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I am trying to determin how many f/s I will loose per grain of powder.I am using H4350 in .300 win mag 26'' barrel my loading of 74 grains gave me a velocity of 3470 high I know I would like to end up at about 3150-3200 looking for a little input from those of you with a bit more experence than...

Any idea how many f/s per grain I will drop using this powder in this load anyone?

Thank you for all the replys I think I will back off a bit keep velocity in and about 3200 f/s maybe a bit less and leave it at that.

Chrono is a range supplyed device so I'm assuming i't good. Every load I have put through my H.S is so far is under 1'' bolt has been easy to open on all loads the highest case exp. is under .004'' primer pockets are still tight after 5 reloads. brass shows no shiny spots and still geting black...

I have worked up to this load in half grain increments starting with 70 grains of H4350 velocity is usually higher by 150-170 f/s than what the manuals show.My last 5 shot group measured in at just over .5''.What is usually the first sign of to high of pressure?

barrel length on my rifle is 26'' test barrel is 24'' chrony was @ 15' away

I am loading .300 win mag for a H.S precision rifle I am useing 74 gr of H4350 fed. 215 primers and rem. brass and a 168 gr barnes xxx bullet speers manual#13 showes a max charge of 75 gr @3174 f/s and barnes manual #3 showes a max of 73 gr @3152 f/s as of yet I see no signs of high pressure but...