.300 whisper crimp die?

[kurtz]

I was always under the impression that crimping for auto loaders was to keep the bullet from being pushed into the neck as it strikes the feed ramp and/or barrel extension lugs.....before I smoothed out the ramp/barrel extension lugs on my SSK AR I got deep scratches in the bullet and gouges in the neck of the brass in everything from 125's to 220's....I test slam chambered several hundred different rounds checking for marks on the bullet/brass and measuring overall length at the ogive, never