243 5R

[joness]

I have a .243 Ackley with a Krieger 5R barrel. I am using Quickload to calculate optimal barrel times. Quickload is out by about 70fps from my chronograph results. I am also concerned about the pressure data I am getting due to this error. Are my pressures higher or lower than stated. I am trying to enter the most accurate data possible to see if this improves my results from Quickload. The cross sectional area of the 5R rifling I expect to be different from the standard rifling profile in the software which is 0.0453 square inches. Can anone tell me the cross sectional area of 5R rifling in .243????

 

[cummins cowboy]

how does the barrel shoot?? I just ordered a 6mm krieger 5r barrel in 8 twist.

 

[tdking]

You didn't say whether the velocity was higher or lower than the Quickload data, but I will assume it is higher. This is not uncommon with 5R barrels in my experience. I have had a couple of Obermeyer 5Rs that would shoot much faster than the expected velocity for a given load.

My old 1000 yd rifle was a stock 30-06 chamber in a 28" 5R. I could push 200 grain Sierra MKs at 2880 fps at max pressures. I routinely shot the rifle at 2775 fps with the 200 grain MKs. The rifle shot lights out at 1000 yds, But is should have as the velocity I was getting was similar to a 300 Win Mag with 200 grain bullets.

YMMV,

Theron