.308 Reloading data only - Page 101

.308 Reloading data only

This is a discussion on .308 Reloading data only within the Reloading forums, part of the Sniping Related category; Originally Posted by straightshooter1 Picked up 500 175 gr Nosler Custom Competition bullets for a really good deal on a close out. I ran out ...

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  1. #1001
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by straightshooter1 View Post
    Picked up 500 175 gr Nosler Custom Competition bullets for a really good deal on a close out. I ran out os 175 SMK's, so I loaded up 50 of these using the same cartridge specs as above and they did almost identical results on paper. Don't know what MV I had, but I'd bet it's pretty close to the same too. Group were on target hitting the POA dots and grouping just under .5 MOA. I think with a little adjustment in seating depth, they can do a lot better (though I'm never to sure about the shooter at such an advanced age ).
    Well . . . am still getting good results with 42.5 gr of IMR 4064. So, yesterday I played with seating depth's for these 175 gr Nosler Custom Competition bullets running from .003 off the lands at .003 increments to .015 off. None of them did as well or any better than being .003 off. The 42.5 grs gave me a 5 round group of .372" (not quite as good as the SMK's gave me, but close). And with an average MV that I've measured with my MagnetoSpeed V3 of 2676 fps, I feel this is the 4064 load I'll be sticking with for whichever 175 gr bullet is load up.

    Since I have a jug of AR-Comp and ran a previous load that I developed for my old barrel, which was 39.6 grs set with the same specs, I tried it with this new barrel and got pretty good results (again) with it. 5 round group was at .263" and firing 10 rounds to get chrono numbers I got an ES of 26, an SD of 7.5. and the MV average was 2603 fps. These were loaded in full length sized Peterson brass. I tend to get better groupings with neck sized only brass than I do with FL, so I'm gong to see if that holds true with this load. I've been really liking this AR-Comp powder for my .308.

  2. #1002
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    Rem700 action. Shilen 26” barrel bedded in a Carlson medalist stock.
    My PRS load is:
    Winchester large primer brass (prove to me there’s a difference)
    CCI std primer
    46g (compressed) Vhit N150
    175g TMK
    2.810 OAL
    2760 FPS
    1.4” 3-shot group @ 200 yds

  3. #1003
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by Canine View Post
    Winchester large primer brass (prove to me there’s a difference)
    Am not sure just what you're suggesting with regards to "difference", but we do know by measuring Winchester brass thickness is one of the most thin and when one measures cases volume, it's capacity is greater than other brass. For example, the Winchester brass I have measures around .012 - .0125 in thickness while my Lapua measures .0145 - .015. This difference in thickness results in a larger case volume in Winchester brass (like 57.7 grs vs 55.56 for Lapua). So, those differences results in different ballistics using Lapua brass for the load above that you're using.

    Or . . . are you referring to a different kind of difference?

    Nice! You found a powder that is working well with the 175 TMK's. I had a hard time finding a load that worked with my TMK's, but eventually did and I found AR-Comp not only works well with the TMK's but also works well with the 175 SMK's
    Last edited by straightshooter1; 04-02-2019 at 08:11 PM.

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  5. #1004
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    Quote Originally Posted by straightshooter1 View Post
    Well . . . am still getting good results with 42.5 gr of IMR 4064. So, yesterday I played with seating depth's for these 175 gr Nosler Custom Competition bullets running from .003 off the lands at .003 increments to .015 off. None of them did as well or any better than being .003 off. The 42.5 grs gave me a 5 round group of .372" (not quite as good as the SMK's gave me, but close). And with an average MV that I've measured with my MagnetoSpeed V3 of 2676 fps, I feel this is the 4064 load I'll be sticking with for whichever 175 gr bullet is load up.

    Since I have a jug of AR-Comp and ran a previous load that I developed for my old barrel, which was 39.6 grs set with the same specs, I tried it with this new barrel and got pretty good results (again) with it. 5 round group was at .263" and firing 10 rounds to get chrono numbers I got an ES of 26, an SD of 7.5. and the MV average was 2603 fps. These were loaded in full length sized Peterson brass. I tend to get better groupings with neck sized only brass than I do with FL, so I'm gong to see if that holds true with this load. I've been really liking this AR-Comp powder for my .308.
    straightshooter1 Using 41.6 of ArComp with 175 RDF and 175 TMK coal is 2.935 in my Rem 700 Gen2 5R 2654 fps working real good and also my 223 Ruger with a 77gr TMK loves it also.
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  6. #1005
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by mike06 View Post
    straightshooter1 Using 41.6 of ArComp with 175 RDF and 175 TMK coal is 2.935 in my Rem 700 Gen2 5R 2654 fps working real good and also my 223 Ruger with a 77gr TMK loves it also.
    Hi Mike,

    Yeah, I used that load of 41.6 AR-Comp with the 175 TMK's in my factory RPR 20" barrel back in June of last year and it performed well. I didn't record the grouping measurement, but I was getting chrono readings with single digit SD's and ES's from 10 to 20. And MV averages were just under 2600 fps. My COAL for those TMK's was at 2.962 (.005 off the lands).

