Sierra 107 TMK Load Data

[Nine Banger]

Haven’t really had any great groups using H4350. Decided to try H1000. No pressure signs, so I’ll step it up. 20” PBB hybrid lite and OG6.5 on a Tikka.View attachment 1059918

Nice shooting.

46.2 should be about jam full up to the neck, how much farther are you going?

N565 won't spike in a 6 creed case either.

 

[wy_will]

Nice shooting.

46.2 should be about jam full up to the neck, how much farther are you going?

N565 won't spike in a 6 creed case either.

I’ll probably try another 1/2 grain and see where that puts me.

 

[OFFSHORE]

View attachment 1052351View attachment 1052353
Repost for this thread. Average muzzle velocity over 100 rounds with this load ended up being 2960 fps. 21” barrel 1:8 twist.

Thats SMOKE"N for a 6ARC!!! Thats knocking on the door of a 6GT. . .good for you.

 

[Walker6]

Haven’t really had any great groups using H4350. Decided to try H1000. No pressure signs, so I’ll step it up. 20” PBB hybrid lite and OG6.5 on a Tikka.View attachment 1059918

Looks like you’re on to somethin!

 

[Pistolpete28]

Haven’t really had any great groups using H4350. Decided to try H1000. No pressure signs, so I’ll step it up. 20” PBB hybrid lite and OG6.5 on a Tikka.View attachment 1059918

That’s some good shooting! My groups were around 2” with the h1000 in a 243 tikka, so I went to h4350. I was getting 2970 fps average with a 20” barrel, so pretty fast.

 

[ztc92]

That’s some good shooting! My groups were around 2” with the h1000 in a 243 tikka, so I went to h4350. I was getting 2970 fps average with a 20” barrel, so pretty fast.

This was my experience as well. Much better with H4350 vs H1000

 

[huntsd]

@Q_Sertorius @Matt5266 @Sako300 @Pistolpete28 how did you guys come up with your coal? Picking a random measurement? Certain distance off lands? Going back to the range with 4350 and 40.5 grains with my 243 20” to see how it likes that combo

 

[Q_Sertorius]

@Q_Sertorius @Matt5266 @Sako300 @Pistolpete28 how did you guys come up with your coal? Picking a random measurement? Certain distance off lands? Going back to the range with 4350 and 40.5 grains with my 243 20” to see how it likes that combo

Magazine length for M+ magazines with a small fudge factor to ensure smooth feeding.

Edit - and my rifle hated M length magazine COAL (2.82”). That’s how I settled on ~2.94” inches.

 

[Lawnboi]

31 grains of varget in a dasher seems to be working well. Below groups were shot positional.

 

[Matt5266]

@Q_Sertorius @Matt5266 @Sako300 @Pistolpete28 how did you guys come up with your coal? Picking a random measurement? Certain distance off lands? Going back to the range with 4350 and 40.5 grains with my 243 20” to see how it likes that combo

M+ mags. Just started long based off what I had seen others doing. Made sure I wasn't in the lands. Originally shot 2.94 but I fell on 2.91. So to answer yes random measurement for me kinda.... wanted them to be long but cycle in my mag.

I actually went out again today because I swapped rings so had to resight. 2 low left were sight in. Adjusted and shot 10

I NEED MORE 107s! Haha

 

[huntsd]

M+ mags. Just started long based off what I had seen others doing. Made sure I wasn't in the lands. Originally shot 2.94 but I fell on 2.91. So to answer yes random measurement for me kinda.... wanted them to be long but cycle in my mag.

I actually went out again today because I swapped rings so had to resight. 2 low left were sight in. Adjusted and shot 10

I NEED MORE 107s! Haha

Great shooting what made your drop coal down to 2.91?

 

[ChrisAU]

31 grains of varget in a dasher seems to be working well. Below groups were shot positional.


View attachment 1060942

What speeds are you seeing with what barrel length at that charge?

 

[Matt5266]

Great shooting what made your drop coal down to 2.91?

Honestly just wanted to take advantage of the M+ mags, and went middle ground from what I had seen other guys doing. Really don't have a real reason just picked it and ran a small ladder with it

 

[Lawnboi]

What speeds are you seeing with what barrel length at that charge?

2740 in a 21” suppressed rifle.

Not pushing it at all.

 

[Pistolpete28]

@Q_Sertorius @Matt5266 @Sako300 @Pistolpete28 how did you guys come up with your coal? Picking a random measurement? Certain distance off lands? Going back to the range with 4350 and 40.5 grains with my 243 20” to see how it likes that combo

Groups were bad at the M mag length, so I went with an M+ mag and went as long as I could without having feeding issues. Groups tightened up and I just stuck with the length.

 

[prairieboy]

do these really need a 7.5 twist? from a smaller case like a 6mmbr?

 

[Mattyq17]

Tikka T3x 243 1-8 twist, 22" barrel, no suppressor or brake.
COAL 2.910
CBTO 2.280
1x fired starline brass
Fed 210
40.7 gr H4350
2965 fps
100 yards
Shot at 700' elevation
Loaded one each at 39.5, 40, 40.5, 41, 41.5
Slight bolt lift at 41.5 so dropped to 40.7.

I will shoot these at distance later this week.
I got some 116 I am going to try next but am happy with the 107 so far.

 

[Plague]

do these really need a 7.5 twist? from a smaller case like a 6mmbr?

They are stabilizing fine for me so far in an 8 twist 6 arc. I am stepping on them pretty hard, but haven’t had issues with stability out to 900 yards.

 

[ckt3]

30gr Lever, Hornady once fired brass, 107 TMK, COAL 2.275 (basically mag length in my Howa Mini) CCI 450. 70 degree day @ 2300.

I went up to 31gr of Lever at 2820 but had some heavy bolt. Accuracy wasnt great either and then 30.5 at 2770 didnt impress me a ton. 30.0 ended up working out with quick drop and didnt feel like I was anywhere near pressure. Definitely still need to play with it more though.

How has the temp stability been for you with Lever?

 

[shayes11]

How has the temp stability been for you with Lever?

I havent had a chance to shoot it in a big temperature variance yet, 50-75. So take what I say with a grain of salt.

Personally, I'm not super worried about it as far as affecting my POI during hunting season because I have zero intentions of shooting past 400. And I think I'm far enough away from pressure signs that I'm in the safe zone even if it does get hot. I will definitely test more throughout bear season and summer though.