Sierra Heavy TMK 6MM Testing

[philcox]

16" or 18" barrel?

18” 6CM. First shots down a new tube.


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[Chris in TN]

18” 6CM. First shots down a new tube.


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Thank you. That's encouraging. I want to hit 2800' with an 18". Sounds like it'll be easy-peasy to do so and still be below maximum.

 

[jonnyviceroy]

Thank you. That's encouraging. I want to hit 2800' with an 18". Sounds like it'll be easy-peasy to do so and still be below maximum.

You will be able to forsure. I have a 16.5” 6cm and well below pressure I’m at 2850. Worked up to pressure at about 2940, you’ll make it easy!

 

[IrkedCitizen]

Blue collar has 88s

Sierra 22cal 88gr Tipped MatchKing

Product Information Caliber: 22 cal Bullet Diameter: 0.224" Bullet Weight: 88 Grains OAL: Bullet Style: Tipped MatchKing G1 BC: 0.525 G7 BC: 0263 Part Number: 7188 or 7188C Quantity: 100 or 500

www.bluecollarreloading.com

 

[Porthunter]

Loaded up a ladder of N555 with the 116’s. 41 grains - 43.5 grains. 20 thou off the lands. 43.5 grains shot 2800 out of 18” barrel. It’s a new barrel with only a few shots in it. No pressure signs at 43.5. Gonna load up 20
at 42 grains and shoot them at 100 and at distance to see how they shoot. Looks like they are gonna shoot awesome!

Alpha brass SRP
Cc 450 primers
2.89 col

Tikka action chambered in 6 creedmoor with Bartlien 18” barrel 1:7.5” twist.

This is exciting. Have a Tikka being re chambered to a 6creed with the exact same plan for load.

Did you measure what that is for jump in your chamber? Assuming SAAMI chamber?

 

[justin davis]

This is exciting. Have a Tikka being re chambered to a 6creed with the exact same plan for load.

Did you measure what that is for jump in your chamber? Assuming SAAMI chamber?

Yea they were 20 thou off the lands Fits in mag.

 

[philcox]

Thank you. That's encouraging. I want to hit 2800' with an 18". Sounds like it'll be easy-peasy to do so and still be below maximum.

Yep. 42.5 should easily be 2800+, even 42 with a bit more down the tube. FYI, 7800 DA.

 

[huntnful]

The tips on the TMK’s are less than impressive IMO. These are the 116’s. Tip on the left is raised slightly, canted to the right and where the jacket meets the tip is also crooked.




They still shoot decent, but nothing spectacular. But you can’t expect anything extraordinary with tips wobbling at 260,000 RPM’s. 42.5gr. N555 gave 3010fps from a 26” 6 creed at 2.920” COAL.

 

[eoperator]

The tips on the TMK’s are less than impressive IMO. These are the 116’s. Tip on the left is raised slightly, canted to the right and where the jacket meets the tip is also crooked

I agree the new tmk's don't have typical sierra quality.

 

[JDMBEND]

The tips on the TMK’s are less than impressive IMO. These are the 116’s. Tip on the left is raised slightly, canted to the right and where the jacket meets the tip is also crooked.

View attachment 1043720


They still shoot decent, but nothing spectacular. But you can’t expect anything extraordinary with tips wobbling at 260,000 RPM’s. 42.5gr. N555 gave 3010fps from a 26” 6 creed at 2.920” COAL.

There is a rabbit hole to dive into. Most likely has an effect, but how much? Thanks for the heads up, will keep an eye out for this.

 

[huntnful]

There is a rabbit hole to dive into. Most likely has an effect, but how much? Thanks for the heads up, will keep an eye out for this.

Agreed for sure. Cause a miss on an animal at moderate distances? Unlikely.

I had one bullet land 1.5” outside the group. That’s not normal for this gun. I didn’t look at that specific tip, so I’ll never know. But it would be a slow road to build long range confidence with this type of quality. At least for me personally. If I can see imperfections in concentricity with my naked eye, that just doesn’t sit well with me when trying to get good data at long range.

