Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
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
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer ballistic coefficient tests...
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="Petey308" data-source="post: 2613346" data-attributes="member: 106845"><p>I definitely agree with all of that and take away pretty much the same things.</p><p></p><p>If I may, I only want to offer some more considerations to this thread topic. I'm not implying anything and I'm not trying to pick a fight against anyone or any specific bullet.</p><p></p><p>Some things are extremely hard to model and calculate, such as drive bands, bore riders, amount of drive bands, rounded edges, open tips, size of open tips, exposed lead tips, etc, etc. Fir those things, you have to simply look at the drop data, radar data, etc and extrapolate it from that by comparing them all to see what makes a positive or negative effect on aerodynamics and BC.</p><p></p><p>I had a conversation not too long ago with Bryan Litz about drive bands, to include Hammer's drive band design, and if he'd ever tested the same things when they were designing the Berger Match Solids. Even with a patent, it won't stop you from at least doing tests to see the effects. Here was his main response in regards to it:</p><p>[ATTACH=full]392332[/ATTACH]</p><p></p><p>So from that conversation, and based on the data presented in this thread, I think it's safe to say that while the drive bands and rounded edges of the Hammers do indeed help achieve great MVs and reduce drag compared to if they didn't have the radiused edges, the amount of grooves used still lowers the overall aerodynamics and greatly increases parasitic drag. Thus, actual BC will be significantly lower than any estimate. The open tips compound this as well.</p><p></p><p>Again, I'm not trying to use this as some way of saying "Hammers are bad". I'm only offering it as data and talking points and as a contributing factor on the actual BCs seen by many with them and how they seem to consistently be lower than all the published estimates.</p><p></p><p>I do wish more bullet manufacturers would invest in such things as switch barrel action setups so they can cost effectively test many different bullets and in many different rifle twists and velocities, as well as inexpensive radar like LabRadar, teamed with software like the RSI Shooting Lab software, to be able to get much more accurate BCs for the consumer to start with. Even a LabRadar, or Magnetospeed, and a Kestrel with AB software and doing drop verifications like [USER=104268]@entoptics[/USER] has done here is effective as well as cost effective.</p><p></p><p>Just wanted to share those thoughts, as it's been eating away at me since the start of this thread. I'm not trying to stir any pot here, so please don't take my intentions the wrong way.</p><p></p><p>Here's a link to that RSI software too, if anyone was interested and wondering about it:</p><p></p><p>[URL unfurl="true"]https://www.shootingsoftware.com/ballistics.htm[/URL]</p></blockquote><p></p>
[QUOTE="Petey308, post: 2613346, member: 106845"] I definitely agree with all of that and take away pretty much the same things. If I may, I only want to offer some more considerations to this thread topic. I’m not implying anything and I’m not trying to pick a fight against anyone or any specific bullet. Some things are extremely hard to model and calculate, such as drive bands, bore riders, amount of drive bands, rounded edges, open tips, size of open tips, exposed lead tips, etc, etc. Fir those things, you have to simply look at the drop data, radar data, etc and extrapolate it from that by comparing them all to see what makes a positive or negative effect on aerodynamics and BC. I had a conversation not too long ago with Bryan Litz about drive bands, to include Hammer’s drive band design, and if he’d ever tested the same things when they were designing the Berger Match Solids. Even with a patent, it won’t stop you from at least doing tests to see the effects. Here was his main response in regards to it: [ATTACH type="full" alt="73AFE337-C0C2-4C2B-925A-E9F673D663D9.jpeg"]392332[/ATTACH] So from that conversation, and based on the data presented in this thread, I think it’s safe to say that while the drive bands and rounded edges of the Hammers do indeed help achieve great MVs and reduce drag compared to if they didn’t have the radiused edges, the amount of grooves used still lowers the overall aerodynamics and greatly increases parasitic drag. Thus, actual BC will be significantly lower than any estimate. The open tips compound this as well. Again, I’m not trying to use this as some way of saying “Hammers are bad”. I’m only offering it as data and talking points and as a contributing factor on the actual BCs seen by many with them and how they seem to consistently be lower than all the published estimates. I do wish more bullet manufacturers would invest in such things as switch barrel action setups so they can cost effectively test many different bullets and in many different rifle twists and velocities, as well as inexpensive radar like LabRadar, teamed with software like the RSI Shooting Lab software, to be able to get much more accurate BCs for the consumer to start with. Even a LabRadar, or Magnetospeed, and a Kestrel with AB software and doing drop verifications like [USER=104268]@entoptics[/USER] has done here is effective as well as cost effective. Just wanted to share those thoughts, as it’s been eating away at me since the start of this thread. I’m not trying to stir any pot here, so please don’t take my intentions the wrong way. Here’s a link to that RSI software too, if anyone was interested and wondering about it: [URL unfurl="true"]https://www.shootingsoftware.com/ballistics.htm[/URL] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer ballistic coefficient tests...
Top