Sierra Heavy TMK 6MM Testing

[Formidilosus]

Honestly, any decent 6mm projectile does that in a Dasher over 30 grains of Varget!

That was the point.

 

[jjohnsonElknewbie]

Weatherby's long freebore came from necessity more than anything. Roy was a true believer in ballistic superiority and that speed killed. The problem in that day and age was that the cases and actions that were available couldn't contain the pressure he needed to create the fastest 30 cal magnum on the market. He achieved the extra speed by lengthening the feebore, which essentially changes the pressure curve, and allowed him to pump the velocities much higher than any other cartridge that was commercially available.

With that said, you have always been able to achieve some impressive accuracy without seating at or into the lands. Other cartridges also had long, long, long throats like the 6.5x55 and the 7x57 to name a couple. Some of these cartridges also could shoot accurately, but maybe not to the same level they could if you could have reached close to the lands with a bullet.

That's where todays new cartridges really do shine. So many guys poo poo them because the cartridges they know and have loved accomplish similar goals. And honestly, in a lot of ways they do. The big thing that's different though is the fact that all these modern cases have much less need of being able to touch the lands to create top end accuracy. The case dimensions, shoulder angle, and especially the freebore clearance (distance on either side of the bullet as it transitions from the case to the lands) all lend themselves to allow for bullets to engrave straight into the bore, which in turn delivers very good accuracy without the type of gyrations we used to have to go through to see cartridges perform.

Thank you for the information in this and previous posts. It just reinforces my love for my black sharpie and "crude" and "caveman" seating depth process. I use the same process for 7-08, 25-284, and 6.5 WSM, with every different bullet, and the result is always the same- excellent accuracy without any extra tools or fuss.

 

[eric1115]

@Formidilosus is the .574/.292 G1/G7 on the website for the 107 a typo? That seems very high for the stated design goals and comparable bullets. Way higher than 108 ELDM and right there with the 109 ELDM and right in the same range as you guys were getting for the 115-117.

 

[letrbuck]

So it looks like it's the 116 that Sierra settled on?

 

[brockel]

So it looks like it's the 116 that Sierra settled on?

Wonder if it will stabilize from an 8” twist at 3000’

 

[wind gypsy]

@Formidilosus is the .574/.292 G1/G7 on the website for the 107 a typo? That seems very high for the stated design goals and comparable bullets. Way higher than 108 ELDM and right there with the 109 ELDM and right in the same range as you guys were getting for the 115-117.

If it shoots like the 107 smk, that’ll be a bad ass bullet. Got a feeling if those numbers are real that it might be a bit more picky.

 

[ID-Muley]

If it shoots like the 107 smk, that’ll be a bad ass bullet. Got a feeling if those numbers are real that it might be a bit more picky.

I’d sure like @Formidilosus or somebody to chime in on those numbers. I jus don’t see it but I could be wrong…

 

[YukonCorneliusAurelius]

So……RokSlide group buy of the 107s and 116s?

 

[wind gypsy]

So……RokSlide group buy of the 107s and 116s?

Something tells me Sierra doesnt need to fuss with group buys to sell a pile of them.

 

[PathFinder]

So……RokSlide group buy of the 107s and 116s?

They may as well. We're going to end up with 90% of them one way or the other.