    A couple week ago, when I fired that 39.6 load, I also ran this 41.6 gr of AR-Comp using SMK's through this new 24" Krieger SS barrel. Again, the chrono numbers were good with 10 rounds giving me an SD of 7.1 and an ES of 23, but I only got a grouping of .645 MOA. For that MOA, I didn't have any calls to blame it on and I just assume it needs some adjustments for that particular node. Average MV was 2724 fps with a COAL at 2.863 and .003 off the lands, which I feel that velocity might be a little out of the upper accuracy node on the high side. I might try some more testing to see what I might get using neck sized only brass instead of FL sized and use my Lapua or Federal brass. And, since I still have some TMK's left, I just might load a few of them up and see how they do too. Oh, and the temperature was 20 degrees cooler this year than when I used the AR-Comp last year. So . . . ???
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  7. #1006
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by mike06 View Post
    straightshooter1 Using 41.6 of ArComp with 175 RDF and 175 TMK coal is 2.935 in my Rem 700 Gen2 5R 2654 fps working real good and also my 223 Ruger with a 77gr TMK loves it also.
    mike06, well . . . my Krieger barrel didn't like this load for the TMK's. I loaded up 10 rounds and of the two 5 round groups, the best one was .841 MOA. SD was 8.7 and ES of 19 with an average MV of 2699 fps. While the chrono numbers are pretty good, the velocity is on the high side of the node as this barrel seems to have a good accuracy node around 2675 fps. Using exactly the same load, same distance off the lands using 175 SMK's I got a nice group of .331 MOA with SD at 6.3, ES of 19 and an average MV of 2688 fps. Typically, I don't get that good of group with a velocity that high. But that was nice to see, as it was much better than that load did before with the SMK's. . . though there was a difference in seating depth from before where it was .007 off the lands and got an average MV of 2724. Today's loads were at the lands (almost touching or barely touching sometimes).

    I had 4 cartridges of Lapua brass loaded with 175 NCC's that I couldn't chamber from last week as the necks needed to be bumped back a little. So I bumped the loaded cartridges back .002 and they chambered just fine. I wasn't sure how well they would do as I've never bumped the necks of live rounds before. So I used them to start the day off today. Those 4 rounds gave me my best group ever at .136 MOA at 100 yds. These cartridges were loaded with 39.6 gr AR-Comp and very close to the lands (COAL = 2.894). And my MV for this load is around 2563 fps. I've liked 175 SMK's best and the only reason I'm using the NCC's is that I got a great deal on a close out, so I pick up 500 of 175's and 250 168's. If I can consistently get good performance like that with them, they'll become my favorite.
    Last edited by straightshooter1; 04-05-2019 at 06:52 PM.
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  8. #1007
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    Straightshooter before you give up on the TMK try letting them jump .050 or .075 one time. My 175 RDF's like to jump not uncommon for me to jump them .100 in these over throated factory Rem 700. As far as bumping the shoulder on a loaded round I do it all the time. I even had to bump some off the shelf Hornady Win 270 for two of my friends. One has a new Rem 700 270 the other was a Tika T3 270. Those rounds had a + .003 head space right out of the box.

  9. #1008
    Senior Member straightshooter1's Avatar
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    Quote Originally Posted by mike06 View Post
    Straightshooter before you give up on the TMK try letting them jump .050 or .075 one time. My 175 RDF's like to jump not uncommon for me to jump them .100 in these over throated factory Rem 700.
    These 175 TMK's with this load worked fine in my 20" factory barrel (2593 fps, ES: 10, SD: 5.5), but still didn't group as well as the 39.6 gr of AR-Comp. Looking at this load for my Krieger 24" barrel in my QuickLoad program, jumping to .050 or .075 will boost my MV to something like 2720 - 2730 fps. Pressure looks to be pretty high at around 61,500 to 62,800 psi. I've only got about 50 TMK's left, so I guess there's no reason not to use some of them with more jump and have some fun at it.



    Quote Originally Posted by mike06 View Post
    As far as bumping the shoulder on a loaded round I do it all the time. I even had to bump some off the shelf Hornady Win 270 for two of my friends. One has a new Rem 700 270 the other was a Tika T3 270. Those rounds had a + .003 head space right out of the box.
    Nice to know that between both of our experiences, doing this works out fine.
    Last edited by straightshooter1; 04-14-2019 at 09:18 PM.
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