Sierra Heavy TMK 6MM Testing

[ckt3]

Everything I’ve heard indicates stable. I plan to run it

 

[rbutcher1234]

Ok cool. I’d be doing it at 6 arc velocities.

 

[ckt3]

Ok cool. I’d be doing it at 6 arc velocities.

Funny you say that. I’m so torn on staying with 6 Creed/243 or switching to either 6 ARC or 6 GT. 20” barrel Tikka. I’d prefer to shoot something with lighter recoil to allow me to stay in the scope better. 243 has been snappier than I expected.

Anyone have experience with the relative recoil between the ARC and GT?

GT would be easier cause I can just rebarrel my Tikka. ARC has more factory ammo and less recoil. Can you easily spot shots with the GT in a light hunting rifle? I’ve never shot the ARC or GT

 

[Plague]

Anybody ran the 6mm 107 tmk through a 1:8 twist? Stabile or issues?

They have been fine for me thus far. 6 arc 1:8 twist 21” barrel. Unsure on velocity with the load, but I would say 2800fps or faster. 1200-2800 ft elevation. I would have to look back in my notes to tell you pressure and humidity.

 

[rbutcher1234]

Funny you say that. I’m so torn on staying with 6 Creed/243 or switching to either 6 ARC or 6 GT. 20” barrel Tikka. I’d prefer to shoot something with lighter recoil to allow me to stay in the scope better. 243 has been snappier than I expected.

Anyone have experience with the relative recoil between the ARC and GT?

GT would be easier cause I can just rebarrel my Tikka. ARC has more factory ammo and less recoil. Can you easily spot shots with the GT in a light hunting rifle? I’ve never shot the ARC or GT

I haven’t shot the arc in a comparable rifle to a GT, but I have shot my 6BR in a comparable rifle to a friends 6GT. 6 arc is functionally identical in recoil, powder, and velocity to the BR, so I believe this is fairly analogous. In this particular case, the BR and the GT were so functionally close. Between them though, I’d pick the arc for factory ammo availability and support.

 

[Pistolpete28]

Funny you say that. I’m so torn on staying with 6 Creed/243 or switching to either 6 ARC or 6 GT. 20” barrel Tikka. I’d prefer to shoot something with lighter recoil to allow me to stay in the scope better. 243 has been snappier than I expected.

Anyone have experience with the relative recoil between the ARC and GT?

GT would be easier cause I can just rebarrel my Tikka. ARC has more factory ammo and less recoil. Can you easily spot shots with the GT in a light hunting rifle? I’ve never shot the ARC or GT

The 243 with a 107 and h1000 is definitely snappy! I was surprised aswell, but still fun to be pushing the 107 at 2950ish fps with a 20” barrel.

 

[huntsd]

These bullets just don't seem to be picky.

Shot 4x 10 shot groups today with a Seekins 6 Creed PH2, with around 1400 rounds on it. All three bullets, plus one got a second group which was seated deeper.

View attachment 985211

Individual groups were between .6's and .8's (MOA). All 40 rounds laid overtop each other were right at one MOA.

View attachment 985213


Next I did 6 groups with my Dasher, all three bullets at two seating depths. This is the barrel from my No Clean Dasher Test, you can look up how it typically shoots Berger 109's.

View attachment 985214

The groups ranged from .4's to .7's (MOA). All 60 rounds together were right at .9 MOA.

View attachment 985215

Finally I did three more groups with the Tikka, jumping further this time.

View attachment 985216

These were fine, although the one impact to the right on the middle group did make it the worst of the whole test. .9's, 1.4's, and 1.0's for those three.

This aggregate is less impressive, but it's still ~ 1.6 for 60 rounds over three bullets, two charge weights, two seating depths, and two days.

View attachment 985219

Had a fantastic day for testing here, was in a t-shirt most of the time.

