Cold fouled bore 1” high

[DLT]

Took the brake off. First shot way high. And for whatever reason the chronograph did not pick it up. The piece of info i wanted to get and got nothing.
Next two shots on top of each other 2794 2786…. Gotta be something with the bedding/stock. May swap stocks with one of my others and see what happens. Also may try a soft rubber mallet strike to settle it before the next cold one lol.

Redo it, just incase some random reason you pulled it which if you did it wouldn’t have been that bad

 

[Ed kof]

I am dealing with the same thing right now. It’s a Savage Impulse in 308. Cold bore is 1 to 1.5 inch high. After that the next three are half inch group. Did it again twice today with the same results. This stock has an aluminum bedding block. I took the action out and got rid of any sharp edges. Put bedding material in and re torqued. Took it apart later and all bedding pushed out to bare metal. No high spot. HELP! Edk

 

[Orr89rocz]

So i took gun out of the stock. Inspected the bedding block and looked for any indication of contact. There was some film on the aluminum block, not sure if it was left over from the hydrodip process or some clear coat overspray but it flaked off with scratching so i took some fine sandpaper and got rid of it. Carefully put it back together, stock vertical and made sure action was seated and torqued it down. Loaded up some rounds.

Tried again today. Cold and rainy 39 deg lol no brake. Magnetospeed captured all 3 tho
2766, 2758, 2750…so first shot was actually faster and was only slightly higher this time. Not quite as far off, seems more reasonable. Shot at the same target from last time. Next two on top of each other. Put the brake back on, fired two in same hole basically on another target. So we shall see if that holds true next time out. Might have been bedding?

 

[Ed kof]

In my 308 mentioned above I dropped to a 150 grain instead of the 168 and problem pretty much disappeared. Doesn’t help with the 168 but for killing deer and such a 150 will do that. Edk

 

[Bill Norris]

I have seen just swapping bullets eliminates the cold bore issue.

 

[ebb]

I have a Ruger 77VT in 308, Jim, Donny and i bought them all at the same time, only Donny's is a 223, It is the opposite, at 100yds. It always shoots the cold bore shoot dead in the middle of the bulls eye and the rest will eventually make a pretty crappy group. I always figured it had stress in the barrel and as it got more and more heat in the barrel it shot worse. I will trade with you anytime you are ready. I hadn't shot it in months and last range visit dead middle bulls eye.

 

[Orr89rocz]

I have seen just swapping bullets eliminates the cold bore issue.

I tried my 165 grain tipped gameking load the other day and i didnt see cold bore shot near as bad. Only 1/3” or so higher. But since the bedding check, the issue hasnt been near as bad with the 180 berger either. Maybe i fixed it. Idk

 

[David Milisock]

Agree. And I have seen barrels have the "cold bore" disease with a certain load but swap over to a different bullet and it disappear as well.

I have a shit ton of old sporterized military rifles and some factory rifles that have what Iv all 3 shot syndrome. I've taken a great deal of time to fouled/cold bore sight these rifles. The print great groups and are 300 tob500 yard game rifles.

The 4th and follows shots suck, however I can't remember ever when in the field they've been a need to fire more than once.

I pick 3 and I'm working on barrel pressure point and bedding tests just to entertain myself.