Re: 6.5L vs. 6.5C vs. .260?
When looking at problem in 6mm, I found that a 6mm Remington, with a one in 7 twist, and on a long action, trumped a 243 substantially on performance ( read velocity and accuracy)... Velocity equaled a 6mm/06.. with less powder...
so building a long range rifle, even though I owned several 260s and a couple of 6.5 x 55s, and was able to test rifles owned by friends in 6.5 x 284, 6.5/06, 6.5/06 AI, and even access to a 264 Win Mag( which I passed on)....
I ended up building a 6.5 on a 6mm Remington case equivalent... or a 257 Roberts being the same case....on a long action, and went with a 28 inch barrel.. it equaled or beat the 284 case and 06 cases with all bullet weights...
just like the 6mm Remington on a long action, and seating bullets to magazine length, the 6.5 version beat the others or equaled the larger cases, while using less powder...
and even tho I knew it.... the idea was not new at all...
sure I could of called it a 6.5 x 6mm Remington....or even a 6.5 x 257 Roberts...but instead I labeled the barrel, that real old name that it was known by when it was developed in the early 1890s.... the 6.5 x 57...
hard to believe a capable round as it was, that it preceded the old 30/30 Winchester...
it even was flatter shooting, requiring less elevation, to 700 yds, than a 300 Win Mag shooting 180 grain match bullets, when loaded with 140 grain Sierra Match Kings..and 120 grain match kings...
a couple of FBI sniper team members got to test my rifle next to there rifles one rainy day at our local rifle range...the reduction in recoil and being flatter shooting than their rifles had them writing down the specs on my rifle... and a cartridge they never heard of... much less being shocked to find the cartridge was as old as the 30/30...