|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Today's Posts | Search |
|
Thread Tools | Search this Thread |
January 4, 2019, 12:16 PM | #1 |
Senior Member
Join Date: April 19, 2005
Location: Left coast
Posts: 610
|
How important is velocity
Greetings all,
A quick question to rile up the masses and maybe some knowledge from the local grey beards. When hand loading, how important is it to keep track of the exact velocities of your loads? Does one really need to know the extreme spread, standard deviation, averages and all such mathematical bothering? I understand that inconsistent velocities will result in increased vertical stringing of groups, but surely with projectiles of the same weight and powder charges of the same weight, you've done all you can to make the velocities as consistent as possible. If the groups are consistent, predictable, and tiny, what use then, is knowing the velocity? Aside from additional calculations for energy and such. Is it even possible to get those tiny groups without that information? Thanks for the help all. Sent from my Pixel 2 XL using Tapatalk |
January 4, 2019, 01:40 PM | #2 |
Senior Member
Join Date: December 28, 2009
Location: North Central Illinois
Posts: 2,710
|
I don't own a chronograph, and have only shot through one five times to get velocity in a class I took on long range shooting. Used the velocity to figure bullet drop at 1000 yards. The rifle I was using was zeroed at 300 yards. Knowing the true velocity then figuring the "come up" got me on paper at 1000 yards first try. Matter of fact, it got me in the black at 1000 yards. Other than that, I don't see a real need for a chronograph. A hole in the X-ring doesn't care how fast the bullet was traveling.
|
January 4, 2019, 01:41 PM | #3 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
go to a ballistics computer such as the JBM calculator and plug in your bullet weight, diameter, and BC then try different velocities and see for yourself how much drop is involved on your loads at the distances you will be shooting
For my current load going from 2950 FPS to 2975 FPS I have .3 inch difference at 300, 3.3 inch difference at 800, and 7 inches at 1000. That is with a hot load on a high BC bullet
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
January 4, 2019, 01:51 PM | #4 |
Senior Member
Join Date: February 13, 2002
Location: Canada
Posts: 12,453
|
Being able to keep track of the exact velocities of your loads is a relatively new thing. Chronographs becoming less expensive(And Internet forums thinking they're necessary.) have made it possible. Accuracy is far more important.
Ballistics computers and programs are just that. Computer programs that cannot consider every single variation that's possible. Not to mention they're written by a programmer who likely have never seen a real firearm. Just like computer 1st person shooting games.
__________________
Spelling and grammar count! |
January 4, 2019, 02:17 PM | #5 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
well I can shoot a round across my $100 chronograph, jump on my ballistics calculator on my cell phone, plug the numbers in and go from a 100 yard sero to 800 yards and be within a MOA at 800 on the first shot. I guess accuracy is in the eye of the beholder. At medium and long ranges consistent velocity is necessary for accuracy unless you want to shoot the target in the knee
Now if all I did was shoot 75 and 100 year old antiques at 50 and 100 and hope for a 2 inch group on a good day I doubt I would bother with either the chrono or the balistics calculator
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek Last edited by hounddawg; January 4, 2019 at 06:07 PM. |
January 4, 2019, 02:22 PM | #6 | |
Senior Member
Join Date: November 26, 2016
Posts: 1,570
|
Quote:
Caliber? |
|
January 4, 2019, 02:27 PM | #7 |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
even with handguns if you are doing competition you have to maintain a power factor level for your loads. Go to any IDPA or USPCA match with a low charge powder puff load to minimize muzzle jump and you will be disqualified
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
January 4, 2019, 02:30 PM | #8 |
Senior Member
Join Date: April 19, 2005
Location: Left coast
Posts: 610
|
At the moment I'm loading for .577-450 and 11mm Mauser. I am considering loading and casting for .308 since I have three rifles in that cartridge and I don't take them out as often as I'd like.
Unfortunately the only ranges available locally are up to 100 yards Sent from my Pixel 2 XL using Tapatalk |
January 4, 2019, 02:59 PM | #9 |
Senior Member
Join Date: January 2, 2015
Location: The swamps of WNY
Posts: 753
|
I don't NEED a chrony, but have had one for 25 years. They help.
