Finally made dummy 6XC cartridges and sent to reamer maker...

[BOB LEE SWAGGER]

I "loaded" up 3 dummy 6xc rounds and sent them to my reamer maker. I sent a 105hybrid, a 108bbt and a 115 DTAC. I kept the bottom of the bullet above the neck shoulder junction. The recommendation on the print was .230, based on the shortest freebore measured. Did I seat the bullets way too long? Previously I have used this forum to ascertain the correct specs for a reamer and that has served me well. For the 6xc the standard recommendation is .9 - .148, do you see any way that a .230 will work or will I be out of options when the lands erode? All advice welcome!

 

[Patch700]

When you say you seated the bullets to the neck shoulder junction are you meaning the actual heel of the bullet OR the portion after the boat tail.. If you are seating so that the butt or heel of the bullet is flush with neck shoulder junction this could be why your numbers come up long Bob.

 

[BOB LEE SWAGGER]

Yes I seated the heel above the neck shoulder junction. Mistake? I had gleaned on this site that some of the world's best dasher shooters had kept everything above the NS junction.

 

[Patch700]

I would wait to hear from someone here who has spec'd that same caliber with those bullets... But going by your numbers bob it's very plausible that the boat tail length on those bullets is very close to the same number that your seeing as the extra length in your print , aprox .100"

 

[Frankr]

Bob I am no expert but in my new rifle i'm using the 6XC II chamber LT I like it shoots GREAT ! I have seen a few other guy's running that chamber and they shoot GREAT. I think you are over thinking it.. I think .230 is way TOO LONG
For normal unless you are trying something for fun.
get the 6XC II die if you go with that reamer.

http://www.6mmar.com/6XC_II.php

 

[savagedasher]

I think the top of the boat tail should forward of where the donut can forum. Larry

 

[TAJ45]

I'll be making the XC case from Palma 308 Lapua brass and plan on leaving the neck pretty long, say in the .350-.400 range unless I'm dissuaded. My Bud has throating reamers to accomplish that. It will keep the turbulence point buried that much further from the throat, allow me to go with less free bore to shoot some middle wgts any place I can find a node, seating depth wise.

His experience was a 6mm Rem AI'd had considerably more bbl life than a .243AI and he attributed it to the long neck. A very, very seasoned, thinking shooter - so I'm of the opinion that it should work well. We'll see.

 

[tclaunch]

I "loaded" up 3 dummy 6xc rounds and sent them to my reamer maker. I sent a 105hybrid, a 108bbt and a 115 DTAC. I kept the bottom of the bullet above the neck shoulder junction. The recommendation on the print was .230, based on the shortest freebore measured. Did I seat the bullets way too long? Previously I have used this forum to ascertain the correct specs for a reamer and that has served me well. For the 6xc the standard recommendation is .9 - .148, do you see any way that a .230 will work or will I be out of options when the lands erode? All advice welcome!

Short answer, yes they are to long. your numbers .9 and .148" are from Whitleys site, do you not accept these numbers and his research? If you want to shoot the 115 Tubb wich is a great score bullet, I would add .030" to a .178" freebore so there is no bearing surface in the area where the donut forms. The .148 will be fine with the Hybrid. The 108 shoots great jumped .020" so the .178" might be best there too.

 

[dantiff2]

My reamer has .093" free-bore. This puts a 105 HVLD at perfect depth when I'm .025" off the lands. The bearing surface/ boattail junction of the bullet is just ahead of the shoulder/body junction of the case. It would be ahead of any "donut" that would ever form after a little throat erosion.

Dan