Sierra Heavy TMK 6MM Testing

[coya]

Is your 107 load with imr4350 also? Do you mind sharing what it was?

107 tmk/108 eldm
Imr4350 41.9gr
2.800
107 tmk 2982fps
108 eldm 2983fps

Both shoot a 1.5 inch group

 

[brucemt]

107 tmk/108 eldm
Imr4350 41.9gr
2.800
107 tmk 2982fps
108 eldm 2983fps

Both shoot a 1.5 inch group

Thanks coya, appreciate it

 

[coya]

Tried the 116's a touch hotter at 41.0 grains of imr4350 and the gun didn’t like it. Gonna keep the 40.6 load and just let her be a "good gun"

 

[Hurley88]

Ok, rooouuugh mock-up (time constraints & not using this gun with the 116 TMK), but here goes.

I didn’t disassemble the bolt for a real Wheeler test, didn’t use bullet seater with microneter adjustment, just did it by feel and measured as I went. So don’t trust my numbers, I just didn’t want the bullet rammed into the lands.

Looks like when seated to mag length in M+ mags, the neck grabs the whole bearing surface of the bullet and the jump distance is somewhere around 0.088–0.116” (like I said, rough).

I’ll be out in the morning hopefully to shoot some and post velocities. Will do as I usually do, just a half grain difference per round and record the velocity. First sign of any pressure, I subtract a grain and call that max. I’ll post up here if I can get ‘em done.

 

[coya]

Tried the 116's a touch hotter at 41.0 grains of imr4350 and the gun didn’t like it. Gonna keep the 40.6 load and just let her be a "good gun"

Forgot to mention, this load shot 2910fps