8mm-06 Versus .338-06 A-Square
Q: Re: the 8mm-06 RCBS. I read your reply to someone a while ago where you said it was about 100-200fps faster than the 8mm-06 and was close to the 8mm Rem. Mag. If that is true, how does it rate against the .338-06 A-Square? Is it a barrel burner? Another query: 8x57 Vs .308 Win. Would they be on a par using the same weight bullets - 150-180 grains? How would their trajectories compare? The .300 Win. Mag is a sniper round par excellence. even the Russians use it. But is it as good as an article I read where a New Zealand bloke shot a tahr at almost 900 yards. He may have been a mercenary sniper as he claimed and knows his stuff, but is the cartidge as good as he says it is? Or just "Ho Hum" yawn stuff as you recently wrote? The 6.5 Creedmoor has been adopted by the U.S Army as sniper round out to 600-800 yards. Why is a shortened .308 better than a full-length .308 when necked down to 6.5mm? I would have thought the 6.5x55mm with that long FMJ bullet would perform similarly if loaded up a bit using the same bullet as the Creedmoor? The 130gn bullet in the .270 Win. has always been "the one", but using my CZ after 20 years in storage, I reckon the 140gn bullet is a better performer. What do you think? You once wrote that most improved cartridges weren't worth the effort, but that the .30-06 Ackley was. Am I correct? You rated the Christensen Ridgeline Model 14 you tested prior to September 2018 in 6.5 Creedmoor as being good, average, but nothing special. How would you rate it really against current quality rifles available from Winchester, CZ, Sauer etc?
A: The 8mm-06 RCBS is about 100 fps faster than the standard 8mm-06 and the one I had fired the 150gn bullet at 3145 fps, the 175gn at 2970 and the 198gn at 2726fps. It is definitely not in the class of the 8mm Rem. Mag. The .338 A-Square drives a 200gn bullet at about 2700fps and the 250gn at 2530fps. Neither cartridge is hard on barrels. I don't see much difference between the .308 Win. and the 8x57mm Mauser in regard to power or trajectory. I am afraid I took that article you sent me with a bloody big grain of salt, as I found a good many anomalies in it. The 6.5 Creedmoor was designed for target shooting where ranges are known and is badly over-rated as a game cartridge,I much prefer the 6.5-284 Norma. I think the
6.5x55mm Swede properly loaded with a bullet such as the Nosler 142gn Long Range spitzer loaded to 2790fps would outperform it. I understand the .300 Win. Mag has been superseded by Hornady's new .300 PRC which was tested and selected by the U.S Dept. of Defense for its extended log range programme. As to which bullet weight is best in the .270 Win., I'll take the 130gn at 3160fps ahead of the 140gn, just as long as it is a Barnes TSX. There's been a lot of controversial stuff written about the .30-06 Ackley Improved, and although I liked the one I had, it is really not worthwhile.
I'd have to rate the Christensen rifle I tested in 2018 as being very accurate, but it is a rifle you have to like. the same applies to all the other rifles on the market today. They are all good and accurate which makes it a matter of personal preference which one you choose.