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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Badlands Precision Bullets thread - From BC to terminal ballistics
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<blockquote data-quote="264MHC" data-source="post: 2686361" data-attributes="member: 111161"><p>So I'd say a typical Grendel AR with 24" Barrel will shoot a 123 ELDM .260 G7 at 2600 fps. My 18" Grendel shot these at 2460, and 16" at 2400. My current Grendel is 12.7" and gets 2300 with these. I was able to get 2550 with 107 TMK g7 .240 in my 16", almost achieving the 24" barrel benchmark above. In the 12.7, I am currently working with 97 Absolute Hammers but the best I have done so far is 2640, but the g7 is only .166. I could probably mess with different powders and get them faster, but I feel like that is a good representation of velocity in this barrel length with 100ish grain bullets. </p><p></p><p>If I could get that same velocity with a similar weight bullet, but with a g7 in the .250 range, it would essentially match 123 factory ammo in a 24" barrel, at almost half the barrel length. Energy of course would be lower, but velocity, drop and drift would match up well. </p><p></p><p>The 107 TMK is the closest to ideal I have found but I'm out of them and they haven't done a run of them in quite awhile. </p><p></p><p>With what you've been able to do with the 125 and 135 (s)bd2, It seems possible a 100 grain or lighter bullet could get to .250 g7 if designed around max performance in an 8 twist. Most lighter 6.5 bullets work in 9 or slower twist so leave performance on the table in an 8.</p></blockquote><p></p>
[QUOTE="264MHC, post: 2686361, member: 111161"] So I’d say a typical Grendel AR with 24” Barrel will shoot a 123 ELDM .260 G7 at 2600 fps. My 18” Grendel shot these at 2460, and 16” at 2400. My current Grendel is 12.7” and gets 2300 with these. I was able to get 2550 with 107 TMK g7 .240 in my 16”, almost achieving the 24” barrel benchmark above. In the 12.7, I am currently working with 97 Absolute Hammers but the best I have done so far is 2640, but the g7 is only .166. I could probably mess with different powders and get them faster, but I feel like that is a good representation of velocity in this barrel length with 100ish grain bullets. If I could get that same velocity with a similar weight bullet, but with a g7 in the .250 range, it would essentially match 123 factory ammo in a 24” barrel, at almost half the barrel length. Energy of course would be lower, but velocity, drop and drift would match up well. The 107 TMK is the closest to ideal I have found but I’m out of them and they haven’t done a run of them in quite awhile. With what you’ve been able to do with the 125 and 135 (s)bd2, It seems possible a 100 grain or lighter bullet could get to .250 g7 if designed around max performance in an 8 twist. Most lighter 6.5 bullets work in 9 or slower twist so leave performance on the table in an 8. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Badlands Precision Bullets thread - From BC to terminal ballistics
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