What is shoulder bumping ??

Thanks

for the info...I will trim and see how it goes....cannot order brass until Monday anyway...and I would like to have a few new pieces to give the old rifle its best shot....

I have heard that with old age comes wisdom, but I my case old age came alone..

Thanks again..
 
Used brass from another larger chamber will size down far enough to go in easy, but as you have found it will spring back on its first firing to cause the interference that you are experiencing. Make some new brass and see if you have the problem. If you do, Lynwood will trade your die for one that is smaller at the base. I favor measuring bump based on a case that has been fired with a warm load several times (with no bump). That way you are bumping back from a maximum value, not something less.
 
Hold on a minute here. You said:
The sized cases are reading 1.543 in length using the gauge Harrell's provided and the die is touching the shell holder...
Click to expand...
So, when you got 1.543, that was with the gauge on the case, right? Just to keep the miscommunication down, what does a deprimed, but unsized case measure -- how long?

"Conventional" PPC reamers cut anywhere from a 1.515 to 1.525 chamber. You probably have one of these. It is probably safe to assume a max length of 1.515, so trim-to length is 1.505.

But some of us have reamers made to make a 1.505 chamber. With that, trim-to length is 1.495.

Secondly, when you measure the overall length of a fired case using the gauge Harrell's provided, make sure it is deprimed, but not resized. If it isn't deprimed, you very likely will get a false reading, because the sized case sure will be deprimed. -- Unless you take the depriming tool out. Still, best with no primer in the case for either measurement.
 
Yes

OAL may be the issue...because the man who sold me the rifle and donated the brass saw my post and called me tonight and asked the question about case length.....

He said that when he had the rifle he trimmed to 1.492.....according to his notes...

I am going to trim and shoot again....thanks for all the info...
 
Hank said:
OAL may be the issue...because the man who sold me the rifle and donated the brass saw my post and called me tonight and asked the question about case length.....

He said that when he had the rifle he trimmed to 1.492.....according to his notes...

I am going to trim and shoot again....thanks for all the info...
Click to expand...



HEY, that was a good catch that Charles just made...... PLEASE clarify your OAL measurement. The gage IS NOT to be used for trim-to OAL, it only measures shoulder bump. The measurement is unrelated to actual caselength. Actual case length is measured with NO GAGE and NO PRIMER.

Please assure us that we're just having a miscommunication???

thanks


al
 
No

I am not using the gauge to measure case OAL...just to detemine how much bump is being made...
 
Harrel's Email address?

Does Harrel have an email address?
 
Not

that I could find...they do things the old fashion way: They actually talk to you....

540-380-2683...

Great folks to deal with..
 
For

what its worth...after I trimmed my brass to 1.485" and ran them back through the Harrell's die just touching the shoulder, they all fit with no problems...

Just cannot get any range time lately to start testing loads...

So, I really cannot answer the question but looks like the Harrells will work for me for a long time...

A belated "THANKS" to all those who offered advice and suggestions for my problem.
 
Where too long is bad

Hank, One cause of your sticky bolt after firing could be overpressure loads. A too long of neck can extend into the lands or free bore which is tighter then the neck area of the chamber. This squeezes the distal part of the neck around the bullet greatly increasing neck tension. The bullet takes more force to break free of the neck and pressure can build up rapidly in the chamber leading to sticky brass and even to action or bolt failure. With the cases trimmed to the correct length you should not have this problem. Any time you have to use a mallet to tap the bolt open please think about the possibility of dangerous over pressure. Remember shoulder bump back is measured before and after sizing. Over all case length is measured after resizing. Good luck and don't forget to wear eye protection. Tim
 
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Actually,

I was not completely comfortable shooting when I had to tap the bolt handle to open it but my loads were about 15% under maximum and it was not necessary to do it after every shot..

And I looked at the primers on each case and there was not as much flattening as with other loads I have fired in other rifles...

Hey, I'm 64 so living on the edge is no longer an option; I'm already there:D
 
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