Re: 300 RUM and VLD's velocity ?
I experienced the same disapointment when I run my loads through the chrony. I shot about 6 different kinds of powder during load development. From Re 25 to Retumbo, to H1000. To my surprise the best groups I got by far was from H 4831 and IMR 4831. I played with seating depth in all powders also. My 5 shot groups with these other powders at 200 yards measured around 3 to 4 inches. Both the 4831 powders dropped the 5 shoot 200 yard groups to just a tiny bit over an inch, thus causing me to stick with this powder. I then started my drop data and when I run it through the chrony I was only running around 2900 fps. Shot through the chrony two different days because I thought something was wrong but it was confermed. Oh well I said and I stuck with the accuracy. During load development I stagged my powder weights up till I was seeing pressure signs on the primmer and case head then backed off a few grains till they disapeared. My load for the 300 RUM is 80 grns of H 4831, shooting 210 VLDs with them as far in the lands as they will go without pulling out of the case when ejecting a live round. I'm shooting a 27" Bartlien barrel. Did not shoot any of the other loads through the chrony, therfor I do not know what the Retumbo and Re 25 was pushing the pills to. I feel cheated on the velocity but the superb accuracy outways the disapointment in my case.