IMR-8208 XBR

This is a discussion on IMR-8208 XBR within the Product Review Requests forums, part of the SniperForums.com & SniperCentral.com Related category; Has anyone here done any testing of this powder in the .308 wcf yet with 168 and 175 grain SMK's? Is this powder available in ...

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Thread: IMR-8208 XBR

  1. #1
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    IMR-8208 XBR

    Has anyone here done any testing of this powder in the .308 wcf yet with 168 and 175 grain SMK's? Is this powder available in your area yet. I haven't seen any in southern California yet.

    Sincerely,
    Dave (Bubba) Thornblom

  2. #2
    Member Skg_Mre_Lght's Avatar
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    Re: IMR-8208 XBR

    Quote Originally Posted by thornblom
    Has anyone here done any testing of this powder in the .308 wcf yet with 168 and 175 grain SMK's? Is this powder available in your area yet. I haven't seen any in southern California yet.

    Sincerely,
    Dave (Bubba) Thornblom
    This is actually a re-release of an old powder, that was coveted by benchrest guys. It should work pretty good with .308 sized cases, and I have dabbled with it, somewhat, in my .220 Swifts.

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    Senior Member Stormrider's Avatar
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    I've got some but haven't had a chance to try it out yet...

    ______________________
    NOBAMA

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    I have a 308 here that i'm working a match load using this powder, I'm using the 175smk


    So let me know what your looking for.


    Tom

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    Hey BigBoy,

    Finally, someone with a .308, IMR-8208 XBR and 175 SMKs all at the same time. Let me know what cases, primers and charge weight that you come up with and what your accuracy nodes are. Velocity wise, I am looking for something near the M118LR load at around 2650 to 2655 ft/sec. I loaded 175 SMKs in FC 08 cases factory primed with 43.1 grains of RL-15 and that works pretty darn good, but I was thinking IMR-8208 XBR would yeild greater accuracy and be less temp sensitive.

    Let me know what you come up with and I will keep looking for 8208 in my area.

    I think, but not positive, that IMR-8208 XBR is what Remington is using in their Premier Match ammo with the 175 SMKs. Quick had some great experiences with that ammo in Australia in a training seminar. They were shooting at 1219 yards and this ammo was the best of the several brands that they were using.

    Sincerely,
    Dave (Bubba) Thornblom

    PS: Hodgdon lists this info for IMR-8208 XBR in the .308 with 175 SMKs:

    39 grains at 2511 ft/sec and 52,200 psi
    42.5 grains at 2664 ft/sec and 61,800 psi

    So, 41.2 to 41.3 grains should get close to 2609 ft/sec that remington quotes.

    And, 42.3 grains should get very close to 2650 ft/sec that the m118LR load gets.

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    Quote Originally Posted by thornblom
    Hey BigBoy,

    Finally, someone with a .308, IMR-8208 XBR and 175 SMKs all at the same time. Let me know what cases, primers and charge weight that you come up with and your accuracy nodes. Velocity wise, I am looking for something near the M118LR load at around 2650 to 2655 ft/sec. I loaded 175 SMKs in FC 08 cases factory primed with 43.1 grains of RL-15 and that works pretty darn good, but I was thinking IMR-8208 XBR would yeild greater accuracy and be less temp sensitive.

    Let me know what you come up with and I will keep looking for 8208 in my area.

    I think, but not positive, that IMR-8208 XBR is what Remington is using in their Premier Match ammo with the 175 SMKs. Quick had some great experiences with that ammo in Australia in a training seminar. They were shooting at 1219 yards and this ammo was the best of several brands that they were using including FGMM. Remington list the velocity of this load as 2609 ft/sec.

    Sincerely,
    Dave (Bubba) Thornblom

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    Ok its going to be about aweek befor i can get the loads worked up and go shoot them


    Tom

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    Not a problem. I am a patient man. And I really do appreciate your time and input on this. Inquiring minds need to know, especially if they can't get the powder to experiment with.

    Sincerely,
    Dave (Bubba) Thornblom

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    My testing of M118LR velocities seem to differ from what is on here???

    Quote Originally Posted by thornblom View Post
    Hey BigBoy,

    Finally, someone with a .308, IMR-8208 XBR and 175 SMKs all at the same time. Let me know what cases, primers and charge weight that you come up with and what your accuracy nodes are. Velocity wise, I am looking for something near the M118LR load at around 2650 to 2655 ft/sec. I loaded 175 SMKs in FC 08 cases factory primed with 43.1 grains of RL-15 and that works pretty darn good, but I was thinking IMR-8208 XBR would yeild greater accuracy and be less temp sensitive.

    Let me know what you come up with and I will keep looking for 8208 in my area.

    I think, but not positive, that IMR-8208 XBR is what Remington is using in their Premier Match ammo with the 175 SMKs. Quick had some great experiences with that ammo in Australia in a training seminar. They were shooting at 1219 yards and this ammo was the best of the several brands that they were using.

    Sincerely,
    Dave (Bubba) Thornblom

    PS: Hodgdon lists this info for IMR-8208 XBR in the .308 with 175 SMKs:

    39 grains at 2511 ft/sec and 52,200 psi
    42.5 grains at 2664 ft/sec and 61,800 psi

    So, 41.2 to 41.3 grains should get close to 2609 ft/sec that remington quotes.

    And, 42.3 grains should get very close to 2650 ft/sec that the m118LR load gets.

    I tested 20 rounds of my M118LR ammunition in 68' F weather and consistenly got 2620 fps average. I had one rounds get up to 2633 and a second round up to 2635 fps. but most were in the 2620 fps range. This was standard Lake City M118LR (I ordered a bunch back in 2006). Anyway, I came up with this load with the IMR 8208:

    Lake City Brass
    Federal 210M Primers
    41.8 grains of IMR 8208 (2620 fps) (59,400 psi)
    175 Grain SMK seated @ 2.820"
    Neck sized with .337" bushing

    I know that the M118LR is the real deal but I am wondering because I keep seeing higher fps with everyone else's data. At any event, my load stays supersonic (1152.4 fps) out to 1100 yards at that is good enough for me.

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