Originally Posted by
r.atkinson
Right, well I ended up going with the viht data and went over the Nosler maximum load.
I got an average of 2850fps when I went up to 66.3 grains. Interestingly enough 66.6 grains had pretty much the same average fps as 66.3 grains did.
I am now in a position where I have used 80 of the 100 pieces of brand new Norma brass. I have neck sized and cut to my desired length.
I have measured my case expansion, new VS once fired brass. On average the cases have expanded by 3.5%.
I know that every rifle is different, but any idea what the likelihood is that my load will not lose, first and foremost accuracy and secondly velocity.
I will more than likely make 3 rounds using 66.3gr with new brass and the same charge with once fired and see what difference it makes on accuracy and velocity.
I will also try a load working up to a 3.5% increase as I now have 3.5% more case capacity. This will mean my load could be 68.6 grains. Although the viht data says the maximum is 68.1 grains.
I am leaving for South Africa for a PG hunt on Tuesday so I have limited time available for another serious batch of load testing!!
Any help/advice would be appreciated.
Cheers
3.5 % more capacity does not equate to 3.5% load headroom.
if you give me the raw water capacity figures I can run a Quickload simulation for you which although in no way definitive, will at least give me some idea based on the velocities you have provided.
What is your barrel length, incidentally?
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