[kildar]

If I use 55gr FMJBT MG bullets for .223. Does the boattail allow me to skip case mouth chamfering or should I still chamfer?

[M ammo]

Do all of your case prep. Don’t skip any steps. You will be asking for problems if your brass is not prepped correctly.


Jim M ammo

[BerKim]

For 3 Gun.. I don't bother with chamfering.

You might try it both ways, see if it gains you anything.

I'd guess more people don't, then do.

[M ammo]

Brass length is a problem, if for any reason your brass is long,, it will jamb in your gun.
If your brass is the exact length, and you have a bur on it when it chambers, you might have enough to jamb up your gun.

I full length size,, trim the brass,,, about 5 thousands shorter than the specification, Chamfer the inside and outside of the case neck, ream the primer pocket.
I load it,, check the OAL make sure it fits in my Magazines, Chamber gauge them. Re- checking the primers when Chamber gauging them.
Run them in the Vib polisher until they are clean and shiny.
Then put them in those 100 round containers,,, and label them,,, with the bullet, the type and weight powder, the Velocity from when I Crony them. And the date.

Jim M ammo

[GentlemanJim]

M ammo, on Jul 7 2009, 08:39 AM, said:

Brass length is a problem, if for any reason your brass is long,, it will jamb in your gun.
If your brass is the exact length, and you have a bur on it when it chambers, you might have enough to jamb up your gun.

I full length size,, trim the brass,,, about 5 thousands shorter than the specification, Chamfer the inside and outside of the case neck, ream the primer pocket.
I load it,, check the OAL make sure it fits in my Magazines, Chamber gauge them. Re- checking the primers when Chamber gauging them.
Run them in the Vib polisher until they are clean and shiny.
Then put them in those 100 round containers,,, and label them,,, with the bullet, the type and weight powder, the Velocity from when I Crony them. And the date.

Jim M ammo

This is the way its done
Most jams in AR15s are the result of poor ammo
And misses at long range targets will occur with sub standard ammo as well

If its worth doing....its worth doing to the best of your ability.
My 2 cents worth...Jim

[chendersby]

Get a good case trimmer and it will take care of this for you. Giraud and Gracey trimmers chamfer inside and out as it trims.

Does not take much to cause problems with rifle ammo and at 300 yards the problems are magnified.

[uscbigdawg]

The Lee Zip Trim works too. Yes...it really does.

Rich

[M ammo]

http://www.possumhol...e-trimmers.html

Get the power adapter.... with the cutter,, your chamfer tool,, will fit in the power adapter,,,too...

fast, easy,, cheap$$$$$$

Jim M ammo

This post has been edited by M ammo: 07 July 2009 - 10:50 AM

[dickwholliday]

i asked Dillon about this topic once and was told that they don't chamfer the inside or outside after trimming with their trimmer....i've been using their trimmer for several years now and my 223 and 308 run great and reload great as long as i'm using boat tail bullets........a buddy gave me 800 bulk Remington "flat base" bullets and i had to break out the chamfering tool to get them to seat......D I C K

[charliez]

I use an RCBS chamfer/deburr hand tool, all it does is really cut the brass edge at an angle.

So was wondering if anybody has ever mounted their carbide cutter blade at a 45 degree angle and then trimmed their case? It would leave a very sharp outside edge, but it would trim and chamfer the inside of the case nicely.

This post has been edited by charliez: 24 July 2009 - 08:59 PM