Sierra Heavy TMK 6MM Testing

[Axlrod]

Nobody is using Staball65?

I have tried it in a few 22/6/6.5 Creed's and a 30/06. Usually the highest velo, but also the worst groups. Had one 6.5 Creed Savage that shot it prety well.

 

[B_Reynolds_AK]

I'm personally going to try Ramshot Grand once I get my Raven/Rokstok Lite 6 CM with the 116's. It worked great with my 22 CM and 88 ELD-M's as far as velocity and the best accuracy with those finicky bullets.

 

[sndmn11]

I have tried it in a few 22/6/6.5 Creed's and a 30/06. Usually the highest velo, but also the worst groups. Had one 6.5 Creed Savage that shot it prety well.

It's about all I use now and is right at home in a 6 creed.

 

[ID_Matt]

107 TMK. 26” 6 creed. 2.880” COAL

43.5 gr. N555 on the left

41.5gr. H4350 on the right.

View attachment 1029668
View attachment 1029669

N555
View attachment 1029670
H4350
View attachment 1029671


They definitely build less pressure with their short bearing surface than the 108 ELD and 109 LRHT. I’m guessing I could add a grain of powder over those 2 bullets.

How’s the case fill with N555? I have a pile of N560 I’m going to try when the 107’s arrive. Curious how it will do

 

[Bluumoon]

397103

RCBS seating die works fine fwiw

 

[huntnful]

How’s the case fill with N555? I have a pile of N560 I’m going to try when the 107’s arrive. Curious how it will do

It's pretty full man. I'm going to load up 44.5gr. N555 in the once fired brass and test the 107's again, but that'll be a damn full case.

Here’s 44.5gr. N555 in virgin alpha LRP brass.

It’s right to the bottom of the case neck itself

 

[SloppyJ]

It's pretty full man. I'm going to load up 44.5gr. N555 in the once fired brass and test the 107's again, but that'll be a damn full case.

Here’s 44.5gr. N555 in virgin alpha LRP brass.

It’s right to the bottom of the case neck itself
View attachment 1029895

Vibrate that stuff right down.... then add another grain!

 

[Bluumoon]

41.5gr showed slightly difficult bolt lift in the Tikka/PBB.

Went 40.5 gr in each rifle, then 41.5 gr (4 rounds)
Then loaded 20.

No other workup.

Felt like I pulled one on the MRC.

 

[huntnful]

41.5gr showed slightly difficult bolt lift in the Tikka/PBB.

Went 40.5 gr in each rifle, then 41.5 gr (4 rounds)
Then loaded 20.

No other workup.

Felt like I pulled one on the MRC.

Beautiful! Nice to see the MRC hammering also!

Vibrate that stuff right down.... then add another grain!

Hahaha that actually works like shit. Blows kernel’s and shit all over the place lol. Just a finger over the case mouth and tape it on the table.

 

[wind gypsy]

I’ve found 43-43.5 gr n555 to be about perfect case fill.

 

[huntnful]

I'm gonna try them at 2.9" off the bat. I didn't hit the lands till 2.98" ish (.210 FB).

Damn! Long AF!

 

[eoperator]

Hoping sammi 6cm, alpha brass, n555 and 116's get along together.

I am assuming 2.85" mag length will eat up some powder space with that combo.

 

[jjohnsonElknewbie]

They must be pretty soft bullets, I noticed a little ring on mine with fairly light neck tension. Long nose on these guys.

Going to load up 50 at the same charge and give them a go. Need to get a cover for my suppressor before doing any more group work.

LS Wild is awesome

 

[huntnful]

Hoping sammi 6cm, alpha brass, n555 and 116's get along together.

I am assuming 2.85" mag length will eat up some powder space with that combo.

Based off these 107's not really being ideal in the SAAMI and still shooting very well, I'm expecting the 116's to be excellent.

I will probably still run the 107's because the BC and speed will beat the 116's and I'm not really planning to kill much with them.

 

[Porthunter]

Based off these 107's not really being ideal in the SAAMI and still shooting very well, I'm expecting the 116's to be excellent.

I will probably still run the 107's because the BC and speed will beat the 116's and I'm not really planning to kill much with them.

I may be missing this in the thread, but why isn’t SAAMI ideal for the 107s?

I have 400 on order and a rifle being chambered in 6cm right now, should I be asking my smith to change up or throat it deeper in your opinion?

 

[huntnful]

I may be missing this in the thread, but why isn’t SAAMI ideal for the 107s?

I have 400 on order and a rifle being chambered in 6cm right now, should I be asking my smith to change up or throat it deeper in your opinion?

IMO the SAAMI throat is deeper than ideal for the 107’s. Not that they won’t shoot. Hell they shoot great in mine. Just that I prefer to be right near the lands with the bearing surface like 3/4 of the way into the neck. With this bullet and SAAMI chamber, when right near the lands, the bullet is barely inside the case neck.

Obviously you can just jump them a decent ways and everything should probably be fine. Just not my preferred starting point to have a long jump right out the gate.

 

[NW_backcountry90]

107’s show up today. Going to test them in the 6 creed and 6 prc and see what they can do. When the 116’s show up I will do the same.