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<blockquote data-quote="Spotter&amp;#039;s Signature" data-source="post: 2977170" data-attributes="member: 121865">Just to clarify, I&#039;m fully aware of the &quot;drop the weight, gain velocity&quot; mantra regarding the copper monos. I used to shoot 160 gr - 175 gr lead/copper bullets (too many to list here, haha...) in this rifle. So, I stepped down to 150 gr in copper. The suggestion to switch to 140 gr TTSX is not valid. After doing some math, I discovered that the 140 gr TTSX would fly about 150 fps faster (liberal assumption) in my rifle and would offer negligibly better performance within the first 200 yards (based on energy). After that its velocity is almost identical to the 150 gr TTSX, to eventually match its velocity at 700 yds, with less energy. Past the first 200 yards, 140 gr TTSX offers no meaningful advantage IMO, so it doesn&#039;t warrant load development cost, time and efforts (and barrel life).Here&#039;s the ballistics of the 140 gr TTSX, leaving the muzzle ~150 fps faster than my 150 gr TTSX:[ATTACH]522362[/ATTACH]I&#039;ve seen on this forum a hunter claiming shots with these copper bullets from a 7mm RM (!) on an elk at ~1100 yds! Supposedly, with no issues with its lethality, whatsoever. But, it&#039;s internet <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool&nbsp; &nbsp; :cool:" loading="lazy" data-shortname=":cool:" />To me, for now, 800 yds is the ethical limit. Most bullets take about a second to travel that, and a single second is a lot of time for an animal to move, excellent ballistics be damned...</blockquote>

[QUOTE="Spotter's Signature, post: 2977170, member: 121865"] Just to clarify, I'm fully aware of the "drop the weight, gain velocity" mantra regarding the copper monos. I used to shoot 160 gr - 175 gr lead/copper bullets (too many to list here, haha...) in this rifle. So, I stepped down to 150 gr in copper. The suggestion to switch to 140 gr TTSX is not valid. After doing some math, I discovered that the 140 gr TTSX would fly about 150 fps faster (liberal assumption) in my rifle and would offer negligibly better performance within the first 200 yards (based on energy). After that its velocity is almost identical to the 150 gr TTSX, to eventually match its velocity at 700 yds, with less energy. Past the first 200 yards, 140 gr TTSX offers no meaningful advantage IMO, so it doesn't warrant load development cost, time and efforts (and barrel life). Here's the ballistics of the 140 gr TTSX, leaving the muzzle ~150 fps faster than my 150 gr TTSX: [ATTACH]522362[/ATTACH] I've seen on this forum a hunter claiming shots with these copper bullets from a 7mm RM (!) on an elk at ~1100 yds! Supposedly, with no issues with its lethality, whatsoever. But, it's internet :cool: To me, for now, 800 yds is the ethical limit. Most bullets take about a second to travel that, and a single second is a lot of time for an animal to move, excellent ballistics be damned... [/QUOTE]

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