I just got back from my camp with my ptr 91. I tried to sight it in for deer season with 150 gr winchester silver ballistic tips, and to say the least I'm not impressed, I think my ptr doesn't like winchester too much. Now I know some of you guys shoot much further than 100 yrds with better than a 4-5" group. I'm going to stick with the 150 gr because its just so easy to find, but besides reloads (I don't reload), what store bought ammo do you all find groups the best so I have a direction to head to next time I try to fine tune it. Next step is to get me a box of remington and maybe steal a few of my dads hornady sst's and see how they group.