Help with 143gr Hammer Hunters in 7 rem mag

[cohunt]

I'm using rl23 and getting just shy of 3300 from a 26" bbl

 

[Bob Wright]

I'm getting 3310 with Retumbo, 7RM and 143HH. It could go faster still as I never hit top end pressure. Just hit a decent ES.

 

[257Tony]

What's your load with H1000 if you don't mind me asking?

83.0 loaded at 3.520" which is a .030 jump. 3500 fps over the magnetospeed, 3475 corrected based on 1000 yd drops.

 

[2buffalo]

83.0 loaded at 3.520" which is a .030 jump. 3500 fps over the magnetospeed, 3475 corrected based on 1000 yd drops.

Thank you.

 

[mandl]

I'm using 68.7gr of RL23 and I am getting 3260fps. Try using RL26.

I'm the same as Capt.Dru. Re23 69.0 grains. 3250fps. Factory Browning Xbolt.

 

[SouthLoganCountyShooter]

Not hammer but 139lrx h4350 getting just shy 3200

 

[Jonoton]

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.

 

[cb4128]

dang wish I could find some RL23! Wonder where I could snag some of that

 

[cb4128]

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!

 

[Chico guy]

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.

 

[cb4128]

ok awesome, thanks!

 

[GLTaylor]

Try more jump and slowly increase powder til you find pressure, then back off 1 grain and shoot for groups.
Don't hesitate to jump .050 or more if you have room for powder.
Also need your twist rate

 

[cb4128]

twist is 1-8.4, proof barrel

 

[GLTaylor]

Thanks. Also, are you crimping?