Velocity question with 6.5 Creedmoor

[woods89]

I have a 6.5 Creedmoor built on a Remington model seven action with a 22" Hawk Hill barrel. Recently I started working with H4350 and 140 grain Elite Hunters.Primers are CCI BR-4 and brass is Lapua small primer. I did a sort of ladder test between just under 40 grains to 42.5. I hit what I would consider some pressure signs at just over 42. ( sharp edge on primer dimples, slightly sticky bolt, etc.) I had what appeared to be a good node at 41.3 that did indeed turn put to be a very accurate load, certainly better than my shooting ability. Primers with this load have a fully rounded edge, crisp dimple, and bolt lift is really slick.
I dont own a chronograph so this afternoon while shooting with my brother I set targets at 200 and 400, shot a 5 shot group at a high aiming point, and measured the difference. I input that info into strelok with all the current conditions and found out the only way to make my numbers line up was with a velocity of 2900 fps.
So do I have a very fast barrel? Am I running over pressure without signs? I see guys post about running 42-43 grains with less velocity than that. This is fine with me, but I do not want rifle damage and would also like to optimize brass life. I was going to be really happy with 2700....
I also realize that this is not quite like measuring with a chronograph but the numbers seemed to line up shooting steel at 500 also.
I will take any advice I can get. Thanks!

 

[Mulyhuntr]

No way you’re at 2900. For reference, I get 2640 with 41.5gr h4350 and a 143 eldx. 24” barrel.

2700 seems reasonable.

 

[Muledeerfanatic]

I use Hornady brass 43 gr H4350 and 140 eldm
Getting 2780 out of a 22" barrel

 

[woods89]

After thinking about this while weedeating for an hour, I'm inclined to say that something does have to be off in my calculations.
I know there are fast barrels and slower barrels but this seems unrealistic....
I did have one other issue that I dont think is related, but possibly could be. My rifle has a 20 moa base, and I just replaced my scope. New scope is a 4-12x40 Vortex Viper with a BDC reticle. I was not able to get it to zero right on at 100, as with my elevation turret bottomed out I was still 3.5" high at 100. I didn't think this would matter if I only measured the difference in drop between 200 and 400. Essentially I had a zero of 3.5" high at 100. It has been awhile since I was in math class though so who knows. Needless to say I have a 0 moa base on the way.
I was able to string together a pretty good run of consecutive hits on a 10" gong at 500 using 2850 and doing some creative math to account for my weird zero situation. And almost all of them were in the top half of the gong.
I will get that new base mounted and try again maybe. I really need a chronograph......

 

[MidGAHunter]

Something is off with your calculation. I'm running 41.3 grains H4350 in Alpha brass with 140 grain ELD-Ms and getting 2705 fps (measured with Magnetospeed) out of a 24 inch barrel. For comparison, Hornady Match 140 grain ELD-M ammo also runs 2705 out of my barrel.

 

[woods89]

And yes, their was a fly in the ointment. I think I found it and if I'm correct, my velocity will be around 2675 or so. I knew better.......