What to do?

[slikmrc]

Need to put that book on my list, thanks

 

[jpd676]

Each time you sent the gun back, how long did they take?

Jason

It took about two weeks each time. They do have good CS. The biggest pain was trying to get a company to ship the rifle for me (I live away from most things).

 

[tobnpr]

I do have a Lyman bore scope. I know it's not the best tool, it doesn't get used that much. I did clean the barrel a little extra this time. When I ran the bore scope, I didn't see any copper in there.

I have the Lyman also, and it serves my needs well- I've got no complaints, better than the Teslong I had.

You need to focus on the throat geometry. Position the mirror directly over the beginning of the throat- where the lands begin at the end of the freebore. They should all be perfectly concentric, and symmetrical. It's easier when I do it to check when I'm chambering, as I can leave the scope stationary and rotate the barrel around it- just harder to keep all in focus while moving the scope around the diameter of the bore. Snap some pictures to the SD card and upload them here so we can take a look. A very well known smith uses a low magnification jeweler's loupe for this which also works well- just looking through the loupe into the chamber highlights incorrect geometry but this method is for dismounted barrels.

I tend to think this is just a "more load development"/change powders/change bullets situation- but lets rule out any issues with the barrel itself to eliminate that possibility.

 

[Wildfire15]

Are you sure it's not the gun? I had to send back a TI summit and am mpr. CA rebarrel end and now they are great

 

[cornchuck]

Are you sure it's not the gun? I had to send back a TI summit and am mpr. CA rebarrel end and now they are great

Yeah, that I don't know. I have a couple boxes of factory ammo coming I'm going to try. If it doesn't group with them, I thought I would send it back to get checked out. I even thought of sending the scope back to the factory to have it checked out also. I'm not out anything but shipping.

Jason

 

[Rosebud]

It took about two weeks each time. They do have good CS. The biggest pain was trying to get a company to ship the rifle for me (I live away from most things).

I have a Christensen Arms Mesa in 300 PRC. I bought it brand new and did the recommended barrel break in from Christensen. The only thing I changed was the muzzle brake from the factory radial brake to a self timing 5 side port brake from MuzzleBrakesandMore. As I was doing the break in, I also was fire forming new Lapua brass. After I got that done, I started load development at 100 yds. Load development consists of Barnes 190 LRX and Hornady 190 CX. Both are all copper bullets with H1000 and H4831sc. Doing load development for an upcoming Aoudad hunt. I even tried Hornadys factory 190 CX ammo. I CAN NOT get anything to group. Its more like MOB. Minute of Barn. There are 239 rounds down the barrel. I have checked the scope rings, base, and action screws. Everything seems up to spec. This is the first rifle I can't get at least moa at 100 yards. Does this warrant a return to Christensen to have it checked out? Or is there something else I need to look at?

Jason

How did it shoot during breaks in.when you were using regular C and C bullets.

 

[ofdscooby]

I would say it's the bullets. I have been through hell trying to get monos to fly out of my .280 ai I built just for hunting here in California and it sucks. I'm messing more with neck tension now and getting close but it's a grind nothing makes sense. One thing I stopped doing was chasing weight look for bullets comparable in length. And start .030-.050 off regardless of brand. The best mono combos I have seen so far are 30-06's with a 165 grain CX and H4350 and a 6.5 creed with 127 LRX and H4350 those seem to be good mono performers.

 

[cornchuck]

How did it shoot during breaks in.when you were using regular C and C bullets.

Not the best. I just attributed the poor grouping to me just throwing a load together for barrel break in and fire forming brass.

I would say it's the bullets. I have been through hell trying to get monos to fly out of my .280 ai I built just for hunting here in California and it sucks. I'm messing more with neck tension now and getting close but it's a grind nothing makes sense. One thing I stopped doing was chasing weight look for bullets comparable in length. And start .030-.050 off regardless of brand. The best mono combos I have seen so far are 30-06's with a 165 grain CX and H4350 and a 6.5 creed with 127 LRX and H4350 those seem to be good mono performers.

I always wonder if it was the copper bullets. That's why I'm going to try regular pills.

Thank you fellows for all the input.

Jason

 

[Rosebud]

Not the best. I just attributed the poor grouping to me just throwing a load together for barrel break in and fire forming brass.

I always wonder if it was the copper bullets. That's why I'm going to try regular pills.

Thank you fellows for all the input.

Jason

Sometimes you have to send a problem child back to the builder. CA will make it work. Bought a Mesa in 6.5CM for niece. It shoots great. Shooting 130 Sierra tipped game Kings. H4350. Wish I could be more help.

 

[Bob Wright]

I would say it's the bullets. I have been through hell trying to get monos to fly out of my .280 ai I built just for hunting here in California and it sucks. I'm messing more with neck tension now and getting close but it's a grind nothing makes sense. One thing I stopped doing was chasing weight look for bullets comparable in length. And start .030-.050 off regardless of brand. The best mono combos I have seen so far are 30-06's with a 165 grain CX and H4350 and a 6.5 creed with 127 LRX and H4350 those seem to be good mono performers.

My 280AI was the same. It had a tight neck. Went to .003-.004 neck clearance after turning and .060 off the lands. Way better.