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  1. J

    Is it worth keeping a 308 around?

    Haha yeah, I forgot that the second most divisive topic on here besides cartridge choice was truck brands, that’s another choice where it really seems to matter what you grew up with. I’ve liked every Ford and Chevy I’ve driven but I always felt that Cummins wasted good engines by wrapping them...
  2. J

    Is it worth keeping a 308 around?

    10-4, point taken.
  3. J

    Is it worth keeping a 308 around?

    Understood, but the same people who bitch about the .308 being outdated bitch about there even being a Tac class, somehow it offends their honor that “ancient” cartridges can still shoot well, they don’t want us around. I’m just making the point that you wouldn’t race a Ford raptor (.308)...
  4. J

    Is it worth keeping a 308 around?

    Dear God, we’re still hung up on the PKM. Yes, 800 vs. 1000 m is the max EFFECTIVE range while the max range I quoted is 3725 vs. 3800. Crabbyballface or whatever his name was declared that our designated marksmen, machine gunners and snipers werent capable of engaging PKM and DSHK crews who...
  5. J

    Is it worth keeping a 308 around?

    It’s probably closer to a 38-40 inch barrel to get the same energy usage from the same powder charge in a .243” bore, total work doesn’t quite scale linearly with barrel volume because there is an exponential factor within the isentropic expansion equation that’s why you see an 18% increase in...
  6. J

    Is it worth keeping a 308 around?

    You didn’t ask, but I got bored and ran some numbers on your question. I considered the firing event to be constant volume, both rifles have the same barrel length and same initial chamber pressure, I did use the correct case capacities for each cartridge since there was a small difference. I’m...
  7. J

    Barrel Burn Out issues

    You talk about tires but really what you mean is that a car that sat for 40 years won’t run because a squirrel ate through the air filter and made a nest in cylinder number 7. Squirrels are incompressible and don’t mix well with air and fuel, everyone knows this. What were we talking about again?
  8. J

    Is it worth keeping a 308 around?

    I think what you’re asking is if the 7-08 will equal out with a .308 due to a higher pressure at the end of the barrel but there are other factors at play, and all other factors equal, unless the propellant is still burning, higher muzzle pressures and temperatures for the same charge weight...
  9. J

    Is it worth keeping a 308 around?

    I don’t think anyone achieved it or will, ended up under 2800 running very hot powders. Stated 162 gr. A-max to 2950 with 41.5 gr. of 8208 XBR but never saw any chronograph data. The problem with 7 creed is the same problem with .30 TC, It’s a cool round produced 49 years too late so it fits a...
  10. J

    Is it worth keeping a 308 around?

    I am also bored so sorry for posting a lot today. The argument was that 7cm takes advantage of the creedmoor small primer brass taking higher pressure but 7 cm was never saami rated, just a wildcat, so they may have been cranking pressure and not known or cared. I never saw any mention of case...
  11. J

    Is it worth keeping a 308 around?

    It’s a function of area at the base of the bullet .30 cal=.0745 iin^2 ;7mm=.284=.0633 in^2. So with the same case capacity and same powder you get roughly the same pressure,force =P*A so more surface area= more force. Acceleration =force/mass so for two bullets with equal mass (same weight) the...
  12. J

    Is it worth keeping a 308 around?

    The Wikipedia page for the PKM shows a longer maximum range than the 240, by 75 meters( woohoo), it also doesnt say what gas setting was used on the 240 Or what loads are used in each. Looking at the cartridges It’s very close in performance but the .308 has a small advantage in drop at...
  13. J

    Is it worth keeping a 308 around?

    My thoughts too, there was a solid 3 pages of back and forth about it on here with all the usual “data” and never a picture of a chronograph display/printout to back it up. You know how it goes. With a small primer, thick case head, and hot powders it’s possible, doesn’t mean it’s smart. That...
  14. J

    Is it worth keeping a 308 around?

    [ Around 2012 there was a good bit of discussion about 7mm GPC/7 creedmoor/ 7SAC. Pretty much 6.5 CM brass necked up to 7 mm, supposedly would push 175s to around 2900 FPS with a 24” barrel and could run them out of a short action at mag length. never really caught on, but seemed like the...
  15. J

    Is it worth keeping a 308 around?

    Obviously a .30-30 is for fudds, real operators use 7-30 Waters. spoiler alert; I’m kidding.
  16. J

    Is it worth keeping a 308 around?

    WARNING: The following is an opinion written by an asshole on the internet with no credentials, data and facts will not necessarily be present. I think the 6.5 creedmoor is a great round that has excellent ballistic performance on targets at slightly extended ranges when compared to a .308...
  17. J

    Rifle Scopes Eyeglasses for shooters??

    You might call your eye Dr. and see if you can bring a rifle in so they can evaluate what you need. Obviously unloaded and mention that you would be willing to come in at the very beginning or end of the day and work with them in keeping customers unaware of what’s going on. I have a lot of...
  18. J

    Gain twist...is it better for pressure or precision?

    Anybody have any comparative data between gain twist and non gain twist barrels regarding life before seriously degraded accuracy or maybe rate of throat erosion? I’m wondering if you guys who have shot out a few of each have found that you have to start chasing OAL sooner with a constant twist...
  19. J

    If you believe another shoe will drop

    Doesn’t Biden touch everyone?
  20. J

    Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

    Haha yeah, only the cool kids heard, but any firearm or cartridge designed before 2007 is basically a paperweight And if you own one you’re NOT OAF. Almost as bad as showing up to the range wearing Carhartts and Ariats instead of the proper gucciflage and nylons. Oh well, I still like my old...
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