For example. Getting 700 fps for a Hollow Base Wadcutter, or 675, or 750 fps for 200 SWC when I am shooting Bullseye. Chrony loads to make sure they are near what they are supposed to be. Building loads for a rifle. I do ladder tests. It works. I guess its a tool, not necessary, but sure makes things easier if you load for accuracy. "How much do I lose from a 6" 38 to my 2" 38?" My 5" 45 to my 3.5" 45?" I load 32-20 for silhouette. They have a 1450 fps limit. David |
January 4, 2019, 03:01 PM | #10 | |||
Senior Member
Join Date: October 23, 2005
Location: US
Posts: 3,657
|
Quote:
Quote:
Quote:
__________________
Support the NRA-ILA Auction, ends 03/09/2018 https://thefiringline.com/forums/sho...d.php?t=593946 |
|||
January 4, 2019, 03:05 PM | #11 |
Senior Member
Join Date: April 12, 2010
Location: Lake Martin, AL
Posts: 3,311
|
To me not much. I can see where it could be extremely important for those into competitive shooting or in certain career fields such as professional snipers. I suspect those folks using suppressors want to monitor their subsonic loads.
|
January 4, 2019, 03:41 PM | #12 |
Senior Member
Join Date: June 23, 2013
Location: Central Taxylvania..
Posts: 3,609
|
I loaded and shot to about 300 yards for a couple of years without a chrono.
I use mine quite a bit now. For rifle and pistol. Pistol is mostly for my carry ammo. Because of the short barrels on my carry guns (shorter than what is normally tested for caliber in manuals) i want to make sure i have enough velocity for a HP to expand properly. As for rifles, it is as Hounddawg has said. I do however shoot 600-800 yards and use the truing function in my ballistics calculator. Also as for ES/SD, i had a powder bullet combo do ok at 100. Terrible at 300. Found out my ES/SD were way high. Switched powders and grouped much better at all distances. Cartridge in question was 7mm -08AI with 140gr Berger and CFE 223. Switched to PP2000.
__________________
When our own government declares itself as "tyrannical", where does that leave us??!! "Januarary 6th insurrection". Funny, I didn't see a single piece of rope... |
January 4, 2019, 04:04 PM | #13 |
Senior Member
Join Date: April 10, 2008
Location: Alaska
Posts: 7,014
|
I will probably get a Labradar in the near future (my chrono just up and quit a while back)
For me it allows me to get a load in the area of a different powder that the bullet preformed well in before. Its useful, not a have to.
__________________
Science and Facts are True whether you believe it or not |
January 4, 2019, 04:24 PM | #14 |
Senior Member
Join Date: November 18, 2005
Location: On the Santa Fe Trail
Posts: 8,249
|
It really depends on you, IMO chronographs are a money and time saver. If you're a competitor I'd say they're invaluable as a shooting tool. I use them to get me on target faster downrange and to tell me if my reloading process is sound. Once you start realizing there is more to be learned than how fast your bullet is leaving the muzzle then you see more benefits to having a chronograph.
__________________
NRA Life Member |
January 4, 2019, 04:45 PM | #15 |
Senior Member
Join Date: November 17, 1999
Location: NW Wi
Posts: 1,671
|
Personally would not be developing/loading higher pressure pistol or rifle without one. While not an absolute measure of pressure, you're velocities are indicative. If you shoot long enough strings, es and sd might be useful. Some may not shoot long enough strings, but simply look for obvious variations. Am more interested in av velocity, and how temp or other conditions affect it. Chronographs can be relatively inexpensive. Newer ones appear extremely handy and less pia at the range.
As others stated, having your velocity is huge time saver for sight adjustment at longer distance. The programs are that good. Am still checking them, but they are close. |
January 4, 2019, 05:08 PM | #16 |
Senior Member
Join Date: November 23, 2008
Posts: 1,091
|
If you’ve never used one, you don’t know how useful they can be. If you have one, you can’t do without it.
|
January 4, 2019, 08:29 PM | #17 | |
Senior Member
Join Date: December 28, 2009
Location: North Central Illinois
Posts: 2,710
|
Quote:
|
|
January 4, 2019, 08:38 PM | #18 |
Senior Member
Join Date: May 15, 2012
Location: Texas
Posts: 2,566
|
Except for power factor requirements velocities aren't important to me at all, accuracy IS.
|
January 4, 2019, 08:42 PM | #19 |
Senior Member
Join Date: January 2, 2015
Location: The swamps of WNY
Posts: 753
|
We can load with a hammer and a LEE Loader. It goes up from there.
