vertial strings

[cheek9075]

i have a new 6 br. it is a remmington 700 action that i have had, i barreled it with a kierger. 6 mmbr camber.
i have a load with n135 30.8 gr, 75grv-max, fed 205m primer, seated .010 into lands.
it will shoot first 5 to 10 rounds inless than a 1/4 inch. but when the barrel gets hot it starts shooting with a verticle climb. the more i put down the barrel the higher it shoots. when the barrel cools back down it will cut holes.
h-s stock bedded, nothing touching barrel, tasco custom shop scope 8-40x56. this scope is one that i have had for years on different rifles, i can cut the dot at 100 yards move scope 10 clicks up and 10 to right, back down 10 clicks and to the left 10 and it always repeats. i don't think it is in the scope. i don't think it is the load. what else is there.
shooting off sonclair rest with sand bag, on concrete bench.
what could it be.

 

[LHSmith]

What barrel taper?
How's the barrel look fouling-wise?
What's the intended use of the rifle?
Heat waves off the barrel...put on a mirage shield
It is never good to allow barrel to get real hot.

 

[cheek9075]

rifle is going to be varmit, hunting.
no fouling i cleaned it 2 times in 50 rounds. barrel is not getting real not, 20 rounds in about 10 min or so. real warm to touch but not hot. i have got barrels alot hotter than this one,and not had this problem. barrel is heavy barrel don't know taper of barrel right off hand.

 

[LHSmith]

Who did the bedding?
Did you try different torque on the action screws?
Do you have mirage shield?

 

[cheek9075]

gun smith that has done work for me before. i have a 6 br that was cut with the same remmer as this one. shoots great.
did not has shield, got one but did not use it, not to bad today, temp is great right now, mid70s at the 4th of july in southwest va, it's usally in the 90 with reel high humidity, almost unbarable this time of year. not much wind. wind flags were almost dead at shooting end.
didnot try different torque on action. just made sure is was tight,

 

[LHSmith]

Try a mirage shield next time. I make mine from a window blind slat. A simple piece of paper or cardboard will work....run from the front of scope to just before end of barrel.
Heat is emitting from barrel and distorting the target, the bull as you see it is not really there.
Even though Kreigers are stress relieved, sometimes internal stresses still come into play,and you may have to resort to means to keep the barrel temperature down.

 

[shooter65]

http://www.6mmbr.com/verticaltips.html

 

[cliffy]

Vertical rising is normal with a rapidly heating barrel. So long as left and right deviation remains constant, merely allow the barrel to cool between shoots. The hotter the WEATHER, the quicker a barrel heats. Today, I fired 65 .223 rounds in two hours at 68 degrees Fahreheit. I'd not attempt this feat at 100 degrees! Ambient temperature dictates rapidity of fire. cliffy

 

[cheek9075]

what are ways to reduce barrel heat, i think this is my problem. what else is there except to let the barrel cool on it's on. my ppc and other br does not have this problem.

 

[LHSmith]

I use a damp towel on barrel if shooting in high temps on match day, and keep my ammo in a cooler.
Is this problem barrel thinner in contour than your others?

 

[cheek9075]

yes it is thinner than my others, it also has muzzle brake on it. i think it is heat, but have never had this problem before. even with my 22-250 which heats up fast.