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The rums are built on long actions. Same length actions as regular magnums and 06 etc. The 7 rum was another victim of the slower twist barrel offerings and not continued suppport. The 28 nosler came out at the perfect time with the 180 and 195 grain bullets, barrels for them, and with good and heavy marketing. The plus side of the 28 is the shorter case so as not to run into magazine limitations like the rums but the 7 rum would run right there with or exceed the velocity of the 28 I would think
I ran Quickload for the 7RM with 180 gr Berger VLD and 26" barrel. It shows hitting 2,950 fps with RL26 and 2,995 fps with Vihtavuori N570. You may be able to push it a little bit more or go a little longer on the barrel and you can reach 3,000 fps. But will you find accuracy at there?
The RUM is great. He just said he would prefer to stay away from that length of action. I looked at some load data and for sure think you could hit it with a 26" or + tube in the 7rm. With what I get with my stw with the 175 I think 3k is doable for sure with the 180 in the standard rm. I am sure you can see 3150 or so if you went to the stw.
Yes they are all the same length but they do have differences such as feed rails. There is a difference between the long action, long action magnum, long action ultra magnum.
Don’t really want an ultra mag length action
So... factory 28 nos? 7 saum on a long action? Let’s hear some ideas
7 mag will run them at 3070-3100, 7 Saum 2980-3000, 7WSM 3050-3090, 28 Nosler 3200-3250, 7 RBH 3350+, all out of 26" barrels. These are averages amongst ALOT of build data. All depends on what you want to pay for components and ease of finding components. Run an 8 twist to even get close to the advertised BC.