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
New 150 matrix test
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="elkaholic" data-source="post: 957269" data-attributes="member: 13833"><p>Here is the latest update, but I would like someone to check my math. The b.c. #'s are pretty high. </p><p>Here is the scoop:</p><p>I zeroed the rifle dead on at 100 yards with a 3160 mv. I then went over to my friends where I could shoot at distance (885 yards) I stood a 14' 2x6 straight up and attached a 4x4 piece of cardboard at the bottom where I thought the bullets would hit. I then backed off to the 885 yard distance and fired 3 rounds prone using my bipod and a sandbag. I was a little leary that the rounds might hit near the bottom of the carboard, so used my 2 moa hashmark on the SIII to gain a little more elevation. I aimed flush with the 2x4 top. The wind was variable at approx 10 mph, but blowing from about 11:00 most of the time. Temp was 53 degrees and pressure was 13.50 PSI measured on my Leica 1600, which I later converted on JBM to 27.48 Hg. I fired 3 rounds and went back to the target. The group measured 8" wide by 2" high so I felt pretty good about the drop measurements. The width was probably due to the wind, or maybe the shooter<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> The avg. drop measured 135.3" from the top of the 2x4. I added 18.4" for 2 moa at 885 yards, for a total drop of 153.7". I then punched the #'s using JBM and came up with a G1 of .680 and a G7 of .337. WOW! This is very close to what the 160 gr. Matrix is. When I spoke with Marshal (Matrix) he said the difference in b.c. between the 270's he checked with a 10 grain difference in weight and using the same 2 jackets was very little. The 150 would have some advantage over the 160 because the 150 is a thinner jacket giving a higher sd, thus a higher b.c. all else equal. I have run these tests before and have come out VERY close to the two chrono method. Having said that, I would really like some of you to check my math. The older I get, the more mistakes I make (at least of this kind)<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />.......Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 957269, member: 13833"] Here is the latest update, but I would like someone to check my math. The b.c. #'s are pretty high. Here is the scoop: I zeroed the rifle dead on at 100 yards with a 3160 mv. I then went over to my friends where I could shoot at distance (885 yards) I stood a 14' 2x6 straight up and attached a 4x4 piece of cardboard at the bottom where I thought the bullets would hit. I then backed off to the 885 yard distance and fired 3 rounds prone using my bipod and a sandbag. I was a little leary that the rounds might hit near the bottom of the carboard, so used my 2 moa hashmark on the SIII to gain a little more elevation. I aimed flush with the 2x4 top. The wind was variable at approx 10 mph, but blowing from about 11:00 most of the time. Temp was 53 degrees and pressure was 13.50 PSI measured on my Leica 1600, which I later converted on JBM to 27.48 Hg. I fired 3 rounds and went back to the target. The group measured 8" wide by 2" high so I felt pretty good about the drop measurements. The width was probably due to the wind, or maybe the shooter:D The avg. drop measured 135.3" from the top of the 2x4. I added 18.4" for 2 moa at 885 yards, for a total drop of 153.7". I then punched the #'s using JBM and came up with a G1 of .680 and a G7 of .337. WOW! This is very close to what the 160 gr. Matrix is. When I spoke with Marshal (Matrix) he said the difference in b.c. between the 270's he checked with a 10 grain difference in weight and using the same 2 jackets was very little. The 150 would have some advantage over the 160 because the 150 is a thinner jacket giving a higher sd, thus a higher b.c. all else equal. I have run these tests before and have come out VERY close to the two chrono method. Having said that, I would really like some of you to check my math. The older I get, the more mistakes I make (at least of this kind):D.......Rich [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New 150 matrix test
Top