270AR load data only - Page 2
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  1. #11
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    Quote Originally Posted by Orionsrevenge View Post
    Any thoughts on what causes the vertical-horizontal-vertical between the 1.894- 1.897- 1.900?
    It could be it was getting short enuff to start to raise pressures, not on the perfect powder node.

    going to retest with 1.912 or 2.27 oal and see what it does with 3 5 shot groups. and i will shoot 5 over the chrono.

  2. #12
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    Finally found thee load. I've had lots of good loads, but this is my baby for shooting targets or where I might lose brass in the grass. I used winchester 308 brass, neck turned and prepped as normal. 34 gr imr8208, 130 gr nosler ballistic tip, oal 2.290". I didn't set up my chronograph, but they are plenty warm. It leaves one slightly out of round hole in the target at 75 yards, shooting prone over my shooting bag. I was basically just checking for pressure, so the groups really surprised me. The 3 shot groups were under 1/4", so figure maybe .3-.4 moa. Today was more about letting the kids blow through some 22 shells, but I had a couple loaded up to check real quick. 34.5 gr shot nearly as well, but they were too warm for my likings. I have about .005" shoulder bump. I'll edit this post once I run them over a chrono.

  3. #13
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    Quote Originally Posted by sucngas View Post
    Finally found thee load. I've had lots of good loads, but this is my baby for shooting targets or where I might lose brass in the grass. I used winchester 308 brass, neck turned and prepped as normal. 34 gr imr8208, 130 gr nosler ballistic tip, oal 2.290". I didn't set up my chronograph, but they are plenty warm. It leaves one slightly out of round hole in the target at 75 yards, shooting prone over my shooting bag. I was basically just checking for pressure, so the groups really surprised me. The 3 shot groups were under 1/4", so figure maybe .3-.4 moa. Today was more about letting the kids blow through some 22 shells, but I had a couple loaded up to check real quick. 34.5 gr shot nearly as well, but they were too warm for my likings. I have about .005" shoulder bump. I'll edit this post once I run them over a chrono.
    I was pretty much running the same load. 34grs of 8208 in 308 win brass with 130gr Nos BTs. I was running about 2850fps. The brass is trash! 33grs of N530 with the same bullet and brass will get you about 2850fps. Brass is trash! I'm gonna see how Lapua holds up. Gonna use the same load with a 110gr AB and work up if I can.

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  5. #14
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    Loaded some 110gr ABs. Loaded to 2.300 to fit in a PRI gen1 mag. Still had .055 clearance to the lands.

  6. #15
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    120SST / CFE223
    COAL - 2.265"
    Trim to: 1.646"
    Lapua 6.5x47 brass
    Neck thickness: .0145" *
    Remington 7 & 1/2 primer
    Powder Charge: 39.9 or 40.0
    Ten Shot Accuracy: 1" @ 100 Yards.
    Velocity: 2900 ft./sec @ 94°. Slower with cooler temps.




    120SST / 1200R
    COAL - 2.265"
    Trim to: 1.646"
    Lapua 6.5x47 brass
    Neck thickness: .0145" *
    Remington 7 & 1/2 primer
    Powder Charge: 34.0
    Ten Shot Accuracy: 1" @ 100 Yards.
    Velocity: 2850 ft./sec @ 94°. Not sure of any temp sensitivity?

    Both of these loads shoot very similar point of impact for my rifle.

    * Neck thickness is not uniform for the entire length of the necks of this brass. I am only taking off the minimum to get these to chamber. The case neck at the mouth is thinner than near the shoulder.



    edit: I wanted to update with the fact that my data is based on previously fired brass and I resize using two different dies. I have the Whidden custom (original) full length sizing die and I have my original RCBS neck bushing bushing f/l sizing die.

    I don't remember exactly how I arrived at my current procedure but I use the Whidden die first to set the headspace with the use of the expander ball. I then follow up using the RCBS die as a makeshift small body die. My Whidden die does not seem to size the case body enough and I think my RCBS die doesn't prevent my turned necks from becoming thicker.

