I am going to start this off by saying that if you don't believe what I am posting than join the crowd because I don't either lol. It started off with following yet another rabbit hole with seeing different peoples experiences with altaros slugs and the general take on them was good so I decided to order some I ordered 2 packs In each weight ( 25cal ) so I got them and I didn't like the 50gr (because I wanted more power out of my fx panthera 700mm) and I wanted to shoot the 66gr but they didn't fit in my magazine so I ended up right in the middle at 60gr so i took them and velocity tuned them(850fps recommended by altaros) at home and got my es and sd really tight but i knew from experience tuning to many different slugs (including NSA H&N Patriot Javelins) that just getting your numbers tight doesn't mean that that you're going to get good groups. You have to harmonic tune, so I got out to shoot the first opportunity I had and of course it was raining foggy and some wind so I set and got sighted in at 50 yds and then shot a 3 shot group and it was one of the best 3 shot groups I had ever shot with slugs so I decided to move on out to 100 yds and I couldn't believe how good the 3shot group was especially considering the conditions so I shot a second group and this time I picked up the speed of my shooting because the wind started to pick up but I think it hurt me more than it helped me and for the final group I slowed down again and the results are nothing short of amazing I have spent so much time on tuning different slugs but these I spent almost no time at all and already they are shooting way better than I could've dreamed of shooting my other slugs seeing the results of my gun my Dad wanted me to tune his fx impact m3 for the 50 gr slugs (850fps) and the next day we went out to our other range that has 300yds and we could not believe how good he was hittng all the way out at 200yds and 300yds here are some of the groups at 200 yds pretty windy conditions and here are some at 300 yds pretty windy conditions so here is the information as I said in the beginning if you don't believe any of this trust me I can't either these altaros are absolutely amazing!