About 68gr to 70gr or so???Start with the Berger seating depth test to find your best OAL. Then, load 140 class bullets with enough Retumbo to reach 3150ish from a 26" barrel. You will find your sweet spot there.
are you, by chance, dusty from Colorado springs that left the review on midway for the 127gr lrx? just curious, you don't have to answer if you don't want to. gun)Another load I have found and used is the Barnes 127 LRX driven by 70.1 grains of Ramshot Magnum. 3477 FPS with my Magneto V3. Western Powders lists this load in their load manual but with a 129 Hornady, I didn't have any so I substituted the Barnes.
This load is fast and accurate from my Extreme Weather Model 70
Thats No joke.!Based on conversations I have had with other .264 owners, there seems to be a lot of variation in .264 WM chambers. I'm not sure why. Moreover, I haven't seen book data that comes anywhere near real world results from the .264.
Because of that, I recommend that you treat the .264 pretty much like a wildcat and develop your own data. My advice is to start with Hodgdon data. Work up from minimum (59.7 grains) in 1% increments to find max in your rifle.
In my rifle, 69.3 grains of Retumbo put me at 3160ish in a recent production Winchester Model 70, with plenty of headroom below max. I know of another forum member who is reaching max around 66 grains with 130's, so I would advise caution in regards to your starting load.
I shoot 140 gr accubond with 69 gr rl 33. Getting 3170 with magneto speedI don't think your load is out of line at all. When I did my load workup with RL-33 in my Model 70, I encountered ejector marks just below 79 grains. I consider 78.0 grains to be max, but didn't get anywhere near the velocity you did. Unfortunately, I didn't get any accuracy out of RL-33. Even if the accuracy were there, it didn't show enough advantage over Retumbo to be worthwhile. I strongly suspect it would work better with heavier bullets.
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