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338-378 load data for 275gr Rocky Mountain bullets

338-378 load data for 275gr Rocky Mountain bullets
« on: June 03, 2018, 01:40:22 PM »
Anyone have any ideas for max charge for retumbo or h1000 for a 275gr Rocky Mountain pill? I worked up load data for the 270gr eld-x with the same powders, since I had no signs of pressure with max loads on each would it be safe to assume the same max? I plan on using Dan Beeberrys OCW so of course Iíll be starting low and working up. Just curious on some outside insight!!

.257

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Re: 338-378 load data for 275gr Rocky Mountain bullets
« Reply #1 on: June 03, 2018, 05:05:21 PM »
First off how are you measuring pressure? If there truly is no pressure than your not at max load in your gun, all guns are different
As for a starting load 5 grains of bullet weight should not change this if you are not having pressure at max charge
Mike

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Re: 338-378 load data for 275gr Rocky Mountain bullets
« Reply #2 on: June 03, 2018, 08:38:18 PM »
Yes I am with .257 on this. You should be fine using the starting load and working up the same way you did with the 270 grain ELD-X's. Couldn't see 5 grains of projectile making much of a difference if you haven't hit any pressure signs with the 270 grainer yet.
Aussie gun nut.

Re: 338-378 load data for 275gr Rocky Mountain bullets
« Reply #3 on: June 03, 2018, 08:50:55 PM »
Max reccomended loads per the books, and just checking for signs of pressure, stiff bolt and checking the primers. Thanks for the help!!!