6XC-Freebore/OAL ?'s

[SDWhirlwind]

I need some help from you guys! Last summer I had Dave K. grind me a 6XC reamer supposedly for the 105/107 bullet range. Using them LR on coyotes not competition so don't want the 115's. Anyway freebore as per phone conversation and reamer markings is .109. Built 2 for twin brother and I using Rock 5R barrels. OAL runs roughly 2.6" to lands. Was hoping for 3000 with 26" tube. Takes 39gr of H4350 to get there but have fliers and sticky extraction.

Last week I put together a 6x47 L using another of Dave's reamers. Supposedly a standard off the shelf reamer that Dave grinds for the 80-105 range so FB isn't stamped but think it about .090 but would have to look up notes from phone conversation. Well last night I measured and loaded a round and OAL is 2.635". Bullet sets right at shoulder with boattail hanging under so I am satisfied with that. Trouble is the XC loaded at 2.6" has the bullet bearing surface setting BELOW the nk almost to shoulder!

Question is what are you guys OAL for the XC with a 107 SMK? Somebody has to be shooting them! Seems I can find little about the 107 naked???????

HELP!!!!!!!!

Thanks in advance for reading this short story.

Dennis

 

[DTubb]

A .100 straight section in a 6XC reamer with a 3/4 degree lead will let you seat a 115 at 2.740 and be just off of the rifleing and have the full diameter of the base of the bullet in front of the neck shoulder junction.

DTubb

 

[anyrange]

Dennis,
I have a Zero Freebore 6XC reamer which yields a loaded 107 with COL of 2.640 inches. The base or pressure ring on the 107 is right at the shoulder to neck junction. I have measured the and found the bearing surface length on a 115 bullet to be 77 thousandths longer than a 107 bullet.
My plan is to shoot about 2000 107's touching the lands, shoot 1000 115's touching the lands, and finish the barrel with 500 117's touching the lands.
My Zero Freebore reamer has a 1.5 degree lead angle, .273 neck, and is one of Hughs reamers.

 

[rcw3]

Dennis,
I have a Zerobore 6XC reamer which yields a loaded 107 with COL of 2.640 inches. The base or pressure ring on the 107 is right at the shoulder to neck junction. I have measured the and found the bearing surface length on a 115 bullet to be 77 thousandths longer than a 107 bullet.
My plan is to shoot about 2000 107's touching the lands, shoot 1000 115's touching the lands, and finish the barrel with 500 117's touching the lands.

Larry

Your info is only meaningful if we know the throat angle of your chamber, otherwise it's a guess whats going on with OAL, etc.

One of my Henricksen 6XC reamers has a .090" freebore and a one and a half degree throat angle, and a Sierra 107 hits the lands on a new chamber right around 2.695" OAL with one barrel and around 2.708" with another barrel,probably different lots of Sierra 107's account for most of that variation). I will say that I trust Hugh Henricksen's reamer work and dimensions, his reamers are the best I know of and he is very particular in the making of them in all respects. You will wait a while for one of Hugh's reamers but they also cut the cleanest chambers of all the reamers I have.

Robert Whitley

 

[joesr]

Very simple... back the bullets off 40 thou and shoot them. They will shoot great.

Jump the bullet 30 to 100 thou and there is no differce.

Great accuracy!

Try it.

Don't waist your time trying to the the "up close" seating depth.

Just my opinion. Try it.

Joe

 

[richadams]

I has been my experience that 39gr of h4350 in a 6xc with bare bullets is a way hot, way way hot load. I never got past 37gr with 105 amaxes. any way as to bullet seating length do you have a stony point tool? this will tell you where the lands start with any bullet you choose. if not then load a empty piece of brass with a 105 really long paint the bullet with a black sharpie,marker) chamber the dummy round and look at the scratches on the ojive. Yes you can quit laughing now it's way primitive but actually functional. the folks at stony point will bore the primer pocket of one of your fired 6xc cases for a few dollars then you can use the stony point. I know John Holliger is making tubb 2000 barrels and he can tell you what his oal will be on a new chamber if you call him. google white oak precision, or white oak armament he owns both. also I have heard that you can get stoney point stuff from hornady I heard they bought them but I hear lots of stuff thats b.s.