Help with 143gr Hammer Hunters in 7 rem mag

3350 in a 27" 7mmWSM is where I backed off due to flattened primers I recall, down to 3300
R22
Can't recall charge weight... I can pull my notes if it would be helpful at all. I seem to remember 66 or so?
Mostly just posted to indicate that yeah, that is slow.
 
ok finally got around to another pressure test, this time with RL26.

New Peterson Brass
215m primer
143 hammer hunters
RL26 powder
.020 off the lands

Below are the results, reminder that I have a 22" barrel...

67.0gr - 3,102 fps
67.5gr - 3,080 fps
68.0gr - 3,075 fps
68.5gr - 3,105 fps
69.0gr - 3,179 fps
69.5gr - 3,164 fps
70.0gr - 3,198 fps
70.5gr - 3,231 fps

***Didn't have any signs of pressure, sticky bolt, plunger mark or primer issues

For now I'm looking at that 69.0-69.5gr window to revisit for group testing.

I always start at .020 off the lands, but does anyone else have suggestions for this bullet specifically? They did shoot very well with the magneto speed attached, so if that's any indication - they should shoot very well.

Thanks for any input!
 
ok finally got around to another pressure test, this time with RL26.

New Peterson Brass
215m primer
143 hammer hunters
RL26 powder
.020 off the lands

Below are the results, reminder that I have a 22" barrel...

67.0gr - 3,102 fps
67.5gr - 3,080 fps
68.0gr - 3,075 fps
68.5gr - 3,105 fps
69.0gr - 3,179 fps
69.5gr - 3,164 fps
70.0gr - 3,198 fps
70.5gr - 3,231 fps

***Didn't have any signs of pressure, sticky bolt, plunger mark or primer issues

For now I'm looking at that 69.0-69.5gr window to revisit for group testing.

I always start at .020 off the lands, but does anyone else have suggestions for this bullet specifically? They did shoot very well with the magneto speed attached, so if that's any indication - they should shoot very well.

Thanks for any input!
I'm shooting 143s in my 280 AI not exactly the same but pretty close. I had good results with RL 23 and 26 with a .025 to .03 jump.
 
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