6 ppc cartridge trim length

[shive62]

Got some new brass and was wondering what to trim to. Thanks

 

[Bill Norris]

Got some new brass and was wondering what to trim to. Thanks

Depends on the reamer. Some B R shooters prefer to trim back a few thousandths past the listed trim length. Jack Neary trims his cases back to 1.490 which according to him is .010 shorter than the listed trim length of 1.500.

 

[gunsandgunsmithing]

Got some new brass and was wondering what to trim to. Thanks

Not all the same. Ya really need the chamber print or a good measurement of the actual chamber length and it's a good idea to never get within about .010 of that actual length. Remember too, most reamer prints have a +/- of ,005 on the length.

Here's a handy tool

 

[Kyle Schultz]

Got some new brass and was wondering what to trim to. Thanks

Depends upon the length of your chamber. Based on the print, mine are 1.515". I trim to 1.495" or 0.020"less than chamber length. Good luck.

 

[shive62]

Thanks for the info!!!

 

[dgeesaman]

The way I blow out my Lapua ppc brass, I only get 1.485 overall length so I trim there for consistency reasons.

David

 

[gunsandgunsmithing]

The way I blow out my Lapua ppc brass, I only get 1.485 overall length so I trim there for consistency reasons.

David

That length can vary a lot with fire forming methods though..hence the 1.515 chambers that Kyle mentioned above. Not a big deal really but you do need to measure to know what you have before you can establish a hard number. That's where that tool comes in. We act like it's a lot but .015 is a little over 3 human hairs in thickness. Too long is BAD. A little short won't hurt anything if you clean often.

 

[R.Morehouse]

1.490 and I suggest staying on top of it for your best accuracy.

Regards
Rick

 

[JEFFPPC]

I do not trim new brass for length. I drill out the back of a case and look in with a bore scope after sbout 3 firings to see where I am at. You might be surprised at where you end up at with trim length and lessen the area of carbon build up. I gave up on the 1.490 figure a few barrels ago but I did that for years. Now I am more interested in reducing possible carbon ring area.

 

[Leeman]

I do not trim new brass for length. I drill out the back of a case and look in with a bore scope after about 3 firings to see where I am at.

That's a really good idea, never thought of doing that. Just shows that even after re-loading for 35 years you are still learning!

 

[JEFFPPC]

That's a really good idea, never thought of doing that. Just shows that even after re-loading for 35 years you are still learning!

That's exactly what I thought when a friend clued me in several years ago,lol.

 

[shive62]

Thanks for the reply’s!! I went with 1.495. Gonna shoot the gun some. And see how it shoots.

 

[wildcatter]

I do not trim new brass for length. I drill out the back of a case and look in with a bore scope after sbout 3 firings to see where I am at. You might be surprised at where you end up at with trim length and lessen the area of carbon build up. I gave up on the 1.490 figure a few barrels ago but I did that for years. Now I am more interested in reducing possible carbon ring area.

The advantage of the Teslon bore scopes, I can come in the muzzle with bolt closed on a fired case to get a true reading for case length.

With a .268 nk Dwight Scott chamber to a .262 nk Billy Stevens chamber, I've found 1.490 is much shorter than I need. But I don't think trimming to 1.490 hurts my accuracy. I also think as I clean after every 10 to 20 shots during a match, and use JB on my final cleaning after every match is over, I have had no issues keeping up on my carbon doing so.

Buy I could easily trim to 1.500 with both of those chambers and be plenty short, I just don't see where either hurts in my situation.