I have just bought a HW 77 in .177 second hand. I won't have it for a few weeks. Don't know if it had been tuned or not. I've been thinking through all the options if it needs work. Because of the law where I live I can only have it on a fac. If I was replacing the main spring how many ft lbs should I go for to achieve optimum accuracy at the longest range possible?. Or maybe what I should have asked, is there any point going over 12 ft lbs .I mainly plink for fun @ 25, 40 and 70 yrds and control the occasional vermin that visit my garden.