reloading 308 that has been shot in my GAP rifle. I'm using Redding FL bushing die.

I set the die up as the directions say. Screw down until it contacts the shell holder. When I measure the headspace from a fired case to a sized case, the shoulder is set back .003.

How do I get it sized only .002 or .001? I backed the die out a half turn and it still sizes the case the same. As I back the die out, then the bushing only sizes part of the neck.

What am I doing wrong?

 

[NoFail]

Re: FL sizing and should bump

Are you trying again with a different fired case out your GAP or the same one?

 

[sic65stang]

Re: FL sizing and should bump

Ive done that before Nofail, Got very upset, until I realized what I did LOL

 

[former naval person]

Re: FL sizing and should bump

What are you using to measure the bump? Another thread on here was having a similiar problem...he was using the Sinclair gauge which was giving him incorrect readings.

 

[Outlaw45]

Re: FL sizing and should bump

No I've used different cases.

I use the Hornady headspace gauge. I read that thread too. I think after the primer it struck by the firing pin, a little bit of it protrudes from the cratering of the primer. It may add a .001 or .002 to my measurement of the case.

All my cases measure the same headspace. When I back the die out a quarter or half turn, then less of the neck is sized.

 

[427Cobra]

Re: FL sizing and should bump

Bushing dies do not size the entire neck, decapp fired brass then measure with the HSG(Head Space Gauge) adjust the die for .001-.0015 bump, on Redding Type S dies install the bushing number down, screw the bushing stop all the way down, then back it off 1/8 of a turn to allow the bushing to float, lock it down.

 

[FLIGHT762]

Re: FL sizing and should bump

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Outlaw45</div><div class="ubbcode-body">No I've used different cases.

I use the Hornady headspace gauge. I read that thread too. I think after the primer it struck by the firing pin, a little bit of it protrudes from the cratering of the primer. It may add a .001 or .002 to my measurement of the case.

All my cases measure the same headspace. When I back the die out a quarter or half turn, then less of the neck is sized. </div></div>

This is why you deprime the case before measuring. You'll get false readings from the primer extrusion. You'll also find when tweaking the die in-out to get your .001"-.005" shoulder bump you desire, the die will only be moved 1/12th of a turn or so to get the bump you want. If you back the die off any more than that, you will not be bumping the shoulder back. It's a fine measurement, that's why we use a gauge. Different brands of brass will also be bumped back differently.

I spent a lot of time with my shoulder bump gauge testing different dies and brass getting a feel of what you have to do to get the proper bumping.

 

[Outlaw45]

Re: FL sizing and should bump

Ok dumb question, but how do you de-prime without sizing the case?

Also why numbers down on the bushing? I've heard that before but it doesn't say anything like that in the direction.

 

[427Cobra]

Re: FL sizing and should bump

I use a RCBS universal decapping die, most companies sell a version of there own, the reason for numbers down is IMHO the ridges left from stamping the size on them.