Re: Help - 7mmUM Load Development
I went throught his recently as well so you are not alone. As far as overall length, you can have a local smith put in a wyatts extended mag box, which will allow you to seat out and still stay in the box. I believe that the factory barrels came with a 1/10 twist, which I believe was another factory mistake. Remingtons vision, obvious by the majority of factory loads, was to be able to shoot the lighter 140 to 160gn bullets at very high velocity. I think that Remington screwed the pooch on this, as the Ultra Mags really excell with the heavier bullets, which require faster twists. First of all though, check your twist and let us know, as that will help us help you. Mine has a 1/9 twist and loved 175gn partitions with H-1000. Would not shoot the 162 A-Max's or the 175 SMK's, so now it is getting a new barrel.
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