Im not calling anyone a liar I'm just saying I dont understand how you guys are getting these velocities 3175 with 77 gr h-1000 and berger 180's. I dont have a lot of experience but Im just running numbersd and comparing data. So tell me how I have it wrong I guess. Heres is what I have.... Comparing other calibers that are neck down according to the nosler 6 reloading manual in a 308 using 150 gr ballistic tips with a max charge of RL15 46.0 you get 2958, with a 7-08 using 150 gr ballistic tips with a max charge of RL15 41.5 you get 2802. Comparing a 300 wsm
vs a 7mm wsm
. With the 300 wsm using a 150 gr bullet using a 150 gr BT using a max charge of RL 19 69.5 you get 3242 fps. Using a 7 wsm using 150 gr BT using a max carge of RL19 64.5 you get 3129. SO looking at a 300 win mag with a 24" barrel using a 180 gr BT over max charge 77 grains of IMR7828 ( sorry no info in there about H-1000) you get 3048 fps. So I just dont see how you get all that extra velocity? Is it the barrel length? Also looking at some other calibers like the 7 STW it can only achive in a 26" barrel using a 175 partition spitzer a max velocity of 3042 75.0 gr of retumbo. The 7 RUM using the same 175gr bullet, barrel 26", can only achive 3164 with a max load of 92.0
gr of Retumbo! So the 7-300 using 77.0 gr can do more than the 7 RUM , which is using 92.0. I know some cases can be more effiecient but wow. Again Im not calling anyone out. I just dont understand how its possible. I believe the people who have posted I just want to understand. And when I understand I will be probably be rechambering a rifle to this 7-300 because it sounds AMAZING! Thank you.