Short chamber? Ruger long range target in 6.5 PRC

[Anobbs]

Hi there
I am hoping that those of you with a ruger long range target in 6.5 PRC might be able to help me out.
I just picked up mine on the weekend and was surprised to find that when measuring the length to the lands with my Hornady oal gauge - that 0.020 off the lands puts my COL at 2.760 (with 143g eld-x) and 2.796 (with 142g Sierra March kings).
That puts it very close to the SAMI minimum of 2.755 and a long way from the Max of 2.955. In itself that may not be problematic but the bullet ends up being loaded very deep into the case.
Have others found the the ruger has a short chamber or is there something that I am missing?
I have loaded up a variety of test rounds with RL26 and there is no noticeable evidence of the powder bring compressed so far.

 

[Jordanwickham]

I don't have that rifle but the factory barrel on my RPR had 30k jump on 140 ELD-M @ 2.800" but 140 SMKs were 60k jam at 2.800." I don't have any experience with either 143 ELD-X or the 142 SMK but I would think the X is more secant than the SMKs tangent, atleast based off the slightly smaller of those bullets.

 

[Anobbs]

Thanks Jordan,
Did you have any powder compresssion? And how was accuracy?

 

[Jordanwickham]

Thanks Jordan,
Did you have any powder compresssion? And how was accuracy?

So one thing is I didn't read your title well enough. I didn't see that this was a PRC. I'm talking about a CM. As far as my CM went I'm sure I did have compression. This happened a while back. I know that I made a note in my notebook that in a string from 42-44 grains I wrote that 44 had ejector mark, heavy cratering, and the primer looked annealed in the center. These were loaded before I realized that mag length was 60k jam. I found that out afterwards but thought maybe I was getting a bad reading on my OAL gauge I was using and confirmed it when I went to load them at the range. I took them back and seated deeper knowing I had to pay close attention to pressure. The cratering prior to the 44 is common in my rifle but that load was probably a .5 grain from a Pierce. The accuracy was spotty but I was also sitting at 10k jump since I was already at a COAL of 2.720" which is shot as hell IMO. Between the COAL and the pressure I never revisited the bullet. One charge had a really good ( for me ) 5 shot with a flyer OFC. But I'm guessing none of this really factors since we are now not only talking about different rounds and rifles but now different cartridges as well. Not sure what the velocity on these were.

 

[Jordanwickham]

So one thing is I didn't read your title well enough. I didn't see that this was a PRC. I'm talking about a CM. As far as my CM went I'm sure I did have compression. This happened a while back. I know that I made a note in my notebook that in a string from 42-44 grains I wrote that 44 had ejector mark, heavy cratering, and the primer looked annealed in the center. These were loaded before I realized that mag length was 60k jam. I found that out afterwards but thought maybe I was getting a bad reading on my OAL gauge I was using and confirmed it when I went to load them at the range. I took them back and seated deeper knowing I had to pay close attention to pressure. The cratering prior to the 44 is common in my rifle but that load was probably a .5 grain from a Pierce. The accuracy was spotty but I was also sitting at 10k jump since I was already at a COAL of 2.720" which is shot as hell IMO. Between the COAL and the pressure I never revisited the bullet. One charge had a really good ( for me ) 5 shot with a flyer OFC. 3 in one hole, 1 touching, and one hanging out on a beach in Hawaii. But I'm guessing none of this really factors since we are now not only talking about different rounds and rifles but now different cartridges as well. Not sure what the velocity on these were.

 

[Anobbs]

Update for anyone reading this.
Gave the barrel and hire a thorough scrub and put 8 shoots through it setting up the scope.
Following another post shoot clean the problem seems to have disappeared and I am now getting 2.90 COL to touch the lands.
Much happier with this.

thanks for the help