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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fast and slow barrels (or is it chambers)?
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<blockquote data-quote="Dave King" data-source="post: 36494" data-attributes="member: 3"><p>LB</p><p></p><p> Factory loads, that's why it's an interesting puzzle for me. The "known" data for the M118LR is apparently based on 2600fps (24 inch military barrel). That's how this quandry sort of came about, how to quantify drops for tracer ammunition as compared to the "known" M118LR loads. My test rifle with a 24" barrel shows 2718fps but the rifles I'm testing for show 2600fps (M118LR). The tracers show 2833 in my rifle so can I provide useful data??? Now enter the NATO chamber rifle but 26" barrel, not 24 as desired. I can check the 26" NATO chamber rifle against the 24" match rifle with the M118LR but not the tracer (too short on ammo for unnecessary shooting). Anyway, I can somewhat believe that 2" more barrel with a NATO chamber rifle and "factory" ammo will produce the 36fps difference from the 2600 (24" guns) to the 26" I shoot. </p><p></p><p> It's all just a little diversion for me as well as a puzzle piece.</p><p></p><p> </p><p> Just as a note, the NATO ammunition chambers with varying degrees of difficulty in the match chamber... a little snug already (long probably).</p></blockquote><p></p>
[QUOTE="Dave King, post: 36494, member: 3"] LB Factory loads, that's why it's an interesting puzzle for me. The "known" data for the M118LR is apparently based on 2600fps (24 inch military barrel). That's how this quandry sort of came about, how to quantify drops for tracer ammunition as compared to the "known" M118LR loads. My test rifle with a 24" barrel shows 2718fps but the rifles I'm testing for show 2600fps (M118LR). The tracers show 2833 in my rifle so can I provide useful data??? Now enter the NATO chamber rifle but 26" barrel, not 24 as desired. I can check the 26" NATO chamber rifle against the 24" match rifle with the M118LR but not the tracer (too short on ammo for unnecessary shooting). Anyway, I can somewhat believe that 2" more barrel with a NATO chamber rifle and "factory" ammo will produce the 36fps difference from the 2600 (24" guns) to the 26" I shoot. It's all just a little diversion for me as well as a puzzle piece. Just as a note, the NATO ammunition chambers with varying degrees of difficulty in the match chamber... a little snug already (long probably). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fast and slow barrels (or is it chambers)?
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