Sierra Heavy TMK 6MM Testing

[Matt5266]

Kinda disappointing all the folks posting their results with the 107s, pretty much looking like their 1.5 inch group bullets. Not that it is bad groups, I guess im just spoiled by how my 77 tmks shoot...

 

[MCGHeel]

Anybody try the federal gmm 6arc with 108 berger bt targets? I've seen other bergers mentioned as GTG for terminal performance but not these in particular. Curious if they're worth a try. @Formidilosus or others with experience? thanks

 

[RancherJohn]

I bribed @Tanner with some TMKs and he was kind enough to load some up 6cm for both of us.

He can add in his rifle info, I just know it was a re-barrelled Tikka.

His 107 loading was some tired Starline brass (I believe), 40.5 gr H4350, 10.5 fps SD, 2875 fps avg.

For the 116s, same brass, 39.5 gr H4350, 21 fps SD, 2811 fps avg.

For my MRC, 107s in once-fired Lapua over 40.5 gr H4350, 9.6 fps SD, 2870 fps avg.

For the 116s, same brass, 39.5 gr H4350, 9.6 fps SD, 2800 fps avg - these 5 shots had stiff bolt lift but no other pressure signs. I had 4 more and shot them 10 minutes later with no stiff bolt lift (2805 fps avg, 6.2 fps SD), not sure what was going on there.

Both loads out of both guns were about 1MOA with a stiff breeze and some mirage. Time to load 50 and go kill some bears. I don't know if we will chase a different load for more accuracy; I want to shoot 10 on a calm day, I think .7ish MOA is very realistic.

 

[jonnyviceroy]

Kinda disappointing all the folks posting their results with the 107s, pretty much looking like their 1.5 inch group bullets. Not that it is bad groups, I guess im just spoiled by how my 77 tmks shoot...

Posted this awhile ago in another thread I believe. But that hasn’t been my experience with them at all. (Yes this is absolutely cherry picking one of the better groups and 7 not 10 shots) but they have all been around .75-.8 for a majority of 10 shot groups I’ve tested. 2.800 coal, short-ish but ime these TMKs do well with a good bit of jump.

 

[Nine Banger]

7.5 Twist 6 ARC PBB barrel, Tikka action. Tried 4 different powders with the 107s, never got better than 1.5-1.8” groups. Gonna experiment with Staball Match some with em. If it’s a no go, givin up on em in that rifle. Hopin to have better luck with 116s in my 6 Creed and the PRC I’m building.

If the new guns are going to be 12-19 lbs you might be good.

It's hard to watch all the chatter about disappointment etc. over 1.5" groups with dudes shooting 8-10lbs field rifles.

 

[Plague]

7.5 Twist 6 ARC PBB barrel, Tikka action. Tried 4 different powders with the 107s, never got better than 1.5-1.8” groups. Gonna experiment with Staball Match some with em. If it’s a no go, givin up on em in that rifle. Hopin to have better luck with 116s in my 6 Creed and the PRC I’m building.

SAMMI spec chamber? What length were you loading them to? What powders and charge weights have you tried?

 

[ChrisAU]

Kinda disappointing all the folks posting their results with the 107s, pretty much looking like their 1.5 inch group bullets. Not that it is bad groups, I guess im just spoiled by how my 77 tmks shoot...

hmmm let me get some pics of my Dasher groups with 107's, at 18" and 2820+, not far off of some CMs in this thread. I dunno why people feel the need for big boomers such as 6CM

 

[Q_Sertorius]

It's hard to watch all the chatter about disappointment etc. over 1.5" groups with dudes shooting 8-10lbs field rifles.

I am afraid I don’t follow you on this one. Are you saying it is unrealistic to expect an 8-10 pound hunting rifle to shoot a 1.5” (or better) 10-shot group?

 

[Tanner]

hmmm let me get some pics of my Dasher groups with 107's, at 18" and 2820+, not far off of some CMs in this thread. I dunno why people feel the need for big boomers such as 6CM

For big bears, you gotta’ “use enough gun”….

 

[jonnyviceroy]

hmmm let me get some pics of my Dasher groups with 107's, at 18" and 2820+, not far off of some CMs in this thread. I dunno why people feel the need for big boomers such as 6CM

I know this is 6mm thread but the amount of times per day I think about how fun a 22 Dasher would be… It’s bound to happen sooner than later. Dashers are just the most fun easy button.

 

[Nine Banger]

I am afraid I don’t follow you on this one. Are you saying it is unrealistic to expect an 8-10 pound hunting rifle to shoot a 1.5” (or better) 10-shot group?

Consistently, all the time; yes...emphasis on "or better".

On that vein, thinking you're better than the gun runs parallel to the small shot string group fallacy.

