Sierra 107 TMK Load Data

[ckt3]

Makes sense. I have some XBR I’ll try first, but I also won’t be shooting past 400, so the velocities from Lever are tempting. Will prob give it a shot with a similar load to yours

 

[shayes11]

XBR was my second choice if I couldn't get the Lever to shoot well. Let me know how it turns out.

 

[30338]

Did some test seating in a 6x47 lapua. With the 107 TMK, I hit the lands at 2.75 oal which has about a bullet diameter worth bullet base in the neck. This with a .100 freebore. Should be about right. Hit the range next week.

 

[KY_coop]

Anyone loaded these with an extreme amount of jump? (.2xx ish) i had my 6 arc barrel throated pretty long to maximize the 108 eld's. When I measured with the hornady OAL tool the boat tail was all the way into the neck and wobbling. Ive loaded up some tests with a few different powders at 2.385 oal I will shoot tomorrow.

 

[Plague]

Anyone loaded these with an extreme amount of jump? (.2xx ish) i had my 6 arc barrel throated pretty long to maximize the 108 eld's. When I measured with the hornady OAL tool the boat tail was all the way into the neck and wobbling. Ive loaded up some tests with a few different powders at 2.385 oal I will shoot tomorrow.

I’m loading mine at 2.392 coal. No idea on how much jump I have going honestly. I was curious how picky they were going to be, so I found the lands and then just ran my seating die down till the boat tail was around the case shoulder. Accuracy has been good. Speed was faster than expected with my initial load of lever. What powders did you load?

 

[KY_coop]

Ive got h4895, xbr, varget, and staball match loaded up first. I also have some lever and rs tac I could try after.

 

[30338]

6-6.5x47,alpha brass, cci450, 16.5" barrel, 8 twist, 39.5 grains H4350, 2,800 fps, 5 shots in .4". 107 TMK and first load tested. Probably repeat a few times and just load those up. The 105 Berger VLD shot as well though at 2,750 fps. Barrel has about 20 rounds on it. Nightforce NX8 1-8 scope.

Forgot to add I am at the lands at 2.75 OAL, these were 2.74 OAL.

 

[kkp005]

Settled on a load for my 16” tikka
6cm 1/7 twist PBB

 

[PC356]

Loaded up 120 of these after I thought I’d found my load. Been thru a cpl boxes worth and can’t seem to group better than 1.5” for 5 now. Tried 6 or so different powders and lots of different seating depths. My Tikka 6 ARC PBB 18”, 7.5 twist barrel hates the 107 and 95 TMKs. Will use em to kill till they’re gone but will be sticking with 108 EHs when they’re used up. First try on load dev with 29.6 gr SB Match, 108 EHs shot a sub 7/8” 5 shot group. Only killed 1 critter (small hog) at 70ish yds and sure wasnt blown away with the 107 damage anyway. Small sample size but first try I sure didn't care for it. The 116 and 88 TMKs in a cpl Creeds load dev’d really quick and easy that said.

 

[KY_coop]

Today i shot 3 loads of h4895, varget, xbr, and LVR. 3 rounds each so not a huge sample size but they all grouped similarly 3/4- 1". 31.0 gr of LVR was the fastest I tested at 2730 fps. Varget was the slowest of the high charges 28.0 gr 2576fps. Xbr and 4895 both shot 2615ish fps @ 27.2 gr. I chose to load 50 rds with 30.2 gr lvr which has my gun sitting right around 2650 fps. Ill shoot these out to 500yds next time im at the range and see how they fly at range.
6 arc howa mini with 18" mcgowen

 

[John308]

I’ve had great results with 40.0 of H4350 in my Tikka 243. I settled on 2.885 OAL in M+ mags, which is around .040” off the lands and outs the boat tail at about the base of the neck. This load is with twice fired Peterson brass and Fed 210M primers, and velocity for 10 shots was about 2740 fps. I’ve probably got some room to go higher, especially based on what else I’m seeing here, but this load shoots great and I know I won’t have issues in the AZ heat.

-John

 

[Q_Sertorius]

I’ve had great results with 40.0 of H4350 in my Tikka 243. I settled on 2.885 OAL in M+ mags, which is around .040” off the lands and outs the boat tail at about the base of the neck. This load is with twice fired Peterson brass and Fed 210M primers, and velocity for 10 shots was about 2740 fps. I’ve probably got some room to go higher, especially based on what else I’m seeing here, but this load shoots great and I know I won’t have issues in the AZ heat.

-John

Nice shooting.

 

[Tanner]

This gun shoots everything I’ve tried really well, but these 107s fly exceptionally. This is 10 rounds, 5 at 610 and 5 and 805, with two high impacts corrected after truing the BC up right to .600 G1. Fired from the pack with a bino pack rear rest.

6 Creed going about 2860mv. By far the most shooter friendly and fun rifle I’ve had to date. And I’m sold on the 107s.

 

[OFFSHORE]

The 105 to 107 grain bullets is where I'm hoping my rifle will shoot best with a 2900'ish MV. Once I have it all put together I'll be in the "experimental stage" with these. I'm curious if anyone has put the 107 MK-X into deer/antelope sized critters yet and what their bullet performance was like. I do realize the MK-X didn't really hit the market until most seasons were over across the country, but there are hogs, aoudad and spring bear seasons that take place along with culling permits this time of year. . .though I would ask.

 

[NWBLKTAIL]

This gun shoots everything I’ve tried really well, but these 107s fly exceptionally. This is 10 rounds, 5 at 610 and 5 and 805, with two high impacts corrected after truing the BC up right to .600 G1. Fired from the pack with a bino pack rear rest.

6 Creed going about 2860mv. By far the most shooter friendly and fun rifle I’ve had to date. And I’m sold on the 107s.

View attachment 1063499View attachment 1063500

What barrel maker?

Edit: nvm found where you posted it

 

[tstowater]

Based on some posts on this thread, I loaded some 243's earlier this week and shot some today. Impressed. No chronograph along for speed. Will check next weekend.

Load: Once fired Starline 243 Winchester brass
CCI 200 primers (tan box, not sure how old)
40.5 grain of H4350
COAL: 2.941 (no clue what the jump is)

Not going to change anything. First 4 shots could easily cover with a quarter. Gun is Tikka T3X Lite Stainless, 20 inch barrel with US OS6-S suppressor. Will be using M+ mags, otherwise stock. No signs of pressure. 70 degrees. DA 2320.