Quickload
- Thread starter tom308w
- Start date
Not enough information, for any accurate data.
OAL
Barrel length
Average case capacity of 02 in grains
What information are you actually looking for ?
Purely based on the info you have provided. You would need to get an average across a chronograph, to get a better idea.
Your data looks like a good safe (light) load.
MV around 2931fps with less than 50000psi (first plot)
You get to around max pressure @ 47gr of N160 with 3118fps although your powder is getting a bit compressed. (second plot)
Your COAL seems a bit short too ?
2.710" looks better, slightly less compression, pressure around 58000 and MV of 3094fps
MV around 2931fps with less than 50000psi (first plot)
You get to around max pressure @ 47gr of N160 with 3118fps although your powder is getting a bit compressed. (second plot)
Your COAL seems a bit short too ?
2.710" looks better, slightly less compression, pressure around 58000 and MV of 3094fps
Progress.............
So it's 1982 and I have just received my first chronograph: A Tepico Time-Meter. It is a complicated thing that measures in milliseconds and for every reading you needed to look into a little BOOK to convert those to feet per second. I'd used it before but a generous shooter gifted it to me. I want to make up a drop chart for metallic silhouette shooting but it's a Sunday afternoon at the range and the internet isn't around. My load is straight from the book so I know my load is 'safe' pressure-wise but accurate drop data is had to get. I have a 200 meter range so I measure the drop.
I know the velocity, and I know the drop at 200 meters.
I go to my library and pull out a fairly new BOOK called "Tables of Bullet Performance" by Phillip Mannes. And start thumbing through the pages. I find the velocity range and look to the drop at 200 yards. Nope. That one doesn't match but I'm close. I flip through a few more pages and find a velocity and 200 yard drop that matches my range results. I look to the left and the BC is printed at the header. The drift and drop out to to 1000 yards is listed. I make the note for my 7mm and go to bed happy. The data proved to be accurate at the next 500 Meter match. No Computer. No Internet. Just some range time and a $10 book. Sometimes apparent progress dulls wits and powers of reasoning.
The Internet is great and I'm not totally down on QL. Quickload has theoretical value when used with totally unknown variables. In the OP case however, it would be easy to check Vhit's data and see that he's over recommended Maximum with that charge. QuickLoad authors would tell him to default to Vhit's data regardless of what numbers their computer models generate. ~Muir
I know the velocity, and I know the drop at 200 meters.
I go to my library and pull out a fairly new BOOK called "Tables of Bullet Performance" by Phillip Mannes. And start thumbing through the pages. I find the velocity range and look to the drop at 200 yards. Nope. That one doesn't match but I'm close. I flip through a few more pages and find a velocity and 200 yard drop that matches my range results. I look to the left and the BC is printed at the header. The drift and drop out to to 1000 yards is listed. I make the note for my 7mm and go to bed happy. The data proved to be accurate at the next 500 Meter match. No Computer. No Internet. Just some range time and a $10 book. Sometimes apparent progress dulls wits and powers of reasoning.
The Internet is great and I'm not totally down on QL. Quickload has theoretical value when used with totally unknown variables. In the OP case however, it would be easy to check Vhit's data and see that he's over recommended Maximum with that charge. QuickLoad authors would tell him to default to Vhit's data regardless of what numbers their computer models generate. ~Muir
Muir,
Just like any manufacturers load data, QL is a tool, to get you into the right area. It's all THEORETICAL !
What is a powder, or bullet manufacturers load data based on ? There are so many variables, barrel length, twist, barrel finish, profile, all of which have an effect, that at best, data will be for the best common denominator !
Are you still using your Tepico Time Meter, and conversion book ?
Just like any manufacturers load data, QL is a tool, to get you into the right area. It's all THEORETICAL !
What is a powder, or bullet manufacturers load data based on ? There are so many variables, barrel length, twist, barrel finish, profile, all of which have an effect, that at best, data will be for the best common denominator !
Are you still using your Tepico Time Meter, and conversion book ?
No. I passed it on to a new shooter years ago. -Muir
Addendum: manufacturer's data is not theoretical. It is provisional. Manufacturers did the work on load development and it is accurate, provided similar parameters are used. QL is a software that does not guarantee the suitability of any data it generates.
Yes, I'm sure you now use something far easier, and quicker, even if it isn't anymore accurate ?
Do the powder/bullet manufacturers "GUARANTEE" the suitability of their load data ? I use a combination of QL, BT, and data from the manufacturers.
No load data is perfect. Some is better than others, and it really depends on how "off the shelf", standard barrel length, your rifle is.
The bottom line, is be sensible, and use what works for you !
It's amazing that anyone got anything loaded before Quick Load.~Muir
Your right @Muir it isn't the diffinite answer, but it does give a load of information that helps me 'develop' a load. It shows me (by using well proven math, above my capability) what the pressures are doing as the charge deflagrates (which is a great word). It indicates a top end and offers an insight to what is happening. It doesn't develop a load that suits the rifle but it is fast-tracking my understanding of whats going on. It allows me to see the effect of using different powders (with different burn rates), different bullet weights. There is so much that it doesn't do of course, more than it does to be sure. And your right, the manufacturers have developed loads that are safe, one or two of them may have even used QL .....
Not if they don't want to get sued into bankruptcy. Look at the disclaimer on QL results, at the bottom of every page: they do not guarantee the suitability of their data for loading. Think Vhit or Hodgdon would be in business for long if they put that in with their data? Would your confidence be high?? Probably not!
~Muir
Generally based on actual tests with a universal breach and actual pressure sensors....
Having actually operated and maintained a Wiseman Universal Pressure gun I can tell you that the data they provide is dearly bought. A certified barrel can run $5000 per chambering and they only last so long. They do not take the data they provide lightly and the price of a reloading manual proves it.~Muir
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