 

[YaakRiver]

It is relevant, guns that do that keep doing that.
Work on your trigger control, that is where horizontal at 100 comes from.

Unless you are sending them real fast, I would definitely go 7 in an arc.

Thanks - it has continued to do that. I shot a PRS match this past weekend and realized that my process needs to be more methodical - shoulder, cheek weld, hand position, trigger finger position . . . I will work on it.

 

[dreamingWest]

I bribed @Tanner with some TMKs and he was kind enough to load some up 6cm for both of us.

He can add in his rifle info, I just know it was a re-barrelled Tikka.

His 107 loading was some tired Starline brass (I believe), 40.5 gr H4350, 10.5 fps SD, 2875 fps avg.

For the 116s, same brass, 39.5 gr H4350, 21 fps SD, 2811 fps avg.

For my MRC, 107s in once-fired Lapua over 40.5 gr H4350, 9.6 fps SD, 2870 fps avg.

For the 116s, same brass, 39.5 gr H4350, 9.6 fps SD, 2800 fps avg - these 5 shots had stiff bolt lift but no other pressure signs. I had 4 more and shot them 10 minutes later with no stiff bolt lift (2805 fps avg, 6.2 fps SD), not sure what was going on there.

Both loads out of both guns were about 1MOA with a stiff breeze and some mirage. Time to load 50 and go kill some bears. I don't know if we will chase a different load for more accuracy; I want to shoot 10 on a calm day, I think .7ish MOA is very realistic.

Apologies if I'm just blind. I like those speeds, what barrel lengths? TIA.

 

[RancherJohn]

Apologies if I'm just blind. I like those speeds, what barrel lengths? TIA.

Mine is an 18", not sure about Tanner's. Both rifles are suppressed too.

 

[PC356]

If the new guns are going to be 12-19 lbs you might be good.

It's hard to watch all the chatter about disappointment etc. over 1.5" groups with dudes shooting 8-10lbs field rifles.

I’ve got a 6 Creed, 22 Creed, .308, all set up very similarly, all in RokStoks. All 10 plus lbs.
All shoot sub MOA for 5. I’m not saying 1.5” is awful or limiting by any stretch, if it stayed around that I’d be fine but plenty of groups are closer to 2” than 1.5”. Just grown used to what the other rifles do and feel it oughta match it. Currently running 105 VLD Hs in that same Tikka 6 ARC over H4895. It seems to hang around the 7/8” for 5 mark fairly consistently. I’m not cherry picking and realize 1.5” groups are plenty serviceable. SAAMI spec ARC chamber with the 107’s I’ve tried H4895, Lever, 8208,
Benchmark. All middle of factory Sierra/Hornday data charges for similar bullet weights and All 1.5” to 2” groups. Loading around 2.400” in PODS 3D printed mags. Honestly just kept markering a bullet and kept setting it back off lands. Where I ended up. Gonna try some Staball Match when it arrives. Really feel like 95 TMKS are a better match for an 18” 6 ARC anyway. I have a good Benchmark load for those.

 

[Ryan Avery]

This thread is awesome, but it's getting bulky. Can you guys start posting data in these two threads? Thanks!

Thread 'Sierra 107 TMK Load Data'

Today at 9:20 AM

Save

• Ryan Avery
• Replies: 7
• Forum: Reloading

• 

Thread 'Sierra 116 TMK Load Data'

Today at 9:21 AM

save

• Ryan Avery
• Replies: 4
• Forum: Reloading

• 

 

[RyanT26]

Kind of lost track of this thread, but is the general consensus that the 107 are finicky on getting to shoot well?

 

[mtnbound]

Looks beautiful. H4350 is tough to beat!!

H4350 is good, I was and H4831SC are the powders that my rifle likes with the 116TMK.

This thread is awesome, but it's getting bulky. Can you guys start posting data in these two threads? Thanks!

Thread 'Sierra 107 TMK Load Data'

Today at 9:20 AM

Save

• Ryan Avery
• Replies: 7
• Forum: Reloading

• 

Thread 'Sierra 116 TMK Load Data'

Today at 9:21 AM

save

• Ryan Avery
• Replies: 4
• Forum: Reloading

• 

Is there a way to move Posts from this thread to the new ones, or do we just repost them?

 

[ckt3]

hmmm let me get some pics of my Dasher groups with 107's, at 18" and 2820+, not far off of some CMs in this thread. I dunno why people feel the need for big boomers such as 6CM

These guys and their walloping 6 Creeds

 

[Ryan Avery]

H4350 is good, I was and H4831SC are the powders that my rifle likes with the 116TMK.

Is there a way to move Posts from this thread to the new ones, or do we just repost them?

Repost please, or just post any new info there. I could move the posts, but it would jack up the flow of this thread.