View attachment 985220

View attachment 985221

is this 1:8 243 tikka group using a 116 or the 107? wondering if the 116 will stabilize out of a 1:8 tikka 243

 

[Treelineasassin]

Funny you say that. I’m so torn on staying with 6 Creed/243 or switching to either 6 ARC or 6 GT. 20” barrel Tikka. I’d prefer to shoot something with lighter recoil to allow me to stay in the scope better. 243 has been snappier than I expected.

Anyone have experience with the relative recoil between the ARC and GT?

GT would be easier cause I can just rebarrel my Tikka. ARC has more factory ammo and less recoil. Can you easily spot shots with the GT in a light hunting rifle? I’ve never shot the ARC or GT

I've been shooting 107smk in a 10# 6arc 2750mv, shot some the 107tmk from equal weight 6gt this morning moving 2800-2900. The arc is in a manners, the gt in a McMillan Mtn Tracker LR (rokstok like ergos). The gt stayed on target better than the arc. The gt is 21in 7.5tw, and likes the tmk at 2830 and 2920. The brass looked good, primers are lil flat but zero lift or ejector marks. 2920 with 35gr powder in a 21in barrel is a lot of bang for your buck. I'll test some my 116s in the same barrel once the heavier tmk arrive. I have a feeling they'll run in that low 2800 range.

 

[Formidilosus]

is this 1:8 243 tikka group using a 116 or the 107? wondering if the 116 will stabilize out of a 1:8 tikka 243

Have you read the thread?

 

[Carl Ross]

is this 1:8 243 tikka group using a 116 or the 107? wondering if the 116 will stabilize out of a 1:8 tikka 243

Those are the heavies.

 

[sierracharlie338]

Funny you say that. I’m so torn on staying with 6 Creed/243 or switching to either 6 ARC or 6 GT. 20” barrel Tikka. I’d prefer to shoot something with lighter recoil to allow me to stay in the scope better. 243 has been snappier than I expected.

Anyone have experience with the relative recoil between the ARC and GT?

GT would be easier cause I can just rebarrel my Tikka. ARC has more factory ammo and less recoil. Can you easily spot shots with the GT in a light hunting rifle? I’ve never shot the ARC or GT

GT is a puddy cat but so is the arc. I prefer the GT bolt face over the arc and Hornady has now released the match 109s to other retailers than GAP.

As mentioned recoil basically the same amongst the small 6s imo. Spotting shots is easy. My GT is a tikka rebarrel and couldn’t happier.

 

[Hurley88]

Funny you say that. I’m so torn on staying with 6 Creed/243 or switching to either 6 ARC or 6 GT. 20” barrel Tikka. I’d prefer to shoot something with lighter recoil to allow me to stay in the scope better. 243 has been snappier than I expected.

Anyone have experience with the relative recoil between the ARC and GT?

GT would be easier cause I can just rebarrel my Tikka. ARC has more factory ammo and less recoil. Can you easily spot shots with the GT in a light hunting rifle? I’ve never shot the ARC or GT

Difference between 6ARC, 243, and 6.5CM in recoil, side-by-side in identical 8.5lb Tikkas…I had to close my eyes and put the recoil pad 1/8” off my shoulder to really call a clear & noticeable difference between the 243 & 6.5CM. But when I did that it got real clear real quick. Could barely tell the difference before the Bruce Lee test.

Then I suppressed the 243 and it was immediately & clearly less. Then, I did field positions to see the difference in spotting impacts, that’s where the 6.5CM began to lose. But just by a little bit.

But a suppressed 6ARC? Oh boy…

Point is, the shooter mechanics & rifle stock will matter way way more than 6ARC/6GT/243. And a suppressor definitely makes a difference. You already have a 243, buy a suppressor rather than a barrel. You’re literally doing the same thing with like 3-5gr less powder with the GT, I’d imagine you’ll feel zero difference after spending quite a bit of money.

