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need some QL data...

memilanuk

Gold $$ Contributor
Anybody here w/ Quickload willing to run the numbers on a standard 6mm BR, 27" barrel, using 107gr SMK's... w/ Ramshot Tac, Big Game, and Hunter?

Thanks,

Monte
 
To give you meaningful numbers, I'll need cartridge OAL, whether that puts you in the lands or not, and your actual case capacity. My version of QL doesn't have any data for "Hunter"

That said, it looks like you'll be short on case capacity for "Big Game". With TAC, it shows 2846 FPS for a 29.5gr charge of TAC, at 2.370" seating depth, no land contact, at 59802 psi. This is already in the Red Zone. 30.0 gr gives 62866 psi at 2885 fps. This is WAY into the red zone. Max "safe" charge is 29.2 at 2822 fps.

Big Game max load: 31.4gr,102% density) 2857 fps, 2.370" OAL, 55644 psi.

Keep in mind this is only a computer prediction. I run a charge that lists at about 62,000 psi, at 2895 fps, using ADI 2208 data. ADI 2208 is the same as Varget, officially, but the calcs work better with QL's ADI data than the Varget data which reads about 3000 psi higher!

Always start low and work up! Be Safe.
 
I'll see what I can come up w/ as far as volume, OAL, etc. this afternoon when I wake up. Bedtime for bonzo now ;) Gotta love night shifts.

Thanks,

Monte
 
OK, here's what I got:

Using a Stoney Point tool, average of 5 reads:

107gr SMK, to the lands -> 2.830"
105gr Scenar, to the lands -> 2.825"

Once fired case, w/ spent CCI 450 primer -> 129.8gr
Same case, filled w/ water to the mouth -> 168.6gr
Case volume -> 38.8gr H2O,and yes, I checked this *several* times)

Thanks,

Monte
 
[Note: Monte, when you've pulled down this data, let me know as I don't want these figures posted widely. They are specific to a particularly seating depth and case capacity. People can get in trouble using suggested loads if their cases are different.]

I need to know your cartridge OAL. QuickLOAD uses that to figure out how deep the bullet is in the case. The Comparator numbers you're giving me, I believe are base to ogive PLUS the length of the comparator. Just give me OAL measurements for both bullets and tell me if that is in the lands or not.

I did put my SP comparator on and I got a 2.800 for my rounds which have an OAL of 2.347" with Sierra 105s.,But your comparator may be slightly longer/shorter.) So, adding .025" to that I've come up with an OAL of 2.372" for the 105s. I'm guessing at an OAL of 2.377" for the 107s.,One problem is that QL has two different bullet files for the Sierra 107 MK, and they have two different lengths, 1.254 and 1.260. I picked 1.260".)

[Note: I just don't know how valuable this is to you. The velocities look high. I found with Varget I had to adjust the weighting factor and use ADI 2208 data to get good numbers. Please look at the lot-to-lot burn rate variations at the bottom of each chart--you'll see big differences.]
 
Got it, thanks. The OAL is pretty close... a 107gr SMK seated to 2.805" C.O.L measures about 2.345", and is about 25 thou off the lands.

Thanks,

Monte
 
Actually, that's a pretty big difference. FYI .025" jump is a lot with this case--it will raise pressures substantially. Suggest you play with .010" or so. Anyway, here's the revised data for 107s,using 1.260" bullet length), both for your 2.345" seating depth and my recommended 2.360",.010" jump):

BIG GAME
Cartridge : 6 mm B.R. Norma
Bullet : .243, 107, Sierra HPBT MK 1570, 1.260" bullet length
Cartridge O.A.L. L6: 2.345 inch or 59.56 mm
Barrel Length : 27.0 inch or 685.8 mm
Powder : Ramshot BigGame

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 88 27.90 2540 1532 37286 6549 97.3 1.528
-09.0 89 28.21 2566 1564 38451 6614 97.6 1.507
-08.0 90 28.52 2592 1596 39650 6677 97.9 1.485
-07.0 91 28.83 2618 1628 40893 6738 98.2 1.466
-06.0 92 29.14 2644 1660 42173 6796 98.5 1.446
-05.0 93 29.45 2670 1693 43496 6853 98.7 1.426
-04.0 94 29.76 2695 1726 44861 6906 98.9 1.407
-03.0 95 30.07 2721 1759 46269 6957 99.2 1.388
-02.0 96 30.38 2746 1792 47725 7006 99.3 1.369
-01.0 97 30.69 2772 1825 49230 7051 99.5 1.351
+00.0 98 31.00 2797 1859 50783 7094 99.6 1.333 ! Near Maximum !
+01.0 99 31.31 2823 1893 52390 7135 99.7 1.315 ! Near Maximum !
+02.0 100 31.62 2848 1927 54049 7173 99.8 1.298 ! Near Maximum !
+03.0 101 31.93 2873 1961 55765 7207 99.9 1.281 ! Near Maximum !
+04.0 102 32.24 2898 1995 57539 7239 100.0 1.264 ! Near Maximum !
+05.0 103 32.55 2923 2029 59366 7268 100.0 1.248 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 98 31.00 2835 1910 53883 7021 100.0 1.303 ! Near Maximum !
Data for burning rate decreased by 3% relative to nominal value:
-Ba 98 31.00 2755 1803 47794 7133 98.9 1.366


Cartridge : 6 mm B.R. Norma
Bullet : .243, 107, Sierra HPBT MK 1570, 1.260" bullet length
Cartridge O.A.L. L6: 2.360 inch or 59.94 mm
Barrel Length : 27.0 inch or 685.8 mm
Powder : Ramshot BigGame

