Sierra Heavy TMK 6MM Testing

[Jordan Smith]

“OR” elevation, temp, pressure, and humidity.

Just pointing out that it’s just temp, pressure, and humidity needed, assuming you use absolute pressure.

 

[Speaks]

I use most all of them. Shooter is what I personally choose.

Was just looking and didnt see either 77tmk, 108eldm, 103 eldx, or any 224 eldx in their bullet library.

 

[Formidilosus]

Back to the thread topic...


When did it go from "large 6MM TMK" to "entire line of high BC TMKs"

Kind of all at the same time. The heavy 6mm was the catalyst I suppose as it had been pushed for, for so long.

and will you/others be testing the other new ones in the lineup?

Yes.

 

[Formidilosus]

Was just looking and didnt see either 77tmk, 108eldm, 103 eldx, or any 224 eldx in their bullet library.

I dont generally use bullet libraries. Input the bullet info and BC and go.

 

[86indy]

That’s one of the best cross section jobs I’ve seen. What tool? I use my grinder and vice like some kind of mongrel.

A mill. It’s not perfectly down the center due to just clamping in a vise.


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[mxgsfmdpx]

I dont generally use bullet libraries. Inout the bullet info and BC and go.

This is the way. I’ve seen so many bugs and discrepancies with prebuilt libraries over the years in the Apps/Engines that I don’t trust them.

 

[ACHILLES]

Just pointing out that it’s just temp, pressure, and humidity needed, assuming you use absolute pressure.

I was referring to absolute pressure using shooter. It’s just temp and DA



I know AB has temp, pressure, and humidity then just converts it for you to show the DA at the bottom.

 

[TimberHunter]

Siding for pressure input? I’m not sure what you’re asking.

Generally solvers are set up to run DA and temp or Elevation, pressure(HG), humidity, and temp.

Sorry I meant what are you guys inputting for pressure into JBM bullet stability. It only asks for pressure and temp as environmental inputs


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[ACHILLES]

Input the pressure for the lowest elevation areas and temps you plan to shoot in.
I used 27.75 at 30* which is close to 1000DA

 

[Pilsner]

Good thing for you guys is I'm a sucker for a little peer pressure.

Remember, it is not peer pressure - it is just your turn.

 

[wysongdog]

Mine 6um has been on order since 11/1/24. Id really like my stock to show up so I can start playing with it. Probably not going to be able to get these to play with for a while anyways so it’s not a big deal

 

[ID-Muley]

Mine 6um has been on order since 11/1/24. Id really like my stock to show up so I can start playing with it. Probably not going to be able to get these to play with for a while anyways so it’s not a big deal

If you haven’t been in contact with an update, pm me your info and I’ll look into it.

 

[passinggas33]

So help me understand thinking here (or at least where my mind has gone)…IF these bullets perform on game as is hoped, does this make this the bullet of choice for the 6UM for ALL big game? I’ve seen comments related to the DTAC on deer sized game not performing exactly as desired, but being darn near perfect for elk. Does the 115-117 create a one and done bullet for both the deer and elk? Or is it too early to tell?

 

[Formidilosus]

Does the 115-117 create a one and done bullet for both the deer and elk?

Yes.

 

[warrbuk]

Yes.

Are these bullets wanting to be 060-.080 off the lands like the DTAC?

In regards to COAL will the current freebore dimensions be optimal for these TMK’s ?


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[Formidilosus]

Are these bullets wanting to be 060-.080 off the lands like the DTAC?

In regards to COAL will the current freebore dimensions be optimal for these TMK’s ?


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I don’t measure how far my bullets are off the lands as it doesn’t matter. Make sure it isn’t touching rifling and that it has some room.

Thread 'Painless load development (mine)'

Oct 25, 2021

I have had multiple people ask me to lay out how I do load development being that what I do is different. Since Shaen @Shooter71 just rebarreled a Tikka 595 in 6XC I thought it would be easy to show how I do it. It’s a Master Sporter with a T3 lite profiled 20” barrel- keep in mind it is a T3 LITE barrel. So by conventional “wisdom” it should be more picky and less accurate than a heavy barrel. His work is shoddy (), but I bet I can overcome it.

The rifle-


First was @Unknown Munitions factory load with 105gr Berger Hybrids. 5 rounds to zero, 5 for a...

• Formidilosus
• Replies: 1,205
• Forum: Reloading

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[Carl Ross]

Are these bullets wanting to be 060-.080 off the lands like the DTAC?

In regards to COAL will the current freebore dimensions be optimal for these TMK’s ?


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While they weren't picky, they averaged shooting tighter groups jumping .070"-.080" vs .030"-.040"

The nose is long vs the common 108-109 options, jumping ~.030" put me essentially at mag length in all three rifles I tried. That hasn't been the case with say 109 ELD's or 109 Hybrids. Since they seemed to shoot better jumping farther, it seems like it's no factor.

 

[khuber84]

I'm pretty sure this 115-117gr bullet will be the choice for anything 6mm 50gr capacity or above. The 107tmk will give another 100fps ceiling possibly. I imagine the 107 from an Arc at say 2600-2700 would be bad medicine out to 700y maybe 800y, and still achieve reliable bullet upset. This is all theoretical, but if these all perform similar to 95/77tmk, life will be good!

 

[B_Reynolds_AK]

While they weren't picky, they averaged shooting tighter groups jumping .070"-.080" vs .030"-.040"

The nose is long vs the common 108-109 options, jumping ~.030" put me essentially at mag length in all three rifles I tried. That hasn't been the case with say 109 ELD's or 109 Hybrids. Since they seemed to shoot better jumping farther, it seems like it's no factor.

This is in your Seekins 6 CM correct? If so, SAAMI freebore of .183.

Seated at .080 off, where does this put the boat tail to shoulder junction in the case?
Wondering if a longer fb, such as the PVA Standard (.210) might optimize these even more.

Any chance you could take a photo of a loaded round with a bullet lined up next to it?

@khuber84 I think a short 6 CM slinging these 117’s at 2800-2850 would be absolutely phenomenal.

 

[Carl Ross]

This is in your Seekins 6 CM correct? If so, SAAMI freebore of .183.

Seated at .080 off, where does this put the boat tail to shoulder junction in the case?
Wondering if a longer fb, such as the PVA Standard (.210) might optimize these even more.

Any chance you could take a photo of a loaded round with a bullet lined up next to it?

@khuber84 I think a short 6 CM slinging these 117’s at 2800-2850 would be absolutely phenomenal.

The 6 Creed was a Seekins, yes. I don't have any ammo for it loaded up at the moment. I'll see if I can make a little time tomorrow. Regarding a longer freebore, I think that'd depend on your mag constraints and how much jump you wanted, along with boattail to shoulder junction. The longer seated rounds were right at binderless AICS mag length.

The 24" Seekins was making 2960 fps without concerning pressure signs, fwiw.