Sierra 153 TMK Load Data

[Firestone]

I had full intentions to test all the new TMK’s and was honestly pretty excited to do so. But after seeing the bullet quality and how the 107’s & 116’s shot vs. Berger’s, I scrapped the whole idea. Wasted enough time and money on the 6mm stuff.

I have around 450 of them left over

 

[Meller18]

Thought I’d start a thread for the 153’s now that all the new TMK’s are starting to show up.


Seekins Element Hunter w/Airlock ZG6.5
6.5PRC
Brass: ADG (new)
Primer: Fed 210m
COAL: 3.000
Powder: N565
56.5: 2708fps
57.0: 2746fps
57.5: 2772fps
58.0: 2810fps
58.5:2826fps
I had zero signs of pressure throughout.

View attachment 1044608

I’m going to load up 10 at 58gr and see how they shoot. The 3 PRC’s I’ve loaded for in the past were 57-58gr’s of N565 with the Berger 156’s.

This is 5 @ 58gr of N565 with the Berger 156’s I had loaded for another rifle. They averaged 2776 with an ES of 19.1 and an SD of 6.8.
View attachment 1044609

How are you getting up to 57 58 gr of powder?

 

[Treelineasassin]

How are you getting up to 57 58 gr of powder?

Running in excess of saami max anticipated pressure of course

 

[david2duck]

I set my scale to 57gr and when it hits 57gr I pull it and dump it in the case.

All jokes aside a quick google search for 150-156gr bullets will show you up to 58/59gr of n565. I loaded for 3 diff 6.5PRC’s and 156gr Berger’s and all of the were 57-58grs of 565.

 

[MCGHeel]

I have around 450 of them left over

What did you have left over? If you still have them PM me i may take them off your hands.


Sent from my iPhone using Tapatalk

 

[Meller18]

I set my scale to 57gr and when it hits 57gr I pull it and dump it in the case.

All jokes aside a quick google search for 150-156gr bullets will show you up to 58/59gr of n565. I loaded for 3 diff 6.5PRC’s and 156gr Berger’s and all of the were 57-58grs of 565.

Sorry to ignorant. But I can’t any published book that has 153gr and N565 up that high. You got a link?

 

[Blake C]

Update:

First 5 @ 58gr of N565
View attachment 1047969

Immediately reloaded and shot 5 more
View attachment 1047986

All 10 rounds averaged 2807fps with an extreme spread of 25.7 and a SD of 7.3

The mirage off the ZG6.5 after about 5-6 shots is pretty rough. Next time I’ll shoot 5 and then wait a good 5-10 min before shooting again. @Formidilosus or anyone else have any tricks for being more consistent once the mirage starts to get bad or is it just purely a waiting game?

Letter barrel cool to ambient temperature. First five look great.
58g of 565 is looking slow to me.
Mine is 156 berger, 58g 565, 2940fps.
Maybe the 153 has so much barrel contact its slow?