Estimate velocity?

[DesertDug]

Is there a way to estimate bullet velocity? I know bc, gun powder, oal, etc for load data. Published velocities are for 59 grains 24" barrel, my load is 60 grains and 25" barrel.

Published velocity is 3124. Would it be safe to think I should be pushing around 3150 fps?

This is for a .270 load with 130g Nosler 130 g bullet. H4831sc oal 3.365 with .025 jump to lands for this riffle.

[cva34]

Whats the Diff...its fast

[Phillip Fields]

Other factors besides barrel length affect velocity so you may be getting more - or less than the published 3124.

[Zen Archery]

Just borrow a friends chrinographer.
But do you really need it?
Unless shooting into upper ordinance of that bullet you don’t really need numbers.

[az2tx]

Just borrow a friends chrinographer.
But do you really need it?
Unless shooting into upper ordinance of that bullet you don’t really need numbers.

Published velocities are a guide at best but could be off by a few hundred fps

[DesertDug]

reason is for dope card. I know I am good with 50 yard zero for 300 point blank. I also will need it to send to Leupold for CDS cap.

[WTucker]

reason is for dope card. I know I am good with 50 yard zero for 300 point blank. I also will need it to send to Leupold for CDS cap.

The best thing you can do in this situation is borrow or purchase a chronograph.

Edit: Also, shoot and verify your dope.

[xman59]

Is there a way to estimate bullet velocity? I know bc, gun powder, oal, etc for load data. Published velocities are for 59 grains 24" barrel, my load is 60 grains and 25" barrel.

Published velocity is 3124. Would it be safe to think I should be pushing around 3150 fps?

This is for a .270 load with 130g Nosler 130 g bullet. H4831sc oal 3.365 with .025 jump to lands for this riffle.

there is a point were barrel length can start to cause a bullet to slow down,, and no I do not think you are too long,,, like someone else already stated there are other factors than can effect velocity,, the chamber itself can, primers, bullet seating depth, the bore itself

[scott.str]

If doing for Leupold shoot it shoot it shoot it. 100,150,200,250 ect. The more data the better. Let them know drop from all those off your zero as I've used apps and put in my velocity and it wasn't close. Shooting it is dead on and they will use that data.

[catslayer]

Need to shoot farther than 200 to know anything... Human error WAY to high inside those range... 1-800 in 50 or 100 yard increments would get you there

[DesertDug]

thanks for all the input guys. Maybe Santa will bring me a chronograph. currently do not have access beyond 200yrd range.

[canny]

Chart your rifle and then use a ballistic calculator to compare drop to changes in velocity. I would set up a piece of plywood and have a target at the top. Shoot it at 200, 300, 400, 500 all while aiming at the target. Measure your vertical drop for each distance. Then use one of the free ballistic calculators, plug in all your variables such as bullet weight, BC, weather, etc and start playing with the velocity value. Compare the drop chart that is created with each velocity change to your real data and pick the one that is the closest fit. That will give you a good estimate of velocity, if you cannot track down a chrono.

[DesertDug]

Canny, you have a good idea. I have been trying to do this same thing but with only 50 and 100 yard references. Make good sense that I could get a lot closer if i have further distance variable to work with.

[canny]

Canny, you have a good idea. I have been trying to do this same thing but with only 50 and 100 yard references. Make good sense that I could get a lot closer if i have further distance variable to work with.

You can also send that dope data to Leupold and they use it to do CDS instead of plugging numbers into the Calculator. I plan on doing that with my 300 WBY next year and charting it out to 600 at least.

[DesertDug]

copy that.