Sierra Heavy TMK 6MM Testing

[philcox]

Does it come up to the base of the shoulder? IIRC (probably don’t), that’s where it usually is for me

Yep, looks about there.

 

[schmidty3]

You guys suck (yet again). 6mm dies, 18" 1-7" Pbb .750 fluted barrel, and 116s when they drop are (or will be) ordered.

 

[Hurley88]

Yep, looks about there.

Yeah, then it’s not low enough case fill to be concerned about IMO. I’ve never had issue with angled shooting or erratic velocities or anything. But then again I don’t seat the bullet up the case neck, I want the whole neck grabbing the bullet.

I say rock on, I’ve gone through at least three jugs of H4350 in 243/6CM in the 41-41.5 range.

 

[nphunter]

Pretty pleased with the 107’s. Went and checked my ballistics and my drop chart is right on using sierras BC with my actual velocity.

Shot a 3”ish seven shot group at 500 and then backed up to 730 and shot three shots right at 2” holding 3/4 mil for wind, last two were 3/4” apart.

Final load:
41.5gr H4350
Peterson Brass
CCI BR2
Coal 2.918”
.022 off lands
2760fps

1:8, Tikka 16” barrel

 

[ID_Matt]

Pretty pleased with the 107’s. Went and checked my ballistics and my drop chart is right on using sierras BC with my actual velocity.

Shot a 3”ish seven shot group at 500 and then backed up to 730 and shot three shots right at 2” holding 3/4 mil for wind, last two were 3/4” apart.

Final load:
41.5gr H4350
Peterson Brass
CCI BR2
Coal 2.918”
.022 off lands
2760fps

1:8, Tikka 16” barrel

View attachment 1036600

View attachment 1036661

At 2.918” those gotta be barely in the case don’t they? I have some loaded for tomorrow. 2.785” was right about where the boat tail hits the neck/shoulder junction.

 

[nphunter]

At 2.918” those gotta be barely in the case don’t they? I have some loaded for tomorrow. 2.785” was right about where the boat tail hits the neck/shoulder junction.

I’m using M+ (6.5cm mags) they wouldn’t fit in the factory .243 M mag, the 108ELDM was right at mag length and it’s a shorter bullet.