Originally Posted by jimsbriar
I have a question that may generate some discussion. so, I have a sako finnlight 85 in 6.5x55. I have been slowly working up loads using lapua brass, fed 210 primers, 130 berger VLD and IMR 4350.
Max load according to the berger manual is 43 gr. with a published velocity of 2696 fps. at 43 gr. I was only able to get 2417 fps and my high/low spread was 57 fps. so, I kept creeping forward with the charge. Now I am at 46 gr. with a velocity of 2817 fps and a high/low spread of 8 fps.
I still have no visible signs of pressure. no marks on the case head, no cratered primers, no overly flattened primers and no bulge marks around the base of the case.
The gun keeps getting more and more accurate and my high/low spread gets smaller and smaller with every increasing charge. Right now I have 1/2" MOA.
how far should I push this? How good is good enough for those 600-700 yard shots?
thanks in advance!!
Taking a quick look at some different load data sources, it looks like 2750-2800 fps is about max that they all recommend with a 129-130 gr bullet weight but all are loaded to roughly 45,000 to 50,000 psi for the older rifles that the Swede was chambered in. In a modern rifle, this chambering will easily handle modern chamber pressures into the +60,000 psi range easily which will give a noticeable boost in velocity.
You are at the upper range or slightly over what I have found so I would say stay there. Your accuracy is top notch, your extreme spreads are perfect, could not be better. Do not push things any harder and get off paper targets and get out and start practicing with some practical field testing to get your drop chart developed and proven. I would say your load development is DONE!!!