6.5x284 velocities

[Gmerc]

Hello all.
Wondering if anyone can give me some advice on velocity.

I am shooting a Sako 75 chambered in 6.5x284. It was a factory 6.5x55 Swede 1:8 twist 24” varmint barrel and was rechambered to 6.5x284.

I have tried various loads, most recently 57 and 58 grains of retumbo, shooting an 140gr Eld-m and the best velocities I am generating are around 2770.

From everything I have read I should be getting closer to the 2900-2950 range?

Any ideas?

Should I re barrel and try a 26” or perhaps move it on and start again with a 6.5prc?

Cheers

 

[Aftermath]

https://hodgdonreloading.com/rldc/

I don't know...this chart shows quite a lot less powder but none are Retumbo. Velocities are right around 2700 fps. When you filter using Retumbo as the powder, the 6.5x284 does not even show up.

For what it's worth, I get 3250 fps with Berger 140 Hunting VLD with a 280 Ackley and a 26" barrel. Super accurate. I'd have to go check the notes but I am pretty sure I am using H4350.

 

[Bemoni]

Retumbo might be too slow for a 140 grain.
I'we got a 6,5 -284 too and are using Reload Swiss RS 70 for most of my loads, but i'm aware it might be hard to find in AUS.

So, instead i would look for Vithavouri 165 or Reloader 22 and a magnum primer for a better result.
And, be careful, as with all flat-shouldered cartridges, the 6,5 - 284 is very prone to carbon build-up, the one of mine, needs cleaning after every 150 rounds.

 

[tekmann2377]

+2 on Retumbo being too slow. A good burn rate is between H4350 and H1000. N165, N560, H4831, etc are more suited for this. You will get much better results.

 

[Gmerc]

Thanks for the advice guys. I do have 4831sc and h1000 I can try. See how those go. The Vithavouri will be harder to track down but gives me somewhere to start.
Much appreciated.
I’ll let you know how it goes

 

[abn31c]

Rl23 is the best in mine with 130 and 140. Very low ES/SD. CCI 200's.

 

[Gmerc]

Rl23 is the best in mine with 130 and 140. Very low ES/SD. CCI 200's.

The Allianz powders are also very difficult to find here unfortunately but I will try to track some down.
What velocities are you getting with rl23 and 140’s?

Rl23 is the best in mine with 130 and 140. Very low ES/SD. CCI 200's.

alliant* (damn auto correct)

 

[tekmann2377]

It is very hard, if not impossible, to find RL22 or 23 ANYWHERE now. I would trial a Hodgdon or Vihtavouri powder instead.

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