Hi folks
Hopefully someone with Quickload can help me out here. I have unfortunately run out of powder which means I've had to switch, and wanting to preserve my 155.5 BT supply for when I get more H4895, I've used a 175 Berger. unfortunately I was unable to chrono today and next stop is Stickledown.
The load which worked OK was:
175 Berger BT
44.0 IMR4320
Lapua case
Fed 210M primer
COL 2.245 to the ogive
Barrel is a 30-inch 12-twist 5C Broughton.
Hopefully this info is enough to get an approximate muzzle velocity from quickload! Many thanks in advance!!
Muzzle velocity help - quickload assistance required
Moderator: dromia
Forum rules
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
Re: Muzzle velocity help - quickload assistance required
QL does not work from the Ogive so I would need the true OAL taken from head to meplat. Right now basing your numbers on a nominal 2.850" it looks to be a steady load. Can you also confirm the ID number for the 175's please.
-
Mr_Logic
Re: Muzzle velocity help - quickload assistance required
Full OAL 2.905.
Berger part number 30420.
Many thanks :-)
Berger part number 30420.
Many thanks :-)
-
Mr_Logic
Re: Muzzle velocity help - quickload assistance required
Odd thing though, in terms of pressure was getting flat primers. Could go to 44.5 gr, but at 45.0 primers were all distinctly flat, and one had the soot round the edges so definitely pressure signs. Max load in the Hodgdon book is 45.7gr so I am somewhat puzzled!
Re: Muzzle velocity help - quickload assistance required
Cartridge : .308 Win. (SAAMI)
Bullet : .308, 175, Berger LRBTHP #30420
Useable Case Capaci: 49.127 grain H2O = 3.190 cm³
Cartridge O.A.L. L6: 2.905 inch = 73.79 mm
Barrel Length : 30.0 inch = 762.0 mm
Powder : IMR 4320
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 79 35.20 2239 1947 28551 4622 93.3 1.811
-18.0 81 36.08 2289 2036 30343 4749 94.2 1.766
-16.0 83 36.96 2339 2126 32245 4871 95.1 1.723
-14.0 85 37.84 2389 2219 34266 4988 95.9 1.682
-12.0 87 38.72 2439 2312 36412 5099 96.7 1.641
-10.0 89 39.60 2489 2408 38695 5203 97.4 1.599
-08.0 91 40.48 2539 2504 41121 5301 97.9 1.556
-06.0 93 41.36 2588 2602 43705 5392 98.5 1.515
-04.0 95 42.24 2637 2702 46454 5476 98.9 1.476
-02.0 97 43.12 2685 2802 49386 5552 99.3 1.438
+00.0 99 44.00 2734 2904 52511 5620 99.6 1.402
+02.0 101 44.88 2782 3006 55849 5679 99.8 1.367 ! Near Maximum !
+04.0 103 45.76 2829 3110 59413 5730 99.9 1.333 ! Near Maximum !
+06.0 105 46.64 2876 3215 63229 5773 100.0 1.300 !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 99 44.00 2833 3119 62457 5381 100.0 1.315 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 44.00 2590 2606 43474 5618 95.5 1.516
Bullet : .308, 175, Berger LRBTHP #30420
Useable Case Capaci: 49.127 grain H2O = 3.190 cm³
Cartridge O.A.L. L6: 2.905 inch = 73.79 mm
Barrel Length : 30.0 inch = 762.0 mm
Powder : IMR 4320
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 79 35.20 2239 1947 28551 4622 93.3 1.811
-18.0 81 36.08 2289 2036 30343 4749 94.2 1.766
-16.0 83 36.96 2339 2126 32245 4871 95.1 1.723
-14.0 85 37.84 2389 2219 34266 4988 95.9 1.682
-12.0 87 38.72 2439 2312 36412 5099 96.7 1.641
-10.0 89 39.60 2489 2408 38695 5203 97.4 1.599
-08.0 91 40.48 2539 2504 41121 5301 97.9 1.556
-06.0 93 41.36 2588 2602 43705 5392 98.5 1.515
-04.0 95 42.24 2637 2702 46454 5476 98.9 1.476
-02.0 97 43.12 2685 2802 49386 5552 99.3 1.438
+00.0 99 44.00 2734 2904 52511 5620 99.6 1.402
+02.0 101 44.88 2782 3006 55849 5679 99.8 1.367 ! Near Maximum !
+04.0 103 45.76 2829 3110 59413 5730 99.9 1.333 ! Near Maximum !
+06.0 105 46.64 2876 3215 63229 5773 100.0 1.300 !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 99 44.00 2833 3119 62457 5381 100.0 1.315 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 44.00 2590 2606 43474 5618 95.5 1.516
Who is online
Users browsing this forum: No registered users and 11 guests