Forums
New posts
Search forums
What's new
New posts
New Trophy's
New trophy room comments
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Classifieds
Trophy Room
New items
New comments
Latest content
Latest updates
Latest reviews
Author list
Series list
Search showcase
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Tennessee Gun Owners Forums
Reloading
Why are velocity nodes so important?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="jlanecr500" data-source="post: 5105085" data-attributes="member: 16430"><p>When referred to as velocity nodes, people get the wrong impression. What it all boils down to is barrel time. Obviously, the hotter the charge, more velocity is gained and it is possible to advance to the next node or barrel time. Generally, nodes are around a couple grains apart on say 308, 30-06, etc. A few years ago, I spent a lot of time, research, money learning about nodes, barrel time, barrel harmonics, etc, including pressure trace equipment and load development software. Being as I use it for smokeless muzzleloading, I am not limited to case capacity. There were no loads out there for advanced ignition 40 and 45 caliber sml's and without proper tools, things can get super dangerous in a hurry. So I built a 45 sml with a 1.385" straight barrel 28" long on a Savage large target action nutless like a Remington. I obtained, developed, and verified a calibration load for the pressure trace equipment. I also built a 40 cal similarly. When I built the 40, there were no really good bullets out there so Kyle Pittman, owner of Pittman Bullets designed a line of cup and core high bc 40cal bullets. When he got the first test bullets, he brought 12 of each weight of 225gr, 250gr, and 275gr to the Norris rifle range. I brought my new 40 cal sml with a Rock Creek 1:13.2 twist barrel at 28".</p><p>Being that we had never shot those bullet weights, much less those bullets, we were in the dark on loads. I had already spent a great deal of time with Quick Loads and barrel times that were already established through another developer. I ran loads with various powders, looking to obtain barrel times that matched established nodes, that were in a stable pressure range (45 to 65kpsi). The following pics are of targets on that test day. Mind you these are untuned loads. I took vials with these charges and that is all we had, along with12 bullets of each weight.</p><p></p><p>My spare time is valuable to me but I also like to pass on knowledge that I have acquired because it is super interesting to me. I am willing to do a series of threads over a period of time explaining this matter and giving links so that you can see for yourself, but I'm not going to take a beating on here over it. You guys can decide up front how it's gonna be and we will go from there. I do not proclaim to be a know-it-all, I just want to share information. Granted, with rifles, it is all pretty much figured out but I can show without a doubt how it works. Here are the targets. Remember, these are untuned loads calculated on the computer, measured and poured down the barrel with a bullet design that had never before been fired in any gun on the planet. Notice I hit 3 different nodes with the same bullet and powder just with different charges. The pics are out of order but it is easy to see the increased charges and velocities. [ATTACH=full]73307[/ATTACH][ATTACH=full]73312[/ATTACH]</p></blockquote><p></p>
[QUOTE="jlanecr500, post: 5105085, member: 16430"] When referred to as velocity nodes, people get the wrong impression. What it all boils down to is barrel time. Obviously, the hotter the charge, more velocity is gained and it is possible to advance to the next node or barrel time. Generally, nodes are around a couple grains apart on say 308, 30-06, etc. A few years ago, I spent a lot of time, research, money learning about nodes, barrel time, barrel harmonics, etc, including pressure trace equipment and load development software. Being as I use it for smokeless muzzleloading, I am not limited to case capacity. There were no loads out there for advanced ignition 40 and 45 caliber sml's and without proper tools, things can get super dangerous in a hurry. So I built a 45 sml with a 1.385" straight barrel 28" long on a Savage large target action nutless like a Remington. I obtained, developed, and verified a calibration load for the pressure trace equipment. I also built a 40 cal similarly. When I built the 40, there were no really good bullets out there so Kyle Pittman, owner of Pittman Bullets designed a line of cup and core high bc 40cal bullets. When he got the first test bullets, he brought 12 of each weight of 225gr, 250gr, and 275gr to the Norris rifle range. I brought my new 40 cal sml with a Rock Creek 1:13.2 twist barrel at 28". Being that we had never shot those bullet weights, much less those bullets, we were in the dark on loads. I had already spent a great deal of time with Quick Loads and barrel times that were already established through another developer. I ran loads with various powders, looking to obtain barrel times that matched established nodes, that were in a stable pressure range (45 to 65kpsi). The following pics are of targets on that test day. Mind you these are untuned loads. I took vials with these charges and that is all we had, along with12 bullets of each weight. My spare time is valuable to me but I also like to pass on knowledge that I have acquired because it is super interesting to me. I am willing to do a series of threads over a period of time explaining this matter and giving links so that you can see for yourself, but I'm not going to take a beating on here over it. You guys can decide up front how it's gonna be and we will go from there. I do not proclaim to be a know-it-all, I just want to share information. Granted, with rifles, it is all pretty much figured out but I can show without a doubt how it works. Here are the targets. Remember, these are untuned loads calculated on the computer, measured and poured down the barrel with a bullet design that had never before been fired in any gun on the planet. Notice I hit 3 different nodes with the same bullet and powder just with different charges. The pics are out of order but it is easy to see the increased charges and velocities. [ATTACH type="full" alt="20170910_213335.jpg"]73307[/ATTACH][ATTACH type="full" alt="20170910_213405.jpg"]73312[/ATTACH] [/QUOTE]
Verification
Post reply
Forums
Tennessee Gun Owners Forums
Reloading
Why are velocity nodes so important?
Top