|
|
Joined: Mar 2008
Posts: 281
Campfire Member
|
OP
Campfire Member
Joined: Mar 2008
Posts: 281 |
Are there any programs that I can enter data on my reloads to and get close to the velocity? I know it's not going to be exact but close. Looked in reload manuals and they are to vague.
|
|
|
|
|
Joined: Sep 2003
Posts: 14,807
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Sep 2003
Posts: 14,807 |
You can make a ballistic pendulum.
I made one years ago before the modern chrono's came out.
All guns should be locked up when not in use!
|
|
|
|
|
Joined: Sep 2004
Posts: 14,186 Likes: 1
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Sep 2004
Posts: 14,186 Likes: 1 |
Are there any programs that I can enter data on my reloads to and get close to the velocity? I know it's not going to be exact but close. Looked in reload manuals and they are to vague. Make it up! 
Well we're Green and we're Gold, and we play better when it's cold. All us Cheese heads have our favorite superstar. We love Brett Favre.
|
|
|
|
|
Joined: Jan 2007
Posts: 11,586 Likes: 6
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Jan 2007
Posts: 11,586 Likes: 6 |
well if your rifle is accurate enough you can measure drop from like 200 to 800 yards but that is still kinda if'ee if you can find the "advertised" BC of the bullet you are shooting
Last edited by ldholton; 11/06/12.
|
|
|
|
|
Joined: May 2009
Posts: 17,283 Likes: 4
Campfire Ranger
|
|
Campfire Ranger
Joined: May 2009
Posts: 17,283 Likes: 4 |
save and get a chrony. They are not expensive anymore
|
|
|
|
|
Joined: Sep 2012
Posts: 884
Campfire Regular
|
|
Campfire Regular
Joined: Sep 2012
Posts: 884 |
If you shoot at a large range or club, there will usually be someone their with a crony set up. Offer them ten to twenty dollars to test your load. Obviously, this would be after you have worked up an accurate load to establish long range drop tables and not just playing around while working up loads. If you "take over" someone's valuable range time, you may not be welcome the next time. Given the low prices of good units, you should consider buying one if you have a number of guns and/or plan on doing serious long range shooting.
Rich or poor, it pays to have money.
|
|
|
|
|
Joined: May 2009
Posts: 17,283 Likes: 4
Campfire Ranger
|
|
Campfire Ranger
Joined: May 2009
Posts: 17,283 Likes: 4 |
|
|
|
|
|
Joined: Jun 2011
Posts: 10,895 Likes: 67
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Jun 2011
Posts: 10,895 Likes: 67 |
I would do this:
From your cartridge reloading data on the powder manufacturer's website, a velocity range will be listed for your powder charge range and bullet weight.
Make an educated guess at your actual velocity
Go to JBM Ballistics Computer, a free ballistic computer online, enter ACCURATE atmospheric and equipment data and print a drop chart out to 1000 yards.
Go to your club and shoot at known ranges as far out as you can using the printed data. If it is incorrect, adjust your scope till you are making solid hits and notate the correct drop data.
Go back into JBM and adjust the velocity input till drop output matches your actual shooting.
Done.
The people wringing their hands over Trump's rhetoric don't know what time it is in America.
|
|
|
|
|
Joined: Nov 2007
Posts: 19,722
Campfire Ranger
|
|
Campfire Ranger
Joined: Nov 2007
Posts: 19,722 |
Well that will work great if you have an accurate BC for your bullet. But they have been known to fug a little to sell bullets.
NRA Lifetime Member
|
|
|
|
|
Joined: Mar 2008
Posts: 281
Campfire Member
|
|
OP
Campfire Member
Joined: Mar 2008
Posts: 281 |
I like rcamuglia's suggestion, makes sense, but how do I find an accurate BC chart, now?????
|
|
|
|
|
Joined: Nov 2007
Posts: 19,722
Campfire Ranger
|
|
Campfire Ranger
Joined: Nov 2007
Posts: 19,722 |
Access to a chrony is too easy get the real numbers and stop guessing.
NRA Lifetime Member
|
|
|
|
|
Joined: Oct 2011
Posts: 86
Campfire Greenhorn
|
|
Campfire Greenhorn
Joined: Oct 2011
Posts: 86 |
JBM has most of the popular bullets listed in a drop down at the top of the page. I've used this method out to 800yds and it will get you on paper. I have a 300yd range at the house and would see how much drop between 100 and 300. Then I would adjust velocity numbers till I came up with the right drop at 300. Yes I know, I need a chrony.
|
|
|
|
|
Joined: Mar 2001
Posts: 12,159
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Mar 2001
Posts: 12,159 |
I like rcamuglia's suggestion, makes sense, but how do I find an accurate BC chart, now????? It'd be much easier just to find someone with a chrony and shoot a couple of rounds through it. If you're coming through east central mississippi then stop and use mine. It takes me all of 30 seconds to set it up.
|
|
|
|
|
Joined: Mar 2008
Posts: 281
Campfire Member
|
|
OP
Campfire Member
Joined: Mar 2008
Posts: 281 |
Thanks for all your help, had some cabelas bucks to use and have one on the way!!!
|
|
|
|
|
Joined: Jun 2011
Posts: 10,895 Likes: 67
Campfire Outfitter
|
|
Campfire Outfitter
Joined: Jun 2011
Posts: 10,895 Likes: 67 |
Everything I'm saying here is under the context of Long Range.
