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 'Sierra 88 TMK Load Data'

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: 373
• 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.

 

[PC356]

Alright, finally sumthin promising out of the 107s in my 18” Tikka, 7.5 twist, 6 ARC. Bout the 5th powder I’ve tried. 3 times fired Hornady brass, BR4 primer, 2.400” COAL, 1.475” trim length, 3-4 thou shoulder bump, 29.7 grains Staball Match powder. Very slight primer cratering only pressure sign. Probably back powder off 2/10ths and run em if groups hold up. If I leave it alone can run a + 1/10th correction factor for QD out to 600 where it’s still hitting 1890 fps at my DA. Very low ES/SD is icing.

 

[Nine Banger]

6mm CM
45gr H4381SC
2.680"
16" 1:7.5" bbl
107gr tmk
2775fps

Gun is zeroed for 115 Nosler RDF.

The Frankford Arsenal universal seating die that Formidilosus recommended does not mark the bullets (or the 88s or 116s).








9 shot group, 2 sessions. Planned for 10 shot group but stuff happens.

 

[Nine Banger]

For those seeking Quick Drop at Sea Level:

6mm CM
44.5gr H4381SC
2.680"
16" 1:7.5" bbl
107gr tmk
2750fps

 

[Matt5266]

6mm CM
45gr H4381SC
2.680"
16" 1:7.5" bbl
107gr tmk
2775fps

Gun is zeroed for 115 Nosler RDF.

The Frankford Arsenal universal seating die that Formidilosus recommended does not mark the bullets (or the 88s or 116s).






View attachment 1055733

9 shot group, 2 sessions. Planned for 10 shot group but stuff happens.

View attachment 1055734

The 9 shots and the squirrel literally made me spit coffee laughing! Thanks !

 

[Nine Banger]

The 9 shots and the squirrel literally made me spit coffee laughing! Thanks !

That makes me smile, thanks for letting me know.