Sierra 107 TMK Load Data

[Q_Sertorius]

2.91

I kept everything the same only dropped charge weight.

41.5 to 40.5 lost me about 60ish fps

But at my elevation yesterday still makes it to 750 yards before dipping below 1800 fps

Thanks.

Looks like we are running the same basic load. The bullet will carry enough velocity to kill much further than I normally shoot at game.

 

[Rockpicker]

I have a 243 Tikka and it’s not a tack driver out of the box but is starting to come around. Started with 70gr NBTs to do scope sight in then switched to 107s. With 107s I used 41.0gr of H4350 at 2.830” and it’s okay. Went to 2.900” and it tightened up a bit and vertical was consistent. Was getting ejector marks on new Starline brass so will drop to 40.5gr and see what happens. Hopefully Wednesday the wind will be consistent and under 10mph.

 

[Matt5266]

Thanks.

Looks like we are running the same basic load. The bullet will carry enough velocity to kill much further than I normally shoot at game.

Yup, your data was one of the handful I referenced as a starting point.

Same. Im not a "long range hunter" but I enjoy knowing it can reach out there.

 

[Matt5266]

I have a 243 Tikka and it’s not a tack driver out of the box but is starting to come around. Started with 70gr NBTs to do scope sight in then switched to 107s. With 107s I used 41.0gr of H4350 at 2.830” and it’s okay. Went to 2.900” and it tightened up a bit and vertical was consistent. Was getting ejector marks on new Starline brass so will drop to 40.5gr and see what happens. Hopefully Wednesday the wind will be consistent and under 10mph.

That puts you right where I ended up. (2.91 and 40.5 gr new starline brass)

Thats the sweet spot for my gun.

 

[Plague]

I wouldn’t shoot that without some safety glasses.

Bolt lift was a bit heavy with ambient in the high 60’s. Minor primer flattening and slight bit of extrusion around the firing pin. No swipe. I have another batch loaded at 31gr even. Just for a little more wiggle room when dealing with rain and such. You need to live a little more. This is the same load I was running for the 108 eldm. That’s only .3gr above Hornady’s published data. I generally shoot with safety glasses.
You would hate my 87gr vmax load.

 

[Tanner]

40gr in my 19” PBB made 2870 and 40.5 in an 18” MRC is making right at 2900.

This load seems to be ready to mass produce. 5 107s at 2870 off of a fairly unstable front rest in some heavy winds. Easy to please.

 

[Pistolpete28]

Tikka 243
20” barrel
6x SWFA
1x starline brass
Gm210m primer
40.5 grains H4350
2.915” COAL
2880 FPS average
Ill probably roll with this, it should be good enough for an 11 year old at 300 or less on deer.

 

[YaakRiver]

Pretty wild for ~30gr of powder. I need a 6 ARC…

It will be my go-to cartridge for every big game hunt now - recoil is extremely low, accuracy is outstanding and velocity is good to 2004 fps at 600 yards and 1802 fps at 790 yards. What's not to love?

 

[Lawnboi]

Bolt lift was a bit heavy with ambient in the high 60’s. Minor primer flattening and slight bit of extrusion around the firing pin. No swipe. I have another batch loaded at 31gr even. Just for a little more wiggle room when dealing with rain and such. You need to live a little more. This is the same load I was running for the 108 eldm. That’s only .3gr above Hornady’s published data. I generally shoot with safety glasses.
You would hate my 87gr vmax load.

Ha yea, brass can hide a lot sometimes. Creed speed in an arc is screaming danger. I’d just be careful as you get more rounds on the barrel

 

[Plague]

Ha yea, brass can hide a lot sometimes. Creed speed in an arc is screaming danger. I’d just be careful as you get more rounds on the barrel

I appreciate the concern. And always check my
Brass for pressure signs. I will likely back down .5gr to leave some more wiggle room. I was expecting 60-80 fps slower when I shot this load over a chronograph the first time.

 

[43.6N]

6GT
18” Barrel
Both 107 and 116tmk
Varget and H4350
5 shot test groups.

1.
107tmk
34.0gr Varget
2770fps

2.
116tmk
33.0gr Varget
2676fps
**hit suppressor cover on marked shot**

3.
107tmk
37.0gr H4350
2691fps

4.
116tmk
36.0gr H4350
2600fps


I do not appreciate any pressure signs on the brass.

Takeaway:
Varget loads look G2G as they are.
H4350 will go up a grain and retest.