Sierra 107 TMK Load Data

[Brado16]

Do the 107s like or need a decent jump? Just got my hands on some, and a loaded Dummy round loaded to the lands is 2.9150” in my rifle, but my MDT mags are limited to 2.85”. If I load them to 2.80”, that’s 0.115” jump. Any input?

 

[Q_Sertorius]

Do the 107s like or need a decent jump? Just got my hands on some, and a loaded Dummy round loaded to the lands is 2.9150” in my rifle, but my MDT mags are limited to 2.85”. If I load them to 2.80”, that’s 0.115” jump. Any input?

My Tikka did not like them at 2.8”.

 

[ztc92]

Do the 107s like or need a decent jump? Just got my hands on some, and a loaded Dummy round loaded to the lands is 2.9150” in my rifle, but my MDT mags are limited to 2.85”. If I load them to 2.80”, that’s 0.115” jump. Any input?

My post a recently with a 1.1” group was shot from a 243 with a COAL of about 2.820 and an estimated jump of about 0.025”. Best group I’ve shot from this gun so far and I have no plans to mess with it.

 

[Ryan Avery]

6CM
18" 7.5 Twist
Alpha Brass LP
RL 16 41g 90 thou jump @ 2850
5 shot at 700 yards
Group size is good enough for hunting.

 

[ChrisAU]

Seeing these 6CM speeds has me wondering if I’m loading my Dasher too hot? I was gonna back off 0.2gr of Varget anyway but I was at 2816 with just 80 rounds on my 18” Dasher. It is the first load dev I’m done with Alpha brass so maybe I’m not looking hard enough for signs?

 

[Matt5266]

6CM
18" 7.5 Twist
Alpha Brass LP
RL 16 41g 90 thou jump @ 2850
5 shot at 700 yards
Group size is good enough for hunting.

Ryan what about was the group size out of curiosity?

 

[Sako300]

758 yards. Back to back shots I only had 2 rounds left of the H4350 40.5 gr , 2.932 COL, 107s. Just aiming dead center. Just under 4 inches apart.
Tikka factory .243 20’’
2835 fps