Reloder 26 will likely get your best speed of those listed. Normally you get 20-40 fps per inch, and I achieved 3060 with hbn coated 180's and 3015 with naked 180's in a 26". If we cut this barrel down to 24", we would get about 2980-3020 with the same load, or 2935-2975 with the naked bullets. I would think you would be able to break 2900, possibly even up to 3000 with 180's and Reloder 26, depending on where your best accuracy is and how fast of a barrel you have.So Ive experimenting with 180 hybrids and 180 ELDM's. I've been using Retumbo thus far and only getting around 2860 at even 72.2 grains which is way over max. I have a 24" barrel so I'm guessing I don't have enough barrel length and am just wasting powder the higher I go. I do have a pound of H1000 but everything I read it will have a slower velocity than Retumbo. I'm wondering what I should try next thinking maybe RL26 or 7828 SSC. Any advice would be appreciated. Thanks