RDF for 300acc, using Hodgdon CFE BLK. Has any one tried to reload 300acc using these bullets with cfe blk. I reloaded 5 rounds so far to an OAL 2.260

[BetoArmen]

Does any one have any load data they could share. I'm using RDF 175gr for 300acc with CFE BLK powder. I started the first 4 rounds with 17.9 gr of powder and noticed I was having issues seating the bullet. I drop the powder to 16 gr and it will seat to 2.260. I'm concerned with pressure being that the bullet is a little longer than other types. Thanks in advance

 

[jimbires]

17.9 grains is at 103.9 % case fill . this is nothing to worry about . are you using a drop tube funnel ? the drop tube funnel should settle the powder enough that seating the bullet at 2.260 " would be no problem . 17.9 grains at 2.260" gives 43115 PSI which is a mild load. 19.1 grains should be a max charge giving 54633 PSI , with 110.9 % case fill . the 300 AAC is rated at 55000 PSI . .


Cartridge : .300 AAC Blackout (SAAMI)
Bullet : .308, 175, Nosler RDF HPBT 53170
Useable Case Capaci: 17.619 grain H2O = 1.144 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon CFE BLK *C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 83 14.32 1359 718 22494 1933 72.5 1.941
-18.0 85 14.68 1393 754 23939 2002 73.7 1.888
-16.0 87 15.04 1427 792 25492 2072 74.9 1.823
-14.0 89 15.39 1462 830 27160 2141 76.1 1.776
-12.0 91 15.75 1496 870 28954 2210 77.3 1.729
-10.0 93 16.11 1531 911 30886 2278 78.5 1.684
-08.0 96 16.47 1566 953 32967 2346 79.6 1.641
-06.0 98 16.83 1601 996 35213 2412 80.8 1.598
-04.0 100 17.18 1636 1040 37640 2478 81.9 1.557
-02.0 102 17.54 1672 1086 40267 2542 83.0 1.515
+00.0 104 17.90 1707 1133 43115 2605 84.0 1.474
+02.0 106 18.26 1743 1181 46210 2666 85.1 1.434
+04.0 108 18.62 1780 1231 49580 2726 86.1 1.396 ! Near Maximum !
+06.0 110 18.97 1816 1282 53258 2783 87.1 1.358 ! Near Maximum !
+08.0 112 19.33 1853 1334 57284 2839 88.0 1.322 !DANGEROUS LOAD-DO NOT USE!
+10.0 114 19.69 1890 1388 61703 2892 89.0 1.286 !DANGEROUS LOAD-DO NOT USE!

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 104 17.90 1809 1272 51030 2747 91.1 1.373 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 17.90 1589 981 35729 2385 75.1 1.600

 

[BetoArmen]

Thanks for the info, I am using a drop funnel. I was running into the issue of my bullets getting stuck in the seating die. I dropped the powder load and it seemed to fit better.

 

[jimbires]

when the bullet gets stuck in the seating die , it's caused from the seating stem not matching the bullet profile . some die makers offer different seating stems to match other bullets profiles . you might want to give your die maker a call and see if they offer one to match the RDF profile . this gets to be more of a problem when you have a compressed powder charge . compressing the powder forces the bullet into the seating stem with more force . also watch for inconsistent COAL's . this happens more with compressed powder charges too . the correct seating stem will help with both of these problems .