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Old 04-05-2012, 06:34 PM   #11
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As a general rule, if you shoot smaller bullets at a higher velocity it will be harder on your barrel. My dad zipped 140 partitions out his 7mm at 3200 fps and just had to rebarrel it, only got maybe 1000 rounds through it. He did run a .264 WM down it once, but thats another story. Bigger slower bullets should help it last longer.

Also letting your barrel cool between shots helps with that. When things start heating up is when a lot of your throat erosion will occur.



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Old 04-05-2012, 06:41 PM   #12
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Quote:
Originally Posted by Model70
As a general rule, if you shoot smaller bullets at a higher velocity it will be harder on your barrel. My dad zipped 140 partitions out his 7mm at 3200 fps and just had to rebarrel it, only got maybe 1000 rounds through it. He did run a .264 WM down it once, but thats another story. Bigger slower bullets should help it last longer.

Also letting your barrel cool between shots helps with that. When things start heating up is when a lot of your throat erosion will occur.
what do ya think bout running those 225s at around 2800 fps? too fast to make the barrel last?


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Old 04-05-2012, 06:49 PM   #13
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How close is that to your max?

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Old 04-06-2012, 01:06 AM   #14
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Quote:
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How close is that to your max?
according to the books I've seen with a 225gr the fastest they pushed em out at max load was just under 2900 fps with the powder i have (imr4350)

i saw on an old TV show somewhere that if the bullet has a BC of .5 and a muzzle velocity of 2800 fps that in theory the drop and flight path of the bullet will line up with the dots on a mil dot scope every hundred yards.... have ya ever heard that before?
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Old 04-06-2012, 07:44 PM   #15
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According to my Hornady reload book, a 225 SST max load is 68.6 grains of IMR 4350 going 2800 fps. I'd be careful with that and work up to it slowly.

I never heard of the mil dot thing.

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Old 05-26-2012, 02:44 PM   #16
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just put together six different OAL loads gonna take em out and see which one puts down the best groups

each cartridge is loaded with federal magnum primers 71.5 gr of imr 4350 and topped off with a 225g hornady SST



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