    This procedure is probably not necessary for everyone but it does work for me.
    Last edited by wildfowler; 11-03-2014 at 01:17 PM.

  7. #16

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    All loads I post will use Lapua brass, CCI 450 primers and will be 2.285" long.
    I have not chrono'ed any of these but I will... when it stops raining, I'm 75 miles north of Seattle so maybe June or July.
    Most of these are 2 or 3 shot ladders in .5 gr. steps watching for pressure signs and noting accuracy. 100 yds. bench with sand bags front and rear
    110 gr. TTSX
    Benchmark
    36.5 - 38 grs. 37.5 primer getting flat 1/2" group
    38 grs. HOLY **** pronounced ejector marks, primers way flat, primer pockets not holding new primers...
    XBR 8208
    37 - 38.5 grs primers edges still round all 4 groups 1/2"-5/8" nice load, need to chrono, powder is a bit compressed.

    130 gr. Nosler Part.
    Varget 36 -38 grs. Very mild, groups started about 1/2" to one ragged hole at 37grs. then opened up to 1-1/4 & 1-3/4" Don't think I can get to next node.

    XBR 8208 36 grs. Stout load, primers a little flat, 5 shot group 1" tall 1/2" wide, will go up .2 grs each step from here but if group gets bigger I'll be happy with this as is.

    130 gr. Berger Classic Hunter G1 BC .497
    XBR 8208 34 grs. 5 rds 1" primers still round
    35 grs. 3 rds. 3/4" primers still look good
    35.5 grs. 3 rds. one triangle shaped hole, primers a little flat, stout load need to chrono but I think it's a keeper.

    That's all for now

    Bud

    UPDATE: 110 gr. ttsx / XBR- 38 gr 2944-2972 FPS

    130 gr berger / XBR- 35.5 gr 2735-2750 FPS

    130 gr nos. part. / XBR- 36 gr 2748-2757 FPS
    Last edited by Kyfho; 11-02-2014 at 12:21 PM.

  8. #17
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    I finally got a chronograph so I will try to contribute. Please keep in mind that I am a novice reloader so please take my pressure observations with a grain of salt. One thing to note is the point of impact of the cfe was about 4 in lower than 8208 and h335. I got good accuracy(3 round groups) from all the h335 and 8208 and not from cfe. I will try it again and report back.


    130SST / 8208
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    Charge. Avg speed
    35.5. 2874
    36. 2888. (Flattened primers)
    36.5. 2910 (too hot. Cratered primers)
    37. 2927. (Too hot. Cratered primers)




    130SST / h335
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    charge. Avg speed
    35.5. 2804
    36. 2816
    36.5 2849 (flattened primers)




    130SST / cfe223
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    charge. Avg speed
    37.5. 2735
    38. ? Phone messed up
    38.5. ?phone messed up
    39. 2897 (I will work up in smaller increments)
    Last edited by mcl; 11-10-2014 at 10:33 AM.

  9. #18
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    I have a velocity update with the 120 SST and CFE223. I shot five rounds across my chronograph in 35° temperatures this morning. Low velocity was 2777 ft./s and High was 2840 ft./s with an average of 2795 ft./s.


    I guess the velocity hasn't changed too much from when it was 50 to 60° temperatures?


    I just banged the shots out as quick as I could without even trying too hard. Point of impact had not changed and the group total was still right at 1 inch.


    I reported earlier this summer that I got 2950 ft./s during some testing using a slightly higher powder charge. I actually saw that on two different occasions but I know the temps were above 95° so I don't think that number is realistic and should be discounted.


    For this load upper 2800 - 2900 ft./s is probably realistic for hot summertime conditions and in colder weather upper 2700 - 2800 ft./s with this load.


    And at the slower speeds in cooler temperatures this bullet does behave more like a big game bullet and less like an explosive varmint bullet on deer which is probably not a bad thing anyway.


