Couldn't say what's too small. I'm just reporting what happened. I went back to the thirtys and never looked back.
Because a 140-150gr 7mm (.284) just can't match a 150-165-180gr (.308)..... since a 140gr at 2800 and a 150gr at 2800 aren't ballistically comparable at all.
"since a 140gr. at 2,800 and a 150gr at 2,800 aren't ballistically comparable at all" Actually the 7mm outclasses the 30 in that comparison, though not by much.
When it comes to Sectional Density: 30 cal 150 is .226
7mm cal. 140 is .248
Therefore with bullets of the same const. the 7mm 140 will EASILY outpenetrate the 150 30 cal.
When it comes to BC: 30 cal. 150 BT or Accubond: .435
7mm cal. 140 BT or Accubond:.485
This BC diff will be close in other brands as well. With these bullets the diff. is very small, only an inch or 2 at 400 yards with the diff. growing as range increase which is important to target shooters, but the diff. is more with wind drift, which is
FAR more important. I mention this because of the ballistics comment.
Actually, the 165gr. in 30 cal. compares more with the 140 in 7mm, in BC & SD, but the 308 case will drive the 140
7-08 faster than a 165gr 308, but not by much. So the 7-08 is slightly better at long range & the 260 is slightly better yet because of the modest 308 case & high BC 6.5 bullets.
And BTW guys, I am a 308 fan & 30 cal in general for other reasons, but numbers are numbers. In fact I am about to go outside and "crony" 2 308 rifles. I am off topic here to address a little misinformation. To say the 7-08 is not a great Deer round is silly & indicates lack of experience in my view as is the 140 vs 150 stuff & as a moderator I would like to keep it straight. In fact it is one of the best pure Deer rounds going & anyone who can't tag Deer at normal ranges with that round has other issues to address. But for the second time, let's stay on topic. I will post the original post again.