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
7mm RM Recipe for Muley Hunt
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="Bang4theBuck" data-source="post: 1812543" data-attributes="member: 73596"><p>I am the original poster that requested help on this cartridge. Here is my update so far, as promised. If you are one that doesn't like long-winded posts, I'll through you a bone. I've got 143 grain Hammer Hunters going almost 3300 FPS, with good accuracy, and good ESs. For those that want more detail....read on. </p><p>I placed an order for 50 hammer hunters. These are pretty pricy, so I didn't want to own too many if my rifle wasn't going to like them. That is turning out to me a mistake. My approach was to be very methodical on how I do this load development, without burning through too much powder, or too many bullets. So, I started with a modified ladder test, of single rounds of individual charge weights. I did this looking for velocity and pressure signs, to know what range I was going to develop loads in. I am using Gunwerks Brass and Fed GMM215M primers and RL26 Powder. My velocity and pressure tests told me that I needed to develop between 71 and 72.2 grains. Again, to conserve components, I loaded 4 shot groups at 71, 71.3, 71.6, 71.9 and 72.2. Those results are as follows:</p><p></p><p>71 Gr. AVG 3206 ES 29 SD 13.2 Group size .570"</p><p>71.3 GR AVG 3239 ES 26 SD 13.4 Group Size ~ 1.5"</p><p>71.6 GR AVG 3287 ES 58 SD 24.9 Group Size ~ 1"</p><p>71.9 GR AVG 3298 ES 13 SD 6.7 Group Size .650"</p><p>72.2 GR AVG 3329 ES 43 SD 19.9 Group Size ~1"</p><p></p><p>In all but one group (71.9), I had a single shot that varied widely from the rest of the shots as far as velocity. I am writing this off as the brass being fire formed in my chamber. Next steps for me are: Volume sort the cases and only use cases with consistent volume, and load up 4 shot groups at 71.8, 71.9, 72, and see if the node is flat enough and results can be replicated. I will do 3 shot groups this time to conserve, components for a last round of seating depth testing with best charge. Here are some pictures of the results. Note that the first and last groups both have 4 shots, but in the first group (71 gr), I had to move my site in, significantly, so I wrote in where the impact would have been in the group. In the last group (72.2 gr) I did not see the first shot, initially (12x scope) as it was hidden in sharpie numbers. I though I missed the paper, high, so I simply held one dot down on the target. in this case, I also wrote in where the impact was, relative to the rest of the group. Please comment. [ATTACH=full]170477[/ATTACH]</p></blockquote><p></p>
[QUOTE="Bang4theBuck, post: 1812543, member: 73596"] I am the original poster that requested help on this cartridge. Here is my update so far, as promised. If you are one that doesn't like long-winded posts, I'll through you a bone. I've got 143 grain Hammer Hunters going almost 3300 FPS, with good accuracy, and good ESs. For those that want more detail....read on. I placed an order for 50 hammer hunters. These are pretty pricy, so I didn't want to own too many if my rifle wasn't going to like them. That is turning out to me a mistake. My approach was to be very methodical on how I do this load development, without burning through too much powder, or too many bullets. So, I started with a modified ladder test, of single rounds of individual charge weights. I did this looking for velocity and pressure signs, to know what range I was going to develop loads in. I am using Gunwerks Brass and Fed GMM215M primers and RL26 Powder. My velocity and pressure tests told me that I needed to develop between 71 and 72.2 grains. Again, to conserve components, I loaded 4 shot groups at 71, 71.3, 71.6, 71.9 and 72.2. Those results are as follows: 71 Gr. AVG 3206 ES 29 SD 13.2 Group size .570" 71.3 GR AVG 3239 ES 26 SD 13.4 Group Size ~ 1.5" 71.6 GR AVG 3287 ES 58 SD 24.9 Group Size ~ 1" 71.9 GR AVG 3298 ES 13 SD 6.7 Group Size .650" 72.2 GR AVG 3329 ES 43 SD 19.9 Group Size ~1" In all but one group (71.9), I had a single shot that varied widely from the rest of the shots as far as velocity. I am writing this off as the brass being fire formed in my chamber. Next steps for me are: Volume sort the cases and only use cases with consistent volume, and load up 4 shot groups at 71.8, 71.9, 72, and see if the node is flat enough and results can be replicated. I will do 3 shot groups this time to conserve, components for a last round of seating depth testing with best charge. Here are some pictures of the results. Note that the first and last groups both have 4 shots, but in the first group (71 gr), I had to move my site in, significantly, so I wrote in where the impact would have been in the group. In the last group (72.2 gr) I did not see the first shot, initially (12x scope) as it was hidden in sharpie numbers. I though I missed the paper, high, so I simply held one dot down on the target. in this case, I also wrote in where the impact was, relative to the rest of the group. Please comment. [ATTACH=full]170477[/ATTACH] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm RM Recipe for Muley Hunt
Top