Sierra Heavy TMK 6MM Testing

[cq0302]

The one that comes with it.

View attachment 1029304View attachment 1029309

Did you expand necks before loading or go straight to loading virgin brass


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[Lawnboi]

Uncovered you can pour cold water over it, I’m not patient enough to allow cooling time trying to get 20-30 round groups.

I normally just use a cover. Havnt gotten around to ordering one for mu OG65.

Today it was especially bad. Sun, snow, gusty wind, humidity in the air. Was a crappy day to shoot honestly.

 

[Nine Banger]

Did you expand necks before loading or go straight to loading virgin brass


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This brass probably has 10-14 firings. I make my own brass from 6.5 creed factory loads.

I'm going to load the rest of my 107s at 40gr H4350 2.800" (6 creed)

Quick Drop friendly on 16" barrel.

This is 40gr H4350:

 

[2Stamp]

These arrived today. Will hopefully pick up some 116 when available.

 

[waspocrew]

Got my 107s in today as well. Will probably try these out in my 6 ARC first. Need my Rokstok to show up before I get serious with any load development though (factory Tikka stock is not my fave).

 

[coya]

6creed
41.9 imr4350
2.800
2982fps
Same ring indent I get on the 77s from hornady custom grade die.
Shot a very similar group to 108eldm

 

[cq0302]

This brass probably has 10-14 firings. I make my own brass from 6.5 creed factory loads.

I'm going to load the rest of my 107s at 40gr H4350 2.800" (6 creed)

Quick Drop friendly on 16" barrel.

This is 40gr H4350:

View attachment 1029314View attachment 1029315View attachment 1029316

Right on, I’ve found pulling the seating stem and wrapping a bullet in a small piece 3m 400grit sand paper, or some valve lapping compound, to work well. I prefer sand paper as it’s easier and I still shoot the bullet. I’m sure lapping compound is more precise, but it take a couple sacrificial bullets.


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