12-27-2011, 07:03 PM
LR1955 Wrote:Bjorn:
The short answer is yes. The reason is basically one of powder column. Shorter, fatter cartridges tend to burn the powder more evenly. Also, less recoil generally correlates with more consistency.
LR55
Spot on,
just discussed with Boots Obermeyer doing a barrel for a "Across the Course" in the 6.5mm bore we discussed twist rate which he surprised me with recommending the 1-8.75 twist for the 142 gr Sierria I figured the 1-8 would be the ticket. We shifted the conversation to cases the .308 length vs the .284 vs the 06 cases for the 6.5 bore. He flattly recommended the .260 Rem echoing LR55 to a tee on the column stack which I had heard before from others in the know. Thus basically endorsing JA Smith and LRRPF52 comments on caliber choice of .260 Remington. During the conversation he discounted the .284 as a barrel burner with the 6.5-06 being a close second with the added attribute of too long a linear charge to negatively affect accuracy. While my discussion was about across the course the same holds true for your Mountain rifle. Neither one of us brought up barrel length within this bore as that would be a subjective thing looking at 20 to 28" the loss of velocity is not much as JASmith has pointed out. Do I have faith in the 30-06 and .308 to get the job done? .. yes I would be happy to use either. I have a Old Remington 721 in 30-06 that shoots like a house on fire provided I feed it the correct load and will almost hang with the Remington 700 PSS in .308 that I used to own (maybe a .100" Differance going to the PSS).
Could the .260 do the same job with a edge/advantage? I believe so, and appearantly the Gentleman from WI seems to think the best choice in the 6.5mm bore is the .260 Rem, as he stated he would use that caliber for Hunting or competion. Hope this helps