142SMK, 6.5 Creedmoor .072 Jump?

[KevinU]

Buddy sent me some 142SMK's to try on my 6.5CM.

From what my Hornady OAL guage is telling me, going to have a minimum jump of .072 to keep the bearing surface on the neck. AM I wasting my time working up a load up with that much jump?

Thanks

 

[Rob01]

Re: 142SMK, 6.5 Creedmoor .072 Jump?

SMKs usually don't mind some jump. Try them out.

 

[dvdt]

Re: 142SMK, 6.5 Creedmoor .072 Jump?

What? That seems like a pretty long jump. What's up with the barrel/chamber ? Erosion?

 

[KevinU]

Re: 142SMK, 6.5 Creedmoor .072 Jump?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dvdt</div><div class="ubbcode-body">What? That seems like a pretty long jump. What's up with the barrel/chamber ? Erosion? </div></div>

Ya' that is a long jump. I was surprised as well. Using OAL guage, came up with 2.887 OAL with the SMK's. The top of the boat-tail is well inside the neck.

Guessing the boat-tail at .220?, will be loading at 2.815. I'll give Sierra a call tomorrow to get the exact dimension on the boat-tail.

140amax measured 2.840, 139 Scenar 2.820. Load both of these with a .015 jump, both very accurate.

Are you shooting a 6.5CM?