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 88 27.90 2535 1526 36973 6556 97.2 1.533
-09.0 89 28.21 2561 1558 38123 6622 97.6 1.513
-08.0 90 28.52 2587 1590 39310 6686 97.9 1.491
-07.0 91 28.83 2613 1622 40534 6747 98.2 1.471
-06.0 92 29.14 2638 1654 41795 6806 98.4 1.451
-05.0 93 29.45 2664 1686 43102 6863 98.7 1.431
-04.0 94 29.76 2690 1719 44449 6917 98.9 1.412
-03.0 95 30.07 2715 1752 45838 6969 99.1 1.393
-02.0 96 30.38 2741 1785 47273 7018 99.3 1.375
-01.0 97 30.69 2766 1818 48755 7065 99.5 1.356
+00.0 98 31.00 2792 1851 50287 7108 99.6 1.338 ! Near Maximum !
+01.0 99 31.31 2817 1885 51870 7150 99.7 1.321 ! Near Maximum !
+02.0 100 31.62 2842 1919 53505 7188 99.8 1.303 ! Near Maximum !
+03.0 101 31.93 2867 1953 55195 7224 99.9 1.286 ! Near Maximum !
+04.0 102 32.24 2892 1987 56941 7256 100.0 1.270 ! Near Maximum !
+05.0 103 32.55 2917 2021 58739 7286 100.0 1.253 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 98 31.00 2830 1902 53353 7036 100.0 1.308 ! Near Maximum !
Data for burning rate decreased by 3% relative to nominal value:
-Ba 98 31.00 2749 1795 47330 7145 98.8 1.371
 
Monte,

I would try for the 30.3-30.4 grain MAX load based on these numbers. But I would start no more than 29.5 grains. With a 2.360" OAL, maybe bump the charge a tenth or two tenths. These numbers make more sense. I think you'll see max between 2880 and 2920--but keep in mind that chronos vary by up to 40 fps from "reality" so you'll have to check your pressure signs.

RAMSHOT TAC
Cartridge : 6 mm B.R. Norma
Bullet : .243, 107, Sierra HPBT MK 1570, 1.260" bullet length
Cartridge O.A.L. L6: 2.345 inch or 59.56 mm
Barrel Length : 27.0 inch
or 685.8 mm
Powder : Ramshot TAC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 85 27.90 2697 1727 48706 6449 99.9 1.377
-09.0 86 28.21 2721 1759 50211 6489 100.0 1.359 ! Near Maximum !
-08.0 87 28.52 2746 1791 51761 6526 100.0 1.341 ! Near Maximum !
-07.0 88 28.83 2770 1823 53356 6561 100.0 1.323 ! Near Maximum !
-06.0 89 29.14 2794 1855 54999 6594 100.0 1.306 ! Near Maximum !
-05.0 89 29.45 2819 1887 56691 6627 100.0 1.289 ! Near Maximum !
-04.0 90 29.76 2842 1919 58433 6660 100.0 1.273 !DANGEROUS LOAD-DO NOT USE!
-03.0 91 30.07 2866 1952 60227 6692 100.0 1.257 !DANGEROUS LOAD-DO NOT USE!
-02.0 92 30.38 2890 1984 62075 6724 100.0 1.241 !DANGEROUS LOAD-DO NOT USE!
-01.0 93 30.69 2914 2017 63980 6755 100.0 1.225 !DANGEROUS LOAD-DO NOT USE!
+00.0 94 31.00 2937 2049 65942 6786 100.0 1.210 !DANGEROUS LOAD-DO NOT USE!
+01.0 95 31.31 2960 2082 67965 6816 100.0 1.195 !DANGEROUS LOAD-DO NOT USE!
+02.0 96 31.62 2984 2115 70049 6846 100.0 1.181 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 94 31.00 2963 2086 69320 6705 100.0 1.188 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba 94 31.00 2907 2008 62570 6877 100.0 1.235 !DANGEROUS LOAD-DO NOT USE!



Cartridge : 6 mm B.R. Norma
Bullet : .243, 107, Sierra HPBT MK 1570, 1.260" bullet length
Cartridge O.A.L. L6: 2.360 inch or 59.94 mm
Barrel Length : 27.0 inch or 685.8 mm
Powder : Ramshot TAC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 83 27.54 2663 1684 46591 6411 99.8 1.403
-09.0 84 27.85 2687 1715 48009 6454 99.9 1.385
-08.0 85 28.15 2711 1747 49467 6494 99.9 1.367
-07.0 86 28.46 2736 1778 50967 6532 100.0 1.349 ! Near Maximum !
-06.0 87 28.76 2760 1809 52511 6567 100.0 1.332 ! Near Maximum !
-05.0 88 29.07 2784 1841 54100 6601 100.0 1.315 ! Near Maximum !
-04.0 89 29.38 2807 1872 55735 6634 100.0 1.298 ! Near Maximum !
-03.0 90 29.68 2831 1904 57417 6666 100.0 1.282 ! Near Maximum !
-02.0 91 29.99 2855 1936 59149 6698 100.0 1.266 !DANGEROUS LOAD-DO NOT USE!
-01.0 92 30.29 2878 1968 60932 6730 100.0 1.250 !DANGEROUS LOAD-DO NOT USE!
+00.0 92 30.60 2901 2000 62768 6762 100.0 1.235 !DANGEROUS LOAD-DO NOT USE!
+01.0 93 30.91 2924 2032 64658 6792 100.0 1.219 !DANGEROUS LOAD-DO NOT USE!
+02.0 94 31.21 2947 2064 66605 6823 100.0 1.205 !DANGEROUS LOAD-DO NOT USE!
+03.0 95 31.52 2970 2096 68611 6853 100.0 1.190 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 92 30.60 2928 2037 65986 6680 100.0 1.211 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba 92 30.60 2871 1958 59556 6854 100.0 1.260 !DANGEROUS LOAD-DO NOT USE!
 

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