Savage 22-250 55grn Vmax

[Marksman_92]

Greetings,

I took my Savage 12 FV (26'' barrel) out today and shot my usual Hornady 22-250 55 grn vmax factory ammo and discovered my dope was a little off. The dope I did have for this rifle was taken in the warmer months but today it was about 38 degrees here in Indiana and I havent got great data for this gun in colder weather. At 300 yards I did not notice any difference in my dope but out at 400, 500, and 600 there was a significant change....

In warmer months I have been seeing a projected velocity of 3910 according to the Vortex LRBC program. The following is a breakdown of what I am getting in warm vs colder months:

Warm Weather (80 degrees):
Velocity: 3910 (According to Vortex LRBC)
400 Yards- 4 MOA
500 Yards- 6.5 MOA
600 Yards- 9.5 MOA


Cold Weather(38 degrees):
Velocity: 3740 (According to JBM Ballistics)
400- 5 MOA
500- 7.5 MOA
600- 10.75 MOA

I have not been able to run this ammo across a chrono to see what my actual velocities are but I wanted to see what you guys thought? Would the cooler weather really be changing my velocity by up to 170 FPS due to a 40 degree temp change? I will add that the barrel is currently sitting at approximately 460 rounds.

Thanks,
Blake

 

[CJS-6.5]

Different lot of ammo? I have seen over 100 fps variation on different lots of factory ammo.

 

[spife7980]

No idea what powder is in the factory rounds but you can test it.
Stick some rounds in the truck and put them in front of the heater blowing full blast, keep them there until you fire them. See if your old dope lines up again. Or just keep them inside your jacket against your body to keep them warm.

Looks like they are all just about 1 moa off-ish. Your zero is still good?

 

[Marksman_92]

No idea what powder is in the factory rounds but you can test it.
Stick some rounds in the truck and put them in front of the heater blowing full blast, keep them there until you fire them. See if your old dope lines up again. Or just keep them inside your jacket against your body to keep them warm.

Looks like they are all just about 1 moa off-ish. Your zero is still good?

Yea zeroed right before extending out to distance.

 

[supercorndogs]

You sure your getting 3910 with a 55g bullet in a 22-250. Thats really fast, I would not expect it in factory ammo. I wouldn't expect to get that reloading, I couldn't even get 50g v max going that fast without pressure signs.

3740 sound too fast also.

 

[Marksman_92]

You sure your getting 3910 with a 55g bullet in a 22-250. Thats really fast, I would not expect it in factory ammo. I wouldn't expect to get that reloading, I couldn't even get 50g v max going that fast without pressure signs.

3740 sound too fast also.

Like I said I have not run it across a chronograph, that is matching up my data to a ballistic app and the velocity is what they are providing.

 

[rweaver00geo]

Something isnt right. Im assuming you are using hornady varmint express part #8337 as I am not aware of a superformance loading in 55gr. The box list the velocity as 3680 fps. Out of a savage axis 22-250 with only a 22" barrel that load ran over the chrono at about 3560 Fps. I would estimate that you would only get 30-50 fps more per inch of barrel. I also have a savage 12 with a 26" barrel and im pushing a 55gr bullet at 3330 where that same load in my 16" AR is closer to 3000.

 

[CJS-6.5]

The 50vmax that Hornady lists at 4000 fps ran 3780 at the highest out of my 22" barrel. Also it was horribly inconsistent. I also tried Superformance powder behind 53 vmax and it was horribly inconsistent as well. In fact I don't like Superformance powder for anything. To fix your problem I would start reloading with quality components, using proven load data to achieve consistency.

 

[supercorndogs]

What scope? How is the tracking and RTZ?

 

[Marksman_92]

What scope? How is the tracking and RTZ?

SWFA 10x, great for the value.