Creedmoor Overall Length?

Sniffer

Sniffer

CGN Ultra frequent flyer
Super GunNutz
Rating - 100%
44   0   0
Location
Okanagan
Ive just finished loading a bunch of 6.5 Creed for a ladder test in my Ruger Precision

I`m using Hornady brass, IMR 4350 and Sierra 140gr HPBTs

Sierras data states 2.810 C.O.A.L and I`m good (maybe even a fraction shorter on some)

Problem is when I chamber the round I have to ever so slightly force the bolt to close as I lock it down - it feels like the bullet is tight on the lands and thats where the resistance I`m feeling is coming from

Is this normal? Can I damage anything?

I chambered a case with a bullet semi loose (so the bullet was pushed back into the case once it met resistance) and when I measured the overall after removal (2.775) it supports my theory that 2.810 is too long

Thoughts?

Screen Shot 2017-09-25 at 16.02.10.jpg
 

Attachments

  • Screen Shot 2017-09-25 at 16.02.10.jpg
    Screen Shot 2017-09-25 at 16.02.10.jpg
    95.7 KB · Views: 124
Always confirm the throat length of any chamber and adjust your seating depths accordingly.

I like to be 5 to 10 thou OFF the lands.

I would seat your bullets deeper and avoid any other headaches.

Enjoy the rifle

Jerry
 
First check that the brass itself fits into the chamber without the bullet.
We're these cases once fired in your rifle?
Did you already work up a load with the bullets possibly jammed into the lands?
If it does, do what Jerry says. Make a modified case from a once fired case and a few random bullets and measure the Cartridge Base to Ogive (CBTO) using the Hornady OAL Guage, CBTO is the distance from the rear of the case to where the bullet begins to touch the rifles lands. Then like Jerry says seat back off the lands and check for fitment with a dummy round. You can also check by using a sharpie on the bullet Ogive and look to see if the lands make a mark. I think CBTO is generally considered more accurate than COAL.
Generally its safer to seat off the lands instead of jammed.into them as being jammed can result in higher pressures compared to a load that was worked up off the lands.
 
To follow up with this I settled on 2.765 in the end. Forty rounds later and all seemed well (chronograph numbers etc)

I may play around a little more but I suspect this is the sweet spot. Factory ammo at 2.680 is quite a bit off the lands.

Lots to learn with the reloading game for sure......
 
Sniffer said:
Its once fired Hornady brass which has been full length resized
Click to expand...

And did you trim to length after full length resizing? I had to trim my HRN 6.5 brass after the first firing. I measured about 20 of my first 200 cases and one was at max and another was overlength. I full length resized then trimmed them all. I have my sizing die set to shoulder bump 2 thou shorter than chamber size. I tried to get it to 1 thou but I never could get it set there. It was either at the length it came out of my rifle or 2 thousandths or more so 2 thou is where it is. Now they get trimmed every second loading which I have decided is also the best time to full length resize the Hornady brass. Alternate loadings they get shoulder bumped 1 thou less than chamber size. I have no idea what the COAL is since I don't use a mag and I don't care. I load to 8 to 12 thou off the lands, that is the best I can seem to do, and is due to the difference in where the seating die touches/engages the bullet and where the bullet ogive is measured on my gauge. I am still working on testing and finding a bullet and loading which consistently gives me close to 0.25 minute accuracy and I am closing in on it. There are a lot of different bullets to try.
 
Why don't you just try loading them a couple thou shorter and see how they feel chambering?
If no longer have to force the bolt closed you're good to go and if nothing helps no matter how short you load them you may have a brass preparation issue.
Always load a single to test chambering before you build 50 of them for a range trip.
 
You must log in or register to reply here.
Back
Top Bottom