Finally got out yesterday to do some testing with Richard Graves 169.5grn (they say 168grn on the side, maybe eary version) RBBT in my 270WSM. I got the bullets from Richard almost a year ago. I was shooting them in my factory Win70 that's been bedded, trigger tuned, and the barrel floated.
* All of the following are 3 shot groups using Retumbo *
* Loaded .030" off the lands *
charge vel group ES NOTES
64.0 2657 1.1 6 Two shots touching
64.5 2675 .863 8
65.0 2711 .670 1 Two shots touching
65.5 2742 1.445 16 Two shots close
66.0 2755 .723 ?
66.5 2768 .612 21 Two shots = one hole
I was suprised how well they shot. I was hoping for 2800 fps, but my ES's were very low. I know I don't have enough data yet, but it seems like my ES's were growing as my charges increased. I liked the last group, but my last three charges didn't increase velocity very much.
I have seven bullets left. What would you do next? Try for 2800 fps? Load up one of the accurate loads with different seating depths (like the 65.0 grn load)? Try H1000 for a few loads? I need to order some at some point, but I was just curious on opinions.
I've got a friend that is thinking of getting a 270 WSM. The one he is looking @ has a 1/11" twist. I want him to try some fo the 169.5s but I don't think he'll be able to stabilize them. I'll share your experiences w/him. I know he will appreciate it!!!
I think you've still got some room to go yet in that case. Comparing your 270 WSM to a 7mm WSM on Hodgdon's website, with a 168 grain bullet and Retumbo, 66 grains was their starting load at 2757 fps. I know that these aren't the same cartridge, but a very similar reference. They did get 2900 fps with Retumbo and a 70 grain compressed load. Pressure was still relatively low for a WSM at 58,500 psi.
Some people are like Slinkies...not really good for anything, but you can't help but smile when you see one tumbling down the stairs.
Hey 270WSM dude Where do you get such brutes? I must have some for my 270WSM. I've produced 3,000 out of mine with Nosler 160gr pills.H1000 has been a producer with my rifle(Win Mod 70 Classic). Cowboys! No baby Its Raiders Nation ..... [img]/ubbthreads/images/graemlins/mad.gif[/img]
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