Bob Nelson 35Whelen
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@Bill J HThe 25-06 vs the 6.5 CM. Interesting. Interesting enough that I did a ballistic comparison.
I just reviewed the Nosler "published" load data and bounced that information off my ballistic calculator. Of course, we know that, as handloaders, can push the bullets faster than published data, but since we can do it for both cartridges, I just went with the published data.
I used the Partition, since it is the heaviest 25-06 offering and you could get a Partition bullet in 6.5. At least this keeps the bullets the same...
The 25-06 pushed the 120gr PT at around 3000fps, unless your rifle liked Retumbo. Retumbo kind of stood out as an outlier from the other powders.
The 6.5CM pushed a 140gr PT at 2700; there were several powders that did this but there was no "hot-rod" outlier like Retumbo.
The result at 200yds:
25-06: 1 MOA windage / 1708 ft-lbs
6.5CM: 1 MOA windage / 1711 ft-lbs
At 300yds:
25-06: 2.2 MOA Drop; 4.2 MOA windage / 1423 ft-lbs
6.5CM: 2.6 MOA Drop; 3.9 MOA windage / 1472 ft-lbs
Interestingly, Nosler also makes a 6.5mm 150gr ABLR that can be pushed at 2690ish. I don't have the ballistic calculations for that, but it would push the CM substantially higher.
Watch Ron Spomers video on the 25-06 versus the 6.5 creede. Very interesting.
Bob