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Due to the unavailability of certain components, I’ve resorted to 165 gr .311” Hi Tek coated Whitetail #4 from Missouri Bullet Co for my Marlin 336. I’ve been loading 16 gr IMR-4227 for about 1500 FPS, and they do very well. Question is, how fast can I go with these bullets? The bore slugs at .310”, and most cast data I have shows gas checked loads with a starting velocity much higher than what I’m doing. I have other powders, but have been afraid of using them because the start data is usually 1700-1800 FPS, and I don’t want to lead the barrel.
 

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Due to the unavailability of certain components, I've resorted to 165 gr .311" Hi Tek coated Whitetail #4 from Missouri Bullet Co for my Marlin 336. I've been loading 16 gr IMR-4227 for about 1500 FPS, and they do very well. Question is, how fast can I go with these bullets? The bore slugs at .310", and most cast data I have shows gas checked loads with a starting velocity much higher than what I'm doing. I have other powders, but have been afraid of using them because the start data is usually 1700-1800 FPS, and I don't want to lead the barrel.
It's a good bullet. Hardness is 18 IIRC. I shoot the #1 Whitetail in my 300 BLK and 30-30. I have no trouble with 1800 FPS. If I wanted to go faster I would start looking at gas checked bullets.
 

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Hi-Tek shouldn’t cause leading.
 
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