 

[huntnful]

I agree the new tmk's don't have typical sierra quality.

That’s all I have experience with from sierra currently, but I’m not over the moon. I’ll probably spend more time with these 116’s but the bullet quality is absolutely nothing special. They shot well enough for shooting random shit though. Maybe have my daughter use them on a deer.

 

[SouthPaw]

My box of 116s came in today. I pulled out 2 of them to make measurements, and one of them looked just like the "off" bullet in @huntnful photo. I'll go through the box at some point and pull out some off-looking ones and shoot them for a group against a group of "good" looking ones, but definitely going to be selective when loading anything meaningful.

I've shot piles of the 77s and 130s and their consistency has been great. Better than ELDM for me.

 

[Lawnboi]

The tips on the TMK’s are less than impressive IMO. These are the 116’s. Tip on the left is raised slightly, canted to the right and where the jacket meets the tip is also crooked.

View attachment 1043720


They still shoot decent, but nothing spectacular. But you can’t expect anything extraordinary with tips wobbling at 260,000 RPM’s. 42.5gr. N555 gave 3010fps from a 26” 6 creed at 2.920” COAL.

Iv seen similar with different lots of ELDs. Had one lot so bad I sent it to Hornady. They told me the tip has minimal impact on the precision but did replace that lot of bullets for me.

 

[Nine Banger]

I had one bullet land 1.5” outside the group.

I had one of those yesterday with an 88. No wobble zone. One of a couple hundred shot tho.

 

[justin davis]

Yea quite a few of my 116’s have bent tips. Guess we will see if they shoot at long range?

 

[Matt5266]

Anyone seen the same issues with the 107s?

 

[coya]

I shot the 116s at 1000 yards last weekend and they did fine

 

[Rockpicker]

Pull a few tips and see if the HP is off center. I’m bored this weekend so am curious.

 

[Formidilosus]

@Formidilosus
which would be better terminally... a 107/116tmk at 1800fps impact velocity compared to a 108/109eldm at a higher 2000fps impact velocity? Assuming same shot placement (elk, mule deer, moose, bears, etc).

TMK across the board.

"better" could be...
which one incapacitates quicker

Given lot to lot variation, TMK by probability.

which one gets offside exits more often

TMK- especially 116gr.

which one has a bigger wound channel

If you get a “good” lot of ELD-M’s, they can have a slightly wider wound for the first half of the wound channel. But often they do not.

TMK’s do what TMK’s do to about the highest probability of any bullet.

which one causes more or less meat loss

TMK more if you hit big bone.

which one penetrates more tissue depth

TMK.

which one has the animal running less

TMK, though it can be difficult to see without large numbers of animals.

My 18" 6CM currently shoots the 108 and 109eldm well. 2910fps MV with the 109eldm. (.75moa with 8 shots) The kids and I have taken a number of deer, elk, and bears with both bullets. Lowest impact velocity with the 109eldm was about 2390fps (over 400 yards). Lowest impact velocity with the 108eldm was around 2150fps.

Just wondering what gains I might see switching to the 107/116 TMK.

More consistency lot to lot. ELD-M’s can be variable. They are still a good bullet, but with TMK’s the likelihood of a bullet failing to upset is close to zero.

Also, what have you settled on for the best adjusted BC for the 116tmk? If I read correctly, you found a .590 to be accurate early on, but later mentioned .600g1. Does the average BC change or drop for truing beyond a certain yardage? (Ie, is the posted/advertised BC of .609g1 for the 116tmk more likely to be accurate under 700 yards and a .590g1 more accurate over 1000 yards as the bullet drops in velocity?)

The difference between a .600 and a .609 G1 is not observable targets until way, way beyond terminal range. .609 G1 has done well out to 1,100 yards.

How accurate is the advertised .580BC for the 107TMK in any of your recent testing?

Thanks for all your work and insights here!

Most of my distance shooting with the 107gr was with a 6x45- so low MV. To the times that I sgot it (800y). I used a .574 G1, and that worked fine. But, like the 116gr .010 G1 BC points isn’t noticeable on target until well below 1,800fps impact.