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Not your typical request, I realize all loads are to be used with caution at my risk. 300 Saum 225 Hornady match bullet Trail Boss. Desired speed 1050 +/- There is a Trail Boss load published for 300 WSM at 1490 fps with a 150 grain bullet, It seems I can get down to 1050 using a heavier bullet. http://www.imrpowder.com/PDF/Trail-Boss-data.pdfThanks in advance.
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There is no 225g .308 Hornady match bullet in my version of QuickLOAD (v3.6). You'd need to mic detailed measurements of it (length, shank diameter, diameter of boat-tail, length of boat-tail). Also, you don't specify the barrel length or the COAL. If I use the 240g Sierra MatchKing #9245, 24" barrel, case length of 2.003", COAL of 2.825" it gives the results below. USE THIS DATA AT YOUR OWN RISK.Cartridge : .300 Rem SA Ultra Mag
Bullet : .308, 240, Sierra HPBT LR MatchK 9245
Useable Case Capaci: 60.622 grain H2O = 3.936 cm�
Cartridge O.A.L. L6: 2.825 inch = 71.76 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR TrailBoss
Predicted data by increasing and decreasing the given charge,
incremented in steps of 5.376% 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
-53.8 46 8.60 944 475 13063 1135 100.0 3.120
-48.4 51 9.60 1001 534 15057 1259 100.0 2.889
-43.0 56 10.60 1055 593 17091 1383 100.0 2.714
-37.6 62 11.60 1106 652 19178 1506 100.0 2.570
-32.3 67 12.60 1155 711 21321 1629 100.0 2.448
-26.9 72 13.60 1202 770 23526 1751 100.0 2.342
-21.5 78 14.60 1248 830 25794 1872 100.0 2.250
-16.1 83 15.60 1292 889 28128 1992 100.0 2.166
-10.8 88 16.60 1334 949 30530 2112 100.0 2.091
-05.4 93 17.60 1376 1009 33003 2230 100.0 2.022
+00.0 99 18.60 1417 1069 35550 2348 100.0 1.959
+05.4 104 19.60 1456 1130 38172 2465 100.0 1.901
+10.8 109 20.60 1495 1191 40873 2581 100.0 1.842
+16.1 115 21.60 1533 1252 43656 2695 100.0 1.788
+21.5 120 22.60 1570 1314 46525 2809 100.0 1.737
+26.9 125 23.60 1607 1376 49482 2922 100.0 1.690
Results caused by � 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 99 18.60 1417 1071 35915 2346 100.0 1.952
Data for burning rate decreased by 5% relative to nominal value:
-Ba 99 18.60 1416 1068 35134 2350 100.0 1.969
Have you e-mailed Hodgdon and asked for a load with that combo?
“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
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I have not emailed yet but a good suggestion. The Max COAL listed for the 300 saum is 2.825 so I would use that as my magic number as this is a long and sexy bullet. The bullet measures 1.580 in length by itself, boattail is 0.255 with a length of roughly 0.185, Bearing surface (shank?) would be 0.645. I think the Rem M7 mag is a 22 inch barrel but that is relying on a faulty memory. It may not work due to the twist I am working with but I am deciding if I want to use this platform for suppressor use. I know, easier to use a 308 but I don't have one (yet)...
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Shank diameter would be the nominal bullet diameter. Most likely .308. Although, on occasion you will find a .308 bullet that mic's .3075 or .3085, etc.
If I can remember, I'll try and run those numbers tonight although I do think the data for the 240g MK will get you close...
I'm not familiar enough with TrailBoss to know if too light of a charge is dangerous (besides the risk of a squib), but you could start at 9.5g and test up to 11.0g and see what you get...
