6.5 creedmoor , 100g Barnes TTSX advice

[Dave_45]

Hi folks

As the thread title somewhat eludes to...

I have a 6.5 cm Alan Maughan semi custom rifle.
Tikka T3 action , brux 24 inch 1/8.5 twist..

I plan to run Barnes 100g ttsx as my stalking round for all species.
What speeds are capable , that still bring accuracy?
Is 3200 possible?

 

[JH83]

Hi folks

As the thread title somewhat eludes to...

I have a 6.5 cm Alan Maughan semi custom rifle.
Tikka T3 action , brux 24 inch 1/8.5 twist..

I plan to run Barnes 100g ttsx as my stalking round for all species.
What speeds are capable , that still bring accuracy?
Is 3200 possible?

I run a 55 with 100g TTSX through a sassen 1:8.5 26” and get over 3300fps so you might well get to those velocities.

 

[Edinburgh Rifles]

theoretically yes
Only your barrel will tell you what is actually possible
but why?

Run them that fast for sub 300m terminal velocity and expect to have variable terminal efficacy
There is a sweet spot for all monolithics when it comes to terminal velocity
I suspect that is above the point where a 100gr will hold onto its petals and produce a shank (which without petals attached as it spins can wobble and tumble) and one-four petals which will go off on a tangent.

In testing the bullets that produce the best terminal effect without frangibility have maintained their mass and their petals

 

[Dave_45]

theoretically yes
Only your barrel will tell you what is actually possible
but why?

Run them that fast for sub 300m terminal velocity and expect to have variable terminal efficacy
There is a sweet spot for all monolithics when it comes to terminal velocity
I suspect that is above the point where a 100gr will hold onto its petals and produce a shank (which without petals attached as it spins can wobble and tumble) and one-four petals which will go off on a tangent.

In testing the bullets that produce the best terminal effect without frangibility have maintained their mass and their petals

Excellent response as ever Mr B.

Would you mind selling me one of your V3 please , I enquired last night

 

[Edinburgh Rifles]

No problem
give me or the shop a bell today
Plenty in stock

 

[takbok]

theoretically yes
Only your barrel will tell you what is actually possible
but why?

Run them that fast for sub 300m terminal velocity and expect to have variable terminal efficacy
There is a sweet spot for all monolithics when it comes to terminal velocity
I suspect that is above the point where a 100gr will hold onto its petals and produce a shank (which without petals attached as it spins can wobble and tumble) and one-four petals which will go off on a tangent.

In testing the bullets that produce the best terminal effect without frangibility have maintained their mass and their petals

The 100gr TTSX out of the creedmoor will have similar velocities to some of the 110gr TTSX 270 Win loads which don't seem to have have these perceived problems.

I've shot a few TTSX bullets at up to 3650 fps MV this year. They work well and penetrate linearly whether they fragment or not (50-250m so far)

 

[Dave_45]

The 100gr TTSX out of the creedmoor will have similar velocities to some of the 110gr TTSX 270 Win loads which don't seem to have have these perceived problems.

I've shot a few TTSX bullets at up to 3650 fps MV this year. They work well and penetrate linearly whether they fragment or not (50-250m so far

 

[Dave_45]

Did you get those speeds with the 270?

 

[Dave_45]

The 100gr TTSX out of the creedmoor will have similar velocities to some of the 110gr TTSX 270 Win loads which don't seem to have have these perceived problems.

I've shot a few TTSX bullets at up to 3650 fps MV this year. They work well and penetrate linearly whether they fragment or not (50-250m so far)

Did you get those speeds with your 270?

 

[takbok]

Did you get those speeds with the 270?

No, that's 50gr TTSX out of my 220 Swift. The 270 will achieve those sort of velocities with the 95gr TTSX - worth a try when/if scottish legislation allows lighter bullets.

I get around 3400 fps with 110gr GSC bullets in my 270.

 

[Edinburgh Rifles]

The 100gr TTSX out of the creedmoor will have similar velocities to some of the 110gr TTSX 270 Win loads which don't seem to have have these perceived problems.

I've shot a few TTSX bullets at up to 3650 fps MV this year. They work well and penetrate linearly whether they fragment or not (50-250m so far)

They may still work but you are relying on sheer velocity rather than the design features built into the bullet.

this is what happens at terminal velocities above 2900-2950 ft/s;
The left hand recovered bullet, loss of petals, tumbling shank, lightweight petals often at a tangent to primary wound tract losing velocity very quickly.
You can see it in numerous gel videos but in the field it presents as small entry, larger exit but longer recorded, post-impact running ranges.

