Shoulder bumping

[SkipB]

I hear folks talking about bumping the shoulder back one or two thousandths. How can I do that with a FL die? I`m tired of FL resizing and hopefully I can get a little more accuracy and life from my cases.

 

[BoomFlop]

Use a comparator and measure fired case. Then back your FL die off and work it in until you the comparator shows that you bumped shoulder your desired about. Note: it will usually get longer as the die sizes the base before the shoulder starts to get bumped.

Good luck!
Steve

 

[DoneNOut]

Get a forster neck & shoulder bump die.

 

[moses42ak]

Watch this video:

 

[SkipB]

Watch this video:

Now THAT makes sense I got it now, I`m ordering a set right now

 

[moses42ak]

Start with 10 and work your way to 2. If you start with 2 you'll shove the shoulder way back.

 

[nksmfamjp]

Meh….let me find a video..



The only thing is 0.002" is not right for every action/caliber. You need to size until you find bolt drop +0.001 to 0.002". The bolt minus firing pin and ejector should drop freely or nearly freely. Sometimes the extractor hangs up just a bit.

 

[L.Sherm]

You will find also if you mix your cases up on how many times fired your bump will be all over the place due to work hardening

 

[SkipB]

I anneal my cases by putting them in a shallow pan of water and using a propane torch heating the top of the case a dull red and tipping them over in the water. It makes resizing them much easier is there a better way?

 

[DoneNOut]

You will find also if you mix your cases up on how many times fired your bump will be all over the place due to work hardening

Thats a great point.

 

[DoneNOut]

I anneal my cases by putting them in a shallow pan of water and using a propane torch heating the top of the case a dull red and tipping them over in the water. It makes resizing them much easier is there a better way?

You can dispense with the water. Just drop them on a metal surface and let air cool.

 

[jbs2014]

I hear folks talking about bumping the shoulder back one or two thousandths. How can I do that with a FL die? I`m tired of FL resizing and hopefully I can get a little more accuracy and life from my cases.

A set of shims can help. Put a .001 or .002 on top of the shell holder and screw the die down on top of them till it is tight. Tighten the lock ring, size the case, and then measure and see if you get the desired result. You may want to start with an annealed case to prevent any brass spring back. To prevent case stretching keep the sides of the case well lubed.

I have heard that for hunting rifles .003 setback may be preferable, anybody know if that is the case?

 

[L.Sherm]

.002-.003 is what I shoot for.

 

[Taylorbok]

You will find also if you mix your cases up on how many times fired your bump will be all over the place due to work hardening

Thats a great point.

To add to this point I do find there is the odd case that doesn't fully fire form the same as the rest resulting in a longer shoulder dimension after sizing. I don't measure every case but If I happen to come across one like this I just check if it chambers still and carry on with life. If it happens to not chamber you'll have to measure them all and sort out the long ones then when your done screw your die down until it pushes them back to the same length and then re do anything that is long.