 

[rbutcher1234]

Difference between 6ARC, 243, and 6.5CM in recoil, side-by-side in identical 8.5lb Tikkas…I had to close my eyes and put the recoil pad 1/8” off my shoulder to really call a clear & noticeable difference between the 243 & 6.5CM. But when I did that it got real clear real quick. Could barely tell the difference before the Bruce Lee test.

Then I suppressed the 243 and it was immediately & clearly less. Then, I did field positions to see the difference in spotting impacts, that’s where the 6.5CM began to lose. But just by a little bit.

But a suppressed 6ARC? Oh boy…

Point is, the shooter mechanics & rifle stock will matter way way more than 6ARC/6GT/243. And a suppressor definitely makes a difference. You already have a 243, buy a suppressor rather than a barrel. You’re literally doing the same thing with like 3-5gr less powder with the GT, I’d imagine you’ll feel zero difference after spending quite a bit of money.

I would piggy back this and say my experience in shooting a 6arc in a stockys vg (howa mini), tikka 16” 223 in factory stock with vertical grip module, 308 in my AIAT, and a 6.5CM tikka all in the same day, throughout timed positions as buddies and I were having a good fun training day:

The 6arc is so skewed in shootability towards the 223 side it’s not even funny. Yes it recoils a bit more, but muzzle jump and recoil is still so negligible that you really almost still do not have to try and have perfect fundamentals. You still just hit things quickly and spot impacts. Once you get up to the 6.5cm, it’s way more close to the 308 side of things. Fundamentals and technique matter a lot more. They keep you way more honest.

My experience is not analogous to the above because they were all identical rifles. Listen to what he says. Emphasis on his quote of “oh boy….” regarding suppressed 6ARC. Be honest with yourself on if you are going to train enough in the conditions where you will be hunting in order to take shots at game past 600 yards. If the answer is no, or you’re like me at 100% of game is already just killed at sub 450 (with 95% killed sub 300), then the ease of shooting, barrel life, performance of a 6arc is impossible to argue against. I’ll grant you have barely higher performance with the GT, but only at distances that don’t matter if you answered the question I posed a few sentences up. 6ARC is here to stay (DoD contract) and will have more available factory ammo. Getting your existing bolt face bushed is a $100 thing and that is inconsequential over the life of your first barrel and components, let alone a second barrel if you shoot this one out.

 

[shotoutofacannon]

Anybody ran the 6mm 107 tmk through a 1:8 twist? Stabile or issues?

It will be fine. I have run the 116 and 107 in my 243 tikka and both stabalize fine. I am at 6k feet, but if the 116 will shoot up here I wouldn't worry a bit about the 107 even at lower altitudes.

 

[806guns]

Decided to order 100 to make a dummy round for some 6mm-284 instead of doing a PRC.

 

[rbutcher1234]

It will be fine. I have run the 116 and 107 in my 243 tikka and both stabalize fine. I am at 6k feet, but if the 116 will shoot up here I wouldn't worry a bit about the 107 even at lower altitudes.

I appreciate that. I’m barely above sea level.

 

[justin davis]

Loaded up a ladder of N555 with the 116’s. 41 grains - 43.5 grains. 43.5 grains shot 2800 out of 18” barrel. It’s a new barrel with only a few shots in it. No pressure signs at 43.5. Gonna load up 20
at 42 grains and shoot them at 100 and at distance to see how they shoot. Looks like they are gonna shoot awesome!

Alpha brass SRP
Cc 450 primers
2.89 col

Tikka action chambered in 6 creedmoor with Bartlien 18” barrel 1:7.5” twist.

 

[B_Reynolds_AK]

Loaded up a ladder of N555 with the 116’s. 41 grains - 43.5 grains. 43.5 grains shot 2800 out of 18” barrel. It’s a new barrel with only a few shots in it. No pressure signs at 43.5. Probably load up 20
at 42 and shoot them see how they shoot. But looked promising!!

Can you give cartridge and barrel specs along with that Justin? Twist/throat etc