DOUBLE RIFLE REGULATION-COLD BORE VS. HOT BORE

[Longrifle]

I have a question for the DR shooters. Has anyone experienced an increase in impact spread from their double rifle when the bores become hot vs. cold bore shots. With most bolt rifles rifles, there is a difference in impact between cold bore and hot bore; usually point of impact will be higher. With my Rigby .450 NE, my cold bore shots are perfect (less than a 2" spread for cold bore). As the bore heats up, by my 4th shot, the spread increases to about 4". Still acceptable but, I want to see if this is normal. With my .470 NE, I did not experience this difference because it never regulated better than 4" anyway.

 

[uplander01]

Experienced similar things with my old english double. Lots of things play a part, heat, fowling, shooters fatigue. Generally speaking it's the first two that matter most. My rifle is parallel regulated and generally throws the left a little further left and right a little further right as the barrels heat up. Tip the rifle up after every couple shots , let it cool off a little and try and shoot 2 times at a time with barrels at similar temp......

 

[KJE81]

I have only had shifting convergence when the barrels goes from cold to hot with my three double rifles, but they are finicky little things so I would not be surprised if there were those that shift when going from hot to cold aswell.