“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
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Joined: Jun 2009
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USE THIS DATA AT YOUR OWN RISKCartridge : .300 Rem SA Ultra Mag
Bullet : .308, 225, Hornady BTHP Match
Useable Case Capaci: 60.176 grain H2O = 3.907 cm�
Cartridge O.A.L. L6: 2.825 inch = 71.76 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : IMR TrailBoss
Predicted data by increasing and decreasing the given charge,
incremented in steps of 5.376% 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
-53.8 46 8.60 931 462 13170 1254 100.0 2.929
-48.4 51 9.60 987 520 15180 1391 100.0 2.711
-43.0 57 10.60 1041 577 17232 1528 100.0 2.546
-37.6 62 11.60 1091 634 19337 1665 100.0 2.411
-32.3 67 12.60 1140 692 21501 1800 100.0 2.295
-26.9 73 13.60 1186 750 23727 1935 100.0 2.197
-21.5 78 14.60 1231 808 26018 2070 100.0 2.108
-16.1 83 15.60 1275 866 28376 2203 100.0 2.029
-10.8 89 16.60 1317 924 30803 2335 100.0 1.959
-05.4 94 17.60 1358 983 33303 2466 100.0 1.894
+00.0 100 18.60 1398 1042 35877 2597 100.0 1.835
+05.4 105 19.60 1438 1102 38529 2726 100.0 1.780
+10.8 110 20.60 1476 1161 41261 2855 100.0 1.723
+16.1 116 21.60 1514 1221 44077 2982 100.0 1.672
+21.5 121 22.60 1551 1281 46981 3109 100.0 1.624
+26.9 126 23.60 1587 1342 49975 3234 100.0 1.580
Results caused by � 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 100 18.60 1399 1043 36246 2595 100.0 1.827
Data for burning rate decreased by 5% relative to nominal value:
-Ba 100 18.60 1398 1041 35457 2599 100.0 1.844
It looks like QuickLOAD predicts about 10.7g of TrailBoss to get you what you want. I've had QuickLOAD be spot-on before, but I've also had it be 50-70 fps off as well. Considering some of the starting loads for TrailBoss run in the 14k PSI range, I'd think that the predicted 17k PSI at 10.6g should be safe without risk of squibbing. Good luck.
“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
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Thanks so much, I will give it a whirl, at my own risk of course...
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Just noticing this thread. The IMR load data for Trail Boss reduced loads in rifles wants you to start with 70% case fill. I don't know if that is because they are worried about position sensitivity or pressure variation with it? You might call them and ask. A 70% fill in QL goes a little faster than you want. Not subsonic.
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Member William Iorg, who's having a technical problem posting, passes this along: "Nick,
For some reason I cannot access the 24 Hour campfire. I was going to post on the thread about the sub sonic loads for the 300 SAUM.
In my experience it is not a good idea to load Trail Boss below the 70% level. Odd little things begin to happen - significant velocity extreme spreads for one. This is not as eye catching as when Trail Boss is compressed. Compressing Trail Boss raises pressure alarmingly - right now.
I was hoping Trail Boss would fill the void for use as bulk powder but this is not the case.
Greg Mushial has data on his GMDR site for the 300 RUM and the 300 WSM (two very different cartridges, I agree) using fast pistol powders. The data is reliable and only requires an adjustment to your thinking about the manner in which you charge your cases. You cannot afford a double charge.
The difference in case capacity between the SAUM and the WSM is about 7.0 grains which is not a great deal when we are looking at charges of 7.0 to 11.0 grains of Accurate Arms No. 2 or 6.0 to 10.0 grains of Alliant Bullseye pushing a 170-grain cast bullet."
Last edited by Unclenick; 07/25/11.
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download new york escort the no device check one, streaming works but like new york escorts the op said there's an annoying green bar at the bottom and the quality isn't good at all. I'm still going to keep using my unlim 4g w/tethering to my iphone and stream it through there
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Campfire Outfitter
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Crewed get a 308 man. This may not be a good idea, reduced loads are cool, but this is a bit much, IMO.
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Should I get a New York Escort too! I came to that conclusion too.
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