Henry 1,
I would suggest taking standard or high velocity 22 l.r. ammunition (40 gr. bullet) that is the most accurate in your rifle and cutting a 1/8 to 5/32 flat nose on them. The best tool to do this is made by Hanned precision.
Their website indicates they are effective at 200 yards......
"Hand-Made SGB Ammo-- These little guys automatically adapt themselves to the conditions of the strike. The flat point is large enough in diameter that it produces a pronounced "slap" on impact, which under quiet conditions is audible even at 200 yards (and are effective at that distance too). The flat point, in passing through the animal, transmits a wide shock-front which disrupts the function of internal organs without the massive meat damage typical of HP ammo (h.p. ammo won't expand at 200 because of the reduced velocity at that distance.). No mushrooming is needed to produce this high-shock impact, yet the effect is strong enough to anchor small game and small varmints out to well beyond any distance at which you can reliably achieve a body hit on them."
http://www.hanned.com/sgbtech.htmlI have shot a number of bullets modified with this tool out to 100 yards and they definitely work well. I have fired some at 200 at targets only and accuracy is good.
I first read about this 10-15 years ago. The author described the terminal performance of this flat nosed .22 bullet on jackrabbits. He described the audible "slap" of the bullet and the fact that most of the jackrabbits he hit expired on the spot, or close to it. According to him, these were much better killers on that animal as compared to .22 l.r. hollow points because jackrabbits hit with them usually ran 50 yards or more before expiring!
Impressive!
Have fun!
w30wcf