Achieving accurate load at 2921fps muzzle for 6.5 Creedmoor?

I am working up a load for my 6.5 creedmoor with the new A5 McMillan stock. The rifle has a Mauser action and the cheek piece was not designed for it. I would not recommend anyone use a Mauser action with any McMillan stock. That said, I came across a hot load from Berger in their ammunition: Berger Match Grade Ammunition 6.5 Creedmoor 130 Grain Hybrid OTM Tactical with listed muzzle velocity of 2921fps. I don't think this can't accurately be achieved with Varget or H4350.

What powder do you use to achieve high muzzle velocity for 130grain OTM Berger?

 

My 6.5 Creedmoor's go faster with RL 17. Might also try Superformance.

 

+1 on this. 2900+ fps is going to be a bit of a stretch. Superformance is very dense, high energy powder, probably your best shot. But not going to be a temp-stable powder like H4350.

 

So what is the problem with the Mauser and the cheek ? Bolt wobble , bolt release , bolt hits ? I can't think of a situation that a Winchester 70 , or any other action wouldn't have .

 

Getting this with the 130 otm and RL26.

 

That's freakin impressive!!!
Elaborate on your rig please.
SRP, or LRP, Cases used, barrel length?
I'm running 2741 with rl26 and 140vlds
22" factory barrel.
I'm figuring I can get to 2760 or so with
136Scenars in my set up.

 

Barrel length should be stated.

 

It’s a seekins havak rifle with a 24” rock creek button barrel. I’m using nosler brass and a 210m lrp. The data is straight off of the berger website. The bullet is a 135 gr. classic hunter. The chronograph shot is with 49.1 gr RL26. It also shoots a nice little cloverleaf at 100. I mis-spoke above and said 130 otm....lol. I do have some of them loaded with RL16.

 

This is the 130 otm and RL16. Darn close to the berger load above. This one shoots great too and is my hunting load.

 

I don't shoot 130-grain bullets in my Creed, but Re17 gets me 3000+ with that class of bullet in my .260. I would bet that it would get close with the Creed, also.

 

Yep. RL 17 was really fast for me too, but accuracy was not as good with it for me.

 

I get 2,860 with the Berger 135 and 47gr RE26 in a Browning 26" HC rifle. That's still below Berger's max listed charge.
I have some groups hovering at 1.5" at 400yds.

 

Note the extended bolt assembly. It is a couple of inches longer and will interfere with the cheek piece on many custom stocks.

 

But that's not a Mauser . It is LIKE a Mauser . When using Mausers 98 action , bolt handle cuts and cheek mods are usually mandatory . The CZ bolt shroud is no longer than a 98 . The CZ shroud just extends back and covers the cocking piece . Working with the various 98 designs and variations require some modifications to almost any stock with an adjustable cheek .
Good luck on your 6.5

 

And its also not fair to say ANY mcmillan stock. Matter of fact that one model may be the only one with issues. Your gunsmith should have caught that when he bedded it for you. Its an easy and known issue it takes a few minutes to fix.

 

Perhaps I did not explain the situation on the CZ 550/750 Mauser type action. I was in close communication about the CZ550 action, but McMillan had to subsequently fix the problem. I am happy with the result. However, the issue could have been prevented with some measurements of the CZ550 action they had in house and the adjustment of the cheek piece. Note that McMillan told me they only stock they recommended was the A5. A simple QA/QC issue that was resolved. Note the CZ750 resolves this issue with a cheek piece that starts further back to avoid interference. I doubt many people use these actions so it's a bit of trivia.

The main topic was the load work up. A bit of research revealed 43.2grains H4350 at 2850fps with COAL 2.816 for magazine feed. My PRS friends recommended staying with H4350 over the hotter powders to reduce variation due to ambient temperatures.

 

Or try h4831sc. It may not be the fastest horse in the stable, but it'll be in the hunt when it comes time to look at targets.

 

R 26 is the real deal in the creed. Bergers is the only published data I can find. I ran a pressure ladder with a 140 eldm and got to 3000 with no obvious pressure signs. Now I don't doubt that 3000 is at or above saami max but I think 2850-2900 is doable. We'll see how the brass holds up. 26" savage fwiw.

 

I believe you're correct. I was chatting with a guy at a match about a month ago who was pushing 147s at ~2950 out of a 30" tube with RL26. Also saw his 500 yard load workup targets at that speed, and they were like ~2" 5-shot groups .

If I could find a keg of it anywhere, I'd grab one and test it out myself; I know I've seen similar reports posted online of folks getting 6.5x284 speeds with this powder.

As far as RL16, I could only get it to run around H4350 speeds.

 

I appreciate everyone contributing their thoughts on this load workup. My objective is to spend 1000 hours range time at Fouled Bore Precision. I am not a competitive shooter at this point and just enjoy improving my shooting under field conditions.
FYI a book recommended to me a few years ago at the gunsmith school at Murray State. They build a rifle with an old action as part of training. Thanks again!