Results 1 to 11 of 11

Thread: 300 grain 10mm?

  1. #1
    Abr
    Abr is offline Junior Member
    Join Date
    May 2011
    Posts
    10

    Question 300 grain 10mm?

    I'm relatively new to glock, but I'm wondering if they'll survive firing 300 grain fmj projectiles from a 10mm auto cartridge. The 300 grain round is a less common round used because it's less sensitive to wind, which is useful for outdoor conditions.

    The only thing I've heard about glock is that they tend to explode if loaded with exposed lead rounds due to the rifling, but I have not heard anything about heavy rounds.

    I'm guessing I'd need a stronger recoil spring, but would that be enough and is that even available?

    Note: google and search function didn't generate any answers.

  2. Ads
  3. #2
    DJ Niner's Avatar
    DJ Niner is offline HGF Forum Moderator
    Join Date
    Oct 2006
    Location
    North-Central USA
    Posts
    4,274
    I've never heard of a 300 grain bullet or load in 10mm caliber; the heaviest I've heard of was a 230 grain bullet. Based on my experience and a little research, I don't think it's possible to safely load a 300 grain jacketed bullet in this caliber to any decent/useful velocity. Even if a safe load powder charge could be found to drive such a heavy bullet, the bullet itself would have to be specially designed with a tapered base to prevent the case from bulging when the case web begins to thicken, which would cause difficulties in chambering.

    For an idea of some of the variables involved in making/loading such a heavy bullet, I'd recommend reviewing this discussion thread over at Glock Talk:

    anyone intrested in heavy 10mm bullets, read this and give me some input. - Glock Talk
    "Placement is power" -- seen in an article by Stephen A. Camp
    (RIP, Mr. Camp; you will be remembered, and missed)

  4. #3
    Abr
    Abr is offline Junior Member
    Join Date
    May 2011
    Posts
    10
    Very interesting reading, thanks for the input.

  5. #4
    HK Dan is offline Member
    Join Date
    Dec 2010
    Posts
    253
    Well, a 300 grain bullet would be awfully long (since it can't be bigger around). That puts the base a lot farther into the case, which ups the pressure quite a bit. Now, I hadn't heard of a 230 grain 10mm bullet before. The largest I'm aware of is a 200 grainer. You would definately be on the cutting edgewith that load. Of course, most folks on that cutting edge get cut, so be careful. <g>

  6. #5
    DJ Niner's Avatar
    DJ Niner is offline HGF Forum Moderator
    Join Date
    Oct 2006
    Location
    North-Central USA
    Posts
    4,274
    Don't feel left out; until I did some research for this thread, I hadn't heard of a 10mm 230 grain load either.
    It must be real, though, because MidwayUSA is selling it in two different flavors:

    JHP:
    DoubleTap Ammunition 10mm Auto 230 Grain Equalizer Jacketed Hollow Point Box of 50 - MidwayUSA

    Gas-checked lead WFN:
    DoubleTap Ammunition 10mm Auto 230 Grain Lead Wide Flat Nose Gas Check Box of 50 - MidwayUSA
    "Placement is power" -- seen in an article by Stephen A. Camp
    (RIP, Mr. Camp; you will be remembered, and missed)

  7. #6
    HK Dan is offline Member
    Join Date
    Dec 2010
    Posts
    253
    Wow DJ--Thanks!I didn't know they existed and was ready to throw the BS towel in on this one. That's gotta be a long bullet. The 200 grain scares me a little.

  8. #7
    Texcowboy's Avatar
    Texcowboy is offline Junior Member
    Join Date
    Dec 2010
    Location
    Fort Worth, Texas
    Posts
    30
    As far as Glocks "exploding" with unjacketed lead rounds, Glocks rifiling is such that lead builds up in the grooves. You can buy an aftermarket barrel from LoneWolf or one of the other brands and shoot lead rounds with no problem. I think I will keep the 180 gr as my top load with my G20. It should handle a Zombie attack just fine.

  9. #8
    HK Dan is offline Member
    Join Date
    Dec 2010
    Posts
    253
    That's the popular myth Tex. If ya read Chapter 4 of "The GLOCK in Competition" he does an outstanding analasys of the issue. It's not the polygonal rifling that causes the problem!

  10. #9
    Abr
    Abr is offline Junior Member
    Join Date
    May 2011
    Posts
    10
    I apologize for my late reply. Thank you DJ Niner!

    The why: I'm looking for a heavy projectile that goes subsonic but still uses all the potential of the 10 mm auto cartridge. For example (I've heard the following, no verified sources, take it as an anecdote) the 10 mm got a lot of negative publicity when a US agency decided on a 180-grain subsonic round. This because that preformance can be achieved with the shorter .40 S&W, which is more forgiving for the users with smaller hands. I have really big hands and I love big grips, that's why I'm looking at 10mm as an alternative.

    Why not .45?
    I prefer the larger magazine capacity of the 9mm and 10mm. Personal preference, nothing more.

    Why heavy?
    I want a cartridge which is loaded to the highest pressure allowed, still yielding a subsonic projectile. The 230-grain is right in the transonic range, but I want some margin. On glock-talk they suggested that a 260 grain projectile was optimal for this purpose. Still haven't found a good mould, if you know of one please do tell.

  11. #10
    Abr
    Abr is offline Junior Member
    Join Date
    May 2011
    Posts
    10
    Quote Originally Posted by HK Dan View Post
    That's the popular myth Tex. If ya read Chapter 4 of "The GLOCK in Competition" he does an outstanding analasys of the issue. It's not the polygonal rifling that causes the problem!
    That's really interesting, what is the cause then?
    And do you know how to fix it?

  12. #11
    WilliamDahl's Avatar
    WilliamDahl is offline Junior Member
    Join Date
    Feb 2014
    Location
    TX Gulf Coast
    Posts
    19
    I have never shot anything other than cast lead bullets in any of my Glocks.

Ads

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Search tags for this page

10 mm grain
,
10mm 230 grain
,
10mm 230 grain ammo
,
10mm ammo 300 grain
,
10mm grain
,
10mm largest grain
,

230 grain 10mm

,
230 grain 10mm bullets
,
300 gr 10mm
,
300 grain 10mm
,
heaviest 10mm bullet
,
highest grain 10mm
Click on a term to search for related topics.