I have an old progressive press and old Crony. This is my second one, I shot the first. David Sent from my SM-T900 using Tapatalk |
January 4, 2019, 08:53 PM | #20 |
Senior Member
Join Date: June 15, 2008
Location: Georgia
Posts: 10,809
|
When hand loading I use my chronograph to warn me if I'm approaching an overload. If the manuals say that 60 gr of powder is supposed to be 3000 fps I want to know if I'm getting close to 3000 fps with my loads. Most of the time, with most components, and most rifles the manuals will be pretty predictable.
But with some combo's I've seen rifles exceed the expected velocity several grains below the listed max. I might find that 58 gr of powder gives me 3000 fps with certain combo's. Without knowing my speed I might assume that a load 2 gr below max was perfectly safe. And it may not be. I'm not one to try to push the envelope and develop "hot" loads. But at the same time if I'm shooting a 30-06 I don't want to be loading it to 300 Savage levels either. I don't worry too much about Standard Deviation or Extreme spread. If you're shooting at 1000 yards then it matters. Even when hunting at 400+ yards 25 fps variance just doesn't matter much. Nor does squeezing the last possible 50 fps out of a round. Knowing the exact MV can be used to calculate drops and energy downrange. But the fact is that trajectory between all of the common cartridges and bullets is remarkably close. At 300 yards a 30-06 shooting the same bullet 200 fps faster than a 308 only has 2" less drop.
__________________
"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong" Winston Churchill |
January 4, 2019, 10:28 PM | #21 | |
Senior Member
Join Date: March 1, 2009
Posts: 4,232
|
Quote:
good to know, I want to try some Bullseye pistol this year, I used to be a fair pistol shot but fell out of practice after a broken ankle and now I really suck. No more IDPA or USPCA but I always wanted to try Bullseye
__________________
“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek |
|
January 4, 2019, 11:27 PM | #22 |
Senior Member
Join Date: January 2, 2012
Location: Minnesota
Posts: 3,876
|
I'm not to much of a paper target shooter. Nor do I have a angst to own a chronograph. I am old school.
I just home-reload my cartridges to a velocity where it and smallest grouping are at there pinnacle at the further-est distance I intend to aim too. Having a couple years experience in reloading I learned early on best pay attention to a brass's base and general over-all appearance inside & out when reloading to near or above Max published loadings. Fast is Flat. Fast increases Energy. So_ I believe to be. Quite different from other relaoders I rely on seamless tempered barrels of modern metals having chamber & bore proof tested before my purchasing. If it wasn't? My reloads would be appropriate for damascus shooting. |
January 5, 2019, 12:42 AM | #23 | |
Senior Member
Join Date: July 28, 2007
Location: Ohio
Posts: 11,756
|
Quote:
The gentleman who wrote the ballistic software that I use is active on this site, in these forums.
__________________
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss. |
|
January 5, 2019, 07:46 AM | #24 |
Senior Member
Join Date: February 12, 2013
Posts: 669
|
Are you hunting animals, or paper targets?
If you are hunting paper, velocities are probably irrelevant - somewhere between minimum and maximum is the most accurate load, which can be found by experiment. Others are correct that for other cartridges and other purposes, it is important to KNOW your velocities - for power factor in IPSC and similar, and to try to stay supersonic at distance for very long range precision target work. The stuff OP is shooting is probably already subsonic within the 100 yards they have available, but that's not meant as an insult - it's just the nature of the beast. |
January 5, 2019, 08:58 AM | #25 |
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 18,543
|
Do short range (100-300 yd) benchrest shooters rely on chronographs?
I bet the 1000 yard shooters do, I know I did for F class. BPCR, too. If I were loading .577/.450 and 11mm Mauser for 100 yards with black, I wouldn't bother. If I were working on nitro for black loads, I definitely would Chrono. Probably for cast .308s, too. |
|
|