Lee collet die

buck52 · #1 07-14-2010, 03:42 AM

Hi
Decided to get some reloading done for my .308.
I have serviced my collet die, polished lubed etc but when I return the press handle to the top I have to push like hell to get the mandrel to come out of the case, I have the die adjusted so that I have just enough neck tension without undue pressure, any suggestions please.

PS. Just measured the case after sizing, the inside measures .300, thats sizing a bit tight for a .308 cal is'nt it?

justgoto · #2 07-14-2010, 04:48 AM

Quote:

.300, thats sizing a bit tight for a .308 cal is'nt it?

I've read somewhere that the elasticity of the case is about .002. If you were to size it down to say .304 then set a bullet measuring .308, pulled the bullet the case would then measure .306 due to elasticity.

So, I would think that you would only need to size it to just under .306 at the most to obtain sufficient tension. Both my 30-06 and 30-30 mandrel are .306.

buck52 · #3 07-14-2010, 05:30 AM

Thanks, I thought it was a bit tight, how do I regulate/set up the tension?
My ammo is only used for hunting in a bolt action.

justgoto · #4 07-14-2010, 06:02 AM

Quote:

Originally Posted by buck52

Thanks, I thought it was a bit tight, how do I regulate/set up the tension?
My ammo is only used for hunting in a bolt action.

It seems to me that your mandrel is too small. You should not be able to get the case mouth to that small of diameter. It just seems that something other than adjustments are to blame.

You didn't happen to disassemble other dies also, then get parts mismatched?

buck52 · #5 07-14-2010, 06:19 AM

Quote:

Originally Posted by justgoto

It seems to me that your mandrel is too small. You should not be able to get the case mouth to that small of diameter. It just seems that something other than adjustments are to blame.

You didn't happen to disassemble other dies also, then get parts mismatched?

No, only got one collet die, i did polish the mandrill with 1500 grit.
I though the max tension was determined partly by the fingers of the collet coming together.

Aldon · #6 07-14-2010, 10:53 AM

No matter how tight the diameter it should not be that difficult to remove the mandrel.

It sounds like you may be fighting a vacuum.

Are you sizing the necks post primer?

I had similar situation although not as exacerbated and now prime my brass after initial neck sizing with collet die.

The collet die uses both the collets and the mandrell to size the necks.

Jinx-) · #7 07-14-2010, 12:34 PM

I guess they are good, all depends on how thick is your brass and how big is you firing chamber I posted in the similar thread just watch out for Lee...

Lee Collet die questions