    40.0 CFE223
    2.265" OAL
    120 SST
    Lapua x47
    Rem 7.5 primer
    .0145" neck


    This load seem so stable to me I should probably set up my powder measure to speed up loading it. As it stands now I've gotten very lax on how much precision goes into powder trickling anyway.


    I've got 250 pieces loaded up and ready for action.

  10. #19
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    I don't remember five posted this already on this site and I need to shoot it one more time to verify the load using the 110 Barnes TSX bullet. It has checked out twice so far and I expected to be good to go.


    I think I have found the ideal seating depth for my gun of 2.275 inches over 40.5 grains of CFE223.


    Back when I did this testing the temp was somewhere between 50 and 65° and I got a velocity of 2900 ft./s. I'm sure it will be a little less than that in 35° temperatures.

    Barnes 110TSX
    40.5 grains CFE223
    Lapua x47 case
    Rem 7.5 primer
    2.275" OAL
    .0145" neck
    2900 ft./s

  11. #20
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    I was able to get out on Saturday and chrono some more loads. I only shot 2 per charge, in hindsight I should have shot more to get a better avg. The speed numbers were down a little even with more powder in some cases. I can think of two possible causes. The first is the temperature difference around 75 for the first set of numbers and anywhere from 50 (mid morning) to 65 for Sat. I also realized that when I reloaded the previous outings rounds that I didn't calibrate my scale. I have a cheap hornady scale and i am not sure how accurate it is. The newest set was calibrated. One interesting note; my buddy was shooting .270 Win Monarch 130 gr softpoints @ 2850 FPS so the 270 AR with SST's was outrunning them by a little.

    Old outing approx 75 degrees
    130SST / 8208
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    Charge. Avg speed
    35.5. 2874
    36. 2888. (Flattened primers)
    36.5. 2910 (too hot. Cratered primers)
    37. 2927. (Too hot. Cratered primers)
    NEW
    130SST / 8208
    Temp 55
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    2 shot average
    Charge. Avg speed
    36.7 2895
    36. 8 2897
    36.9 2915 (mild swipes) (this is going to be my deer round, starting tomorrow)
    37 2904 (mild swipes)
    I know I origially said that 36.5 was too hot but I went back and looked at the brass and decided that the primers were just a little flat. With the colder weather (or accurate scale) these seem to be fine. All of these were accurate with the entire 8 shot group covering about 1.5 in

    Old Temp approx 75
    130SST / h335
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    charge. Avg speed
    35.5. 2804
    36. 2816
    36.5 2849 (flattened primers)
    I didn't re shoot the H335 the pressure was too high and I wasn't getting the velocity of 8208


    Old, Temp approx 75
    130SST / cfe223
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    charge. Avg speed
    37.5. 2735
    38. ? Phone messed up
    38.5. ?phone messed up
    39. 2897 (I will work up in smaller increments)
    New
    Temp 57
    130SST / cfe223
    COAL - 2.95
    creedmore brass (fire formed)
    Winchester large rifle primers
    2 shot average
    charge. Avg speed
    39.1 2787
    39.2 2801
    39.3 2805
    39.4 2831
    39.5 2821
    I have no idea why the velocity is down from last time. Again, I am blaiming the lack of calibration of the scale. I might revisit this after deer season. The cases still look good but the case is getting close to it's capacity. One thing to note is the point of impact between the 1st and 2nd shot was different. I hit the bulls-eye on every second shot but the first was consistently one inch lower.


    I also did some playing around with Barnes 85 tsx. I was surprised to see my impact was virtually the same at 100 yards between the TSX and the SST. Please note that they are not all loaded to the same length.

    Temp 61
    85 TSX / AA2200
    COAL Varied
    creedmore brass (fire formed)
    Winchester large rifle primers
    2 shot average
    Charge, COAL, Avg speed
    37.5 2.25 3345
    37.7 2.26 3355
    37.9 2.295 3327
    38.1 2.295 3350


 

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