Sierra 107 TMK Load Data

[Matt5266]

Went out again today. Wind was 25mph or so in my face. Loaded more to try again when no so windy. 2836 FPS Tikka 243 18" supressed

 

[Jimbee]

Tikka 20" 6GT 7twist Preferred prefit.
107tmk hornady brass, 32gr Varget, cci450.
2675fps, ES 37, SD (100 yds, not 662) 9

 

[Sako300]

Went out again today. Wind was 25mph or so in my face. Loaded more to try again when no so windy. 2836 FPS Tikka 243 18" supressed

Try 40.5 grains!

 

[Matt5266]

Try 40.5 grains!

I've shot 41 and 41.5

Did you try these loads and find better results with 40.5?

My 41 load was worse that the 41.5

 

[Sako300]

I've shot 41 and 41.5

Did you try these loads and find better results with 40.5?

My 41 load was worse that the 41.5

I did! Around 1 MOA with the 40.5 H4350
20 thousands off lands
Tikka 243 20’’
Around 2835 fps

 

[Pistolpete28]

I did! Around 1 MOA with the 40.5 H4350
20 thousands off lands
Tikka 243 20’’
Around 2835 fps

Similar to mine
Tikka 243 20”
210m
Starline 1x
40.5 h4350
2879 fps average
1 moa

 

[Bluumoon]

Tikka 20" 6GT 7twist Preferred prefit.
107tmk hornady brass, 32gr Varget, cci450.
2675fps, ES 37, SD (100 yds, not 662) 9View attachment 1054769View attachment 1054770

Just how tall a fella are ya? Impressive spacer game, walnut none the less.

 

[Matt5266]

@Pistolpete28 @Sako300 what COAL did you end up with?

 

[SloppyJ]

Let's do an 88gr thread too. Just took measurements last night on two fresh barrels.

 

[Sako300]

@Pistolpete28 @Sako300 what COAL did you end up with?

2.934’’

 

[Pistolpete28]

@Pistolpete28 @Sako300 what COAL did you end up with?

 

[Nine Banger]

Let's do an 88gr thread too. Just took measurements last night on two fresh barrels.

Thread '88 TMK Loading Thread '

Mar 11, 2026

Thought it would be nice to have some data in one spot.

If adding data include cartridge, brass, primer, powder, bullet jump and other pertinent info.

I’m thinking of your adding more data as we go maybe edit your original post to include it to try to keep thread from getting too cluttered and needing to search while thing for info.


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• Jake Leibke
• Replies: 361
• Forum: Reloading

• 

 

[huntsd]

Went out again today. Wind was 25mph or so in my face. Loaded more to try again when no so windy. 2836 FPS Tikka 243 18" supressed

How’s your brass look at 41.5? Seems likes that’s getting near “spicy” levels

 

[Matt5266]

Perfect. It was virgin brass. No marks or swipes. Primers are not flat either. No stiff bolt lift. I could probably step on it a little bit more. I don't think that will help my groups though

 

[mtnbound]

Tried Grand today with the 107s no LD just went under max (no PSI) to see what it might do and it was slower than I expected. Then did a follow up with H4831SC and Hunter because of some chrono issues with previous tests.
107TMK, Hornady brass,Fed215 primers, 2.80 coal, 6CM, 16.5” PBB 7.5twist.