You'll find that the more you use the Chrono, the more you really don't need one.
The BC's listed from many sources, whether they be from the manufacturer or a ballistic program's library are accurate. The bullet's BC can vary out of different barrels anyway.
What really matters is how your groups are at long range on paper.
If you have a lot of vertical dispersion, you probably have inconsistent velocity as well as the bullet exiting after the barrel swing has peaked and started down again.
Find a load with zero vertical at long range, ballpark the velocity by using load data and enter everything into your program. Adjust velocity to make actual drop data match the ballistic program's output. You can even tweak the bullet's BC a touch if needed.
I have a Chronograph and use it during development just to determine if the load component combo is giving me the velocity I want and expect. Other than that, the proof is in the shooting.
The people wringing their hands over Trump's rhetoric don't know what time it is in America.
|
|
|
|
|
Joined: Jun 2006
Posts: 46,146 Likes: 7
Campfire 'Bwana
|
Campfire 'Bwana
Joined: Jun 2006
Posts: 46,146 Likes: 7 |
You'll find that the more you use the Chrono, the more you really don't need one......
I have a Chronograph and use it during development just to determine if the load component combo is giving me the velocity I want and expect. Other than that, the proof is in the shooting. I know that what you said was in the context of long range, but how do you get there without first using a chronograph in load development, as you said at the end of your post? Seems to me that whether you need a chronograph all depends on your purpose. Personally, I'd just buy a chrony and be done with it. Without one you could spend a lot of time messing around developing loads that are accurate at 100 yards only to find out you're not getting the velocities you want once you switch to long range. Versus using a chrony and knowing the velocities right off the bat and switching to a different powder if you're not getting the velocities you want. You might burn up enough components guessing to pay for a chrony.
A wise man is frequently humbled.
|
|
|
|
|
Joined: Nov 2005
Posts: 6,168
Campfire Tracker
|
|
Campfire Tracker
Joined: Nov 2005
Posts: 6,168 |
I made a search for a chrony on ebay, It took me a couple months but in the end I picked up my chrony F1 new for $50.
For a shooter and reloader, particularly for one that will shoot at long range $50 or $100 for a chrony is money well spent.
Its amazing the number of loads that are 100+ FPS slower or faster than the book suggests. Its just a key item for load devlopment.
When I set mine up at the range its not uncommon to have folks want to shoot over it. I won't let others shoot over it, but I will shoot their rifles over it. I never thought of charging for a velocity check.
The collection of taxes which are not absolutely required, which do not beyond reasonable doubt contribute to public welfare, is only a species of legalized larceny. Under this Republic the rewards of industry belong to those who earn them. Coolidge
|
|
|
|
|
Joined: Apr 2009
Posts: 1,200
Campfire Regular
|
|
Campfire Regular
Joined: Apr 2009
Posts: 1,200 |
Everything I'm saying here is under the context of Long Range.
You'll find that the more you use the Chrono, the more you really don't need one.
The BC's listed from many sources, whether they be from the manufacturer or a ballistic program's library are accurate. The bullet's BC can vary out of different barrels anyway.
What really matters is how your groups are at long range on paper.
If you have a lot of vertical dispersion, you probably have inconsistent velocity as well as the bullet exiting after the barrel swing has peaked and started down again.
Find a load with zero vertical at long range, ballpark the velocity by using load data and enter everything into your program. Adjust velocity to make actual drop data match the ballistic program's output. You can even tweak the bullet's BC a touch if needed.
I have a Chronograph and use it during development just to determine if the load component combo is giving me the velocity I want and expect. Other than that, the proof is in the shooting. I have read this reply 6 times now........sorry you have no [bleep] idea of what you are talking about......very funny though  
|
|
|
|
|
Joined: Apr 2009
Posts: 1,200
Campfire Regular
|
|
Campfire Regular
Joined: Apr 2009
Posts: 1,200 |
I made a search for a chrony on ebay, It took me a couple months but in the end I picked up my chrony F1 new for $50. Sorry you wasted $50 on worthless POF......save a few more $ and get a real chronograph ,get an Oehler or keep guessing
|
|
|
|
|
Joined: Oct 2004
Posts: 1,522
Campfire Regular
|
|
Campfire Regular
Joined: Oct 2004
Posts: 1,522 |
How do you know if the chrono is accurate? How do you calibrate it?
futuaris nisi irrisus ridebis
|
|
|
|
|
535 members (1minute, 2500HD, 1badf350, 270cowboy, 12344mag, 10gaugemag, 56 invisible),
2,337
guests, and
1,348
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
Forums81
Topics1,193,168
Posts18,503,103
Members73,993
| |
Most Online11,491
Jul 7th, 2023
|
|
|
|