 

[takbok]

@Edinburgh Rifles I get very different results. I get a bigger entry wound and smaller exit with high terminal velocity bullets. I don't see any signs of the shank tumbling at all, and this will almost always exit on a deer shot side on. The lost fragments damage internal organs so are penetrating enough to assist (obviously depends on deer size as the petals from a lighter 50gr Barnes might not make it through a red shoulder).

One of the reasons that I like copper bullets like Barnes & GS is that they will penetrate no matter how fast you shoot them.

 

[The deer man]

I run a 55 with 100g TTSX through a sassen 1:8.5 26” and get over 3300fps so you might well get to those velocities.

I'd be very interested in your load details and COL used.

So far I've tried Barnes 127gr, 120gr and 100gr and the pattern looks more like a shotgun firing SSG!

I've use RS60, RS62, Reloder22, CFE223 and used COL's between, I think 2.830" and 2.985" in approximately 0.015" increments. The best COL accuracy was 2.870" giving a 2" group - RUBBISH! There might have been a couple of other powders but my notes are in the workshop.

These have been the worst bullets I've ever had the misfortune to develop a load for, any pointers VERY welcome.

The rifle is a Sako 85 (22.441" barrel / 1:8 twist) and happily shoots sub 1/2" (and even better) groups with Sierra 140gr SP, 120gr SP and 100gr Varminter.

 

[JH83]

I'd be very interested in your load details and COL used.

So far I've tried Barnes 127gr, 120gr and 100gr and the pattern looks more like a shotgun firing SSG!

I've use RS60, RS62, Reloder22, CFE223 and used COL's between, I think 2.830" and 2.985" in approximately 0.015" increments. The best COL accuracy was 2.870" giving a 2" group - RUBBISH! There might have been a couple of other powders but my notes are in the workshop.

These have been the worst bullets I've ever had the misfortune to develop a load for, any pointers VERY welcome.

The rifle is a Sako 85 (22.441" barrel / 1:8 twist) and happily shoots sub 1/2" (and even better) groups with Sierra 140gr SP, 120gr SP and 100gr Varminter.

It’s 49.6g RS60, COL 2.940

Small groups and velocity to spare-deer a very much allergic to it, from munties to large stags nothing ventures far. A friend is experimenting with a factory length sako 85 and is getting 3150fps if I recall.

 

[The deer man]

It’s 49.6g RS60, COL 2.940

Small groups and velocity to spare-deer a very much allergic to it, from munties to large stags nothing ventures far. A friend is experimenting with a factory length sako 85 and is getting 3150fps if I recall.

Thanks for that, is that with the 100gr?

 

[JH83]

Thanks for that, is that with the 100gr?

Yes 100gn TTSX

 

[Selous]

I'd be very interested in your load details and COL used.

So far I've tried Barnes 127gr, 120gr and 100gr and the pattern looks more like a shotgun firing SSG!

I've use RS60, RS62, Reloder22, CFE223 and used COL's between, I think 2.830" and 2.985" in approximately 0.015" increments. The best COL accuracy was 2.870" giving a 2" group - RUBBISH! There might have been a couple of other powders but my notes are in the workshop.

These have been the worst bullets I've ever had the misfortune to develop a load for, any pointers VERY welcome.

The rifle is a Sako 85 (22.441" barrel / 1:8 twist) and happily shoots sub 1/2" (and even better) groups with Sierra 140gr SP, 120gr SP and 100gr Varminter.

Have you cleaned the barrel back to bare metal?

 

[The deer man]

Have you cleaned the barrel back to bare metal?

Yes I have. Keep a very strict cleaning regime with all my rifles and they all, until now, shoot sub 1/2 MOA.

However I think I've found the problem. It's called not reading the script correctly! I read COL 2.940" as 2.840", I know I've needed new reading glasses for the last year but...! Will try again...

 

[Boosh]

Some interesting reading catching up on this for myself.
Occasionally drag the 260 out to take the odd fox at distance.
After reading discussions on here that ELDM do a decent job on deer, and they are not just a target bullet I put a load a very accurate load together with the 120 grn ELDM at 2950 fps.
Out of the first 6 foxes I shot, 4 of them hit the ground, but not as motionless as my 243 does it with 65grn vmax.
The round just pencilled through easily, may be better on deer, less meat damage.
Would you guys imagine the TTSX in 100 grn pushed hard out of 24 inch 1-8 barrel would see more expansion on a fox than the ELDM.
(Imagine it would be an big improvement).