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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.223 vs 5.56 Chambers - HUGE bullet jump?
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<blockquote data-quote="bookworm" data-source="post: 454318" data-attributes="member: 13840"><p>Kevin - I'm about 2/3 of the way through Zediker's book right now...very informative and entertaining read.</p><p> </p><p>I went out and shot today and got mixed results with various loads. I varied the charge from 24.5 to 26.0 grains of Varget (at half grain increments), and shot two separate sets of 3-round groups for each load. </p><p> </p><p>Overall I was a bit disapointed with most of the groups coming in at around 1.25 - 1.5" at 100 yds. The one exception was the 25.5 grain loads, which both grouped at just over 0.5"...so it gave me some hope to build on.</p><p> </p><p>One question I have for you: the loads above (26.0) and below (25.0) opened up significantly - to around 1.5". Since 0.5 grains is quite a bit this was not a huge surprise. I also loaded 3 rounds at 25.3 grains and I was surprised to see those throw a group also near the 1.5" range. Is it possible that 0.2 grain difference (25.5 to 25.3) could make a group open up from 0.5 to 1.5 inches? Seems to me it should not be that sensitive. </p><p> </p><p>Other possibility is that my two 25.5 groups had some luck involved. Interested in your thoughts.</p><p> </p><p>visigoth - thanks for the link. The 6mmbr site is a good one - I'm always amazed at the amount of good info on that site.</p></blockquote><p></p>
[QUOTE="bookworm, post: 454318, member: 13840"] Kevin - I'm about 2/3 of the way through Zediker's book right now...very informative and entertaining read. I went out and shot today and got mixed results with various loads. I varied the charge from 24.5 to 26.0 grains of Varget (at half grain increments), and shot two separate sets of 3-round groups for each load. Overall I was a bit disapointed with most of the groups coming in at around 1.25 - 1.5" at 100 yds. The one exception was the 25.5 grain loads, which both grouped at just over 0.5"...so it gave me some hope to build on. One question I have for you: the loads above (26.0) and below (25.0) opened up significantly - to around 1.5". Since 0.5 grains is quite a bit this was not a huge surprise. I also loaded 3 rounds at 25.3 grains and I was surprised to see those throw a group also near the 1.5" range. Is it possible that 0.2 grain difference (25.5 to 25.3) could make a group open up from 0.5 to 1.5 inches? Seems to me it should not be that sensitive. Other possibility is that my two 25.5 groups had some luck involved. Interested in your thoughts. visigoth - thanks for the link. The 6mmbr site is a good one - I'm always amazed at the amount of good info on that site. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.223 vs 5.56 Chambers - HUGE bullet jump?
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