Sierra Heavy TMK 6MM Testing

[Bluumoon]

Well stuffed 62g of n570 in the 6prc and didn’t reach any type of pressure but yield a velocity of 3260 about 30 fps faster the 109 eldm load I had. Grouped better than the 109’s. N565 at 60.5g yielded the same velocity but started getting into pressure and wouldn’t want to run it there.

What barrel length?

 

[NW_backcountry90]

What barrel length?

21”

 

[mtnbound]

Spun on a new 6CM barrel on my Tikka, so I did some load development today. H4350 and N555 are my tried and trued but gave some Superformance, Hunter, and 4831SC a go along with a few of the new 107TMKs. Only tried the TMKs with Hunter and 4831SC.

 

[huntsd]

Spun on a new 6CM barrel on my Tikka, so I did some load development today. H4350 and N555 are my tried and trued but gave some Superformance, Hunter, and 4831SC a go along with a few of the new 107TMKs. Only tried the TMKs with Hunter and 4831SC.

Good shootin! Hate to see the the 107s grouped the worst!

 

[brockel]

10rounds of 107tmk at 3100fps from 6prc

 

[nphunter]

5 rounds of 107’s from my .243, decent ES and SD, loaded up several more with this load and will shoot some bigger groups. Didn’t measure but it’s not much over 1/2”, if I could put 10 in a similar group I’d be pretty happy.

 

[Pistolpete28]

5 rounds of 107’s from my .243, decent ES and SD, loaded up several more with this load and will shoot some bigger groups. Didn’t measure but it’s not much over 1/2”, if I could put 10 in a similar group I’d be pretty happy.

View attachment 1034929

Nice shooting! Do you mind sharing your load? Are you using m+ mag?

 

[nphunter]

Nice shooting! Do you mind sharing your load? Are you using m+ mag?

Yes M+ Mags

H4350, 41.5gr
CCI BR2
Peterson Brass
COAL 2.918”, .020ish off lands
2760fps


16” barrel with a OG6.5 can

The load is a little hot, I had some light marks on a couple pieces of the brass but primers are fine. I’m going to stick with it if it shoots just as well next trip to the range.

 

[B_Reynolds_AK]

Yes M+ Mags

H4350, 41.5gr
CCI BR2
Peterson Brass
COAL 2.918”, .020ish off lands.

16” barrel with a OG6.5 can

The load is a little hot, I had some light marks on a couple pieces of the brass but primers are fine. I’m going to stick with it if it shoots just as well next trip to the range.

Velocity?

 

[nphunter]

Velocity?

2760fps

ES is right at 30 and SD is 10 for 3 different 10 shoot groups .015-.045 off