75 gr AMAX .223

You will have to work up an overall length to suit your rifle.
Do you want the rounds to feed from the magazine? If so, there will be a maximum length.
What do you want the relationship of ogive of the bullet to be to the leade of the rifling in your barrel? You will have to work this up.
An overall length used by someone else in a different rifle won't tell you much about your situation.
 
Mag length is generally the determining factor for long for caliber bullets. When single loading I generally try to either jump or jam .0030 to/ from the lands, or seat the bullets the full length of the neck to aid in decent concentricity.
 
Its for a bolt action. I know OAL differ from gun to gun but these 75's are quite long. my manual states 2.260 OAL....seems like they should be seated out a bit further. I think Im gonna pick up a gauge next week.

So is 2.390 specific to the 75 gr AMAX in the Hornady Manual?

Cheers!!
 
I've loaded 500-600 of them... Found very forgiving to seating depth, start at max length in you mag and work from there...

Start around 22gr of H4895 and work up.
 
I found the same thing, the only place I noticed the didn't like to be seated in my rifle was on the lands or jammed.


Hotwheels81 said:
I've loaded 500-600 of them... Found very forgiving to seating depth, start at max length in you mag and work from there...

Start around 22gr of H4895 and work up.
Click to expand...
 
scott_r said:
I've got about 1/2 pound of 4895 left....easier to find a unicorn then a pound of it.

I've got plenty of Varget, H322, Benchmark
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Don't think you can stuff enough Varget Into a .223 case to get good speed with the long 75's taking up plenty of case volume... I recall trying it and I think I had lots I crunching while bullet seating...
 
scott_r said:
Its for a bolt action. I know OAL differ from gun to gun but these 75's are quite long. my manual states 2.260 OAL....seems like they should be seated out a bit further. I think Im gonna pick up a gauge next week.

So is 2.390 specific to the 75 gr AMAX in the Hornady Manual?

Cheers!!
Click to expand...

If you don't have an OAL gauge, load up a dummy round long then continue to seat the bullet a bit at a time till you can close the bolt with just a tiny bit of resistance. Also put marker on the bullet so you can tell how far the bullet is engaging the rifling. This will tell you your max COL for your rifle.
 
If you go longer than 2.425", you will have less than .224 of bearing surface inside the neck. You need to measure your distance to lands. I neck size a fired case and cut down the neck perpendicular to the rim to create a sort of gripping neck to check. Or you can use an actual OAL tool.
 
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