What is the cartridge that you are reloading & what powder(s) do you have and what bullets?
The cases are not that important other than overall quality cases such as Lapua
I know this is a dumb question to most , but its one i cant get my head round . If i look at load data for a given powder i cant find the listed bullets to match what i have or if the make of case matters .
Do i say go to HORNADY for data on 140 ELD Match and use the amount of powder listed regardless of powder manufacturer , or any 140gn bullet and any use cases i have .
I found my powder data , looked for hornady 140 ELD and they only had 149 SST , So what do i do to get the correct combination data .
What is the cartridge that you are reloading & what powder(s) do you have and what bullets?
The cases are not that important other than overall quality cases such as Lapua
6.5CM , powder is VIHTAVUORI H555 , And bullets 140 ELD Match . and the brass will be the Hornady i have used . I'm told its follow the bullet data for load + COL , and tweak from there .
Hornady make the bullets, not the powder, I have found in the past that using the bullet makers load data the max loads can be a fair way above the powder manufacturers max loads.
Viht have load data for the 143gn ELDx, this could be your starting point as it is a heavier bullet so the min and max loads should be safe with a lighter projectile.
As for length, I would suggest that you start with a calibre diameter seated into the neck, as long as that isn't reaching the lands.
Thanks , very informative especially the min max safe loads . i have some factory 140ELD MATCH and ive measured those at 2.8 , so im going to stick with that as i will be using the used cases , but a great guide for the depth and i will check that to the factory oal ..
what is the X in ELD X ? , Not that it matters much
MT
Measure the vol. of a fired case accurately and get someone to run all the numbers thru' QL if you want or just start at the lower end or 'something sensibly close' re component combination and develop a load as per normal (or even better the '10 round method' if you fancy being different?)
PM me if you would like to try the former?
Terry
or using the info you've given above thus:
NB usual caveats apply
artridge : 6.5 Creedmoor Hornady
Bullet : .264, 140, Hornady ELD-M 26331 G7
Useable Case Capaci: 47.563 grain H2O = 3.088 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Vihtavuori N555 *C*T
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 92 39.60 2481 1913 37687 9244 98.5 1.511
-09.0 93 40.04 2508 1955 38953 9328 98.8 1.488
-08.0 94 40.48 2535 1998 40261 9406 99.0 1.465
-07.0 95 40.92 2562 2041 41612 9481 99.3 1.443
-06.0 96 41.36 2589 2084 43009 9551 99.5 1.421
-05.0 97 41.80 2616 2128 44451 9616 99.6 1.399
-04.0 98 42.24 2643 2171 45942 9677 99.8 1.378
-03.0 99 42.68 2670 2216 47484 9733 99.9 1.358
-02.0 100 43.12 2696 2260 49076 9784 99.9 1.338
-01.0 101 43.56 2723 2305 50723 9830 100.0 1.318
+00.0 102 44.00 2749 2349 52426 9870 100.0 1.298
+01.0 103 44.44 2775 2394 54186 9908 100.0 1.279 ! Near Maximum !
+02.0 104 44.88 2801 2440 56007 9945 100.0 1.260 ! Near Maximum !
+03.0 105 45.32 2827 2485 57891 9981 100.0 1.242 ! Near Maximum !
+04.0 106 45.76 2853 2531 59840 10016 100.0 1.224 ! Near Maximum !
+05.0 107 46.20 2879 2576 61857 10051 100.0 1.206 ! Near Maximum !
Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 102 44.00 2865 2552 64649 9414 100.0 1.193 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 44.00 2573 2058 40670 10038 96.8 1.441
Fantastic
I would defer to Viht data for the powder.
There was an update last week.
If its a magazine fed rifle load to mag length that feeds reliably - assuming round will chamber reliably.
thanks , i will check out the update
Monkeytree, Thibben has kindly provided you with some useful QL data. In an earlier post he also advises the need to check case volume. He's absolutely right. In my recent experience I have found that the water capacity of fired cases varies to such an extent that a safe load in one brand of brass results in significant overpressure in another brand.
The Useable Case Capacity of 47.563 grain H2O in the example given (for a 140gr ELD-M seated to give a cartridge length of 2.8") would appear to relate to a maximum case capacity overflow of around 54 grain H2O.
My own measurements of fired brass show that Hornady has the most capacity (52.9gr H2O) followed by S&B (51.8), Starline (51.6) and Peterson (50.6). I've yet to find anything near 54.0gr, and in this regard I believe the case capacity given in QL for the 6.5CM brass is well wide of the mark.
The Vihtavuori data does not offer anything for the 140gr ELD-M, and any data provided by Vihtavuori for 6.5CM is for SRP brass which I don't think will be the same as your used Hornady brass which I suspect is LRP.
In other words, PLEASE BE CAREFUL and don't be misled by assuming that all brass is the same. Do as Thibben says and measure your case capacities - it can/will make a significant difference to what's safe and what will give you a heavy bolt lift........