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  #1  
Old 02-16-2017, 08:02 AM
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Reloading. 300 Win Mag


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I have been reloading for 20 plus years. I like the control I get out of a single stage press over my cartridges. I am looking for information on a 168 gr Sierra matchking Bullet. Using IMR 4350 powder, the heaviest powder load I can find is 71 gr., in my .300 Win Mag. However, a Hornady 168 HPBT list IMR 4350 with a 72.5 gr. charge of powder. My question: Can I use the heavier charge of 72.5. of imr 4350 with my Sierra 168 matchking? I have seen no written data on the 72.5 gr. charge on the match King, but the bullet weights between the Hornady and the Sierra are the same. My rifle is a Savage 110 FP in .300 Win Mag. Thanks!
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Old 02-16-2017, 02:46 PM
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Welcome to the forum Titan1963.

300 WM is a favorite cartridge of mine. I have Sierra data in front of me right now, and the charge table for the 168 gr. HPBT MK with IMR-4350 is minimum 65.9 gr. - 73.8 gr.. 20 years of reloading under your belt should tell you to start low and work up while monitoring velocities and other physical signs of pressure, bolt lift, extractor button transfer impressions, primer flow and cratering, case head measurements taken prior to and post firing, and the general appearance of the brass all tell a story.

I've had very good accuracy with IMR-4350 for more than 30 years in the 300 WM. But I've also had great accuracy with RL22, H4831, and IMR-4831. The key here though, is to work up so you don't skip past an accuracy node.

SMOA
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  #3  
Old 02-16-2017, 02:54 PM
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The Speer #12 reloading manual lists a max of 74 grains of IMR 4350 for a 168 grain BT hollow point match bullet. This is a Speer bullet and not a Sierra but very similar. Starting load is 70 grains. Work up and be safe.
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  #4  
Old 02-16-2017, 06:26 PM
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Location: Southeast, Ohio
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Thank you both very much!! I have been on here before, under a different user name. But a computer crash left me with absolutely ZERO information about my account and much reloading data was lost. I had to start all over. Lesson? Never trust all your vital information to a computer!! Submoa, yes, I am aware of building up to higher charge weights and watching for signs of pressure. A friend of mine and I started reloading about the same time. He went off recipe one day and a overload accident took 2 of his fingers off. So in my own history of reloading I will always look for a load in a respectable source of print! Magilla26, did the manual #12 give the velocity for the 74 gr. load? Thank you both very much!!��

Last edited by Titan1963; 02-16-2017 at 06:53 PM.
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Old 02-17-2017, 01:22 PM
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Speer #11 - max. 74.0 gr. IMR-4350 168 gr. Match BTHP = 3063 fps

Sierra states 168 gr. HPBT MK - max. 73.8 gr. IMR-4350 = 3300 fps.

Hornady 168 gr. BTHP max. 69.8 gr. IMR-4350 = 3100 fps

Hodgdon - Hornady 168 gr. BTHP IMR-4350 max. 72.5 gr. = 3089 fps

SMOA
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Old 02-19-2017, 06:04 AM
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What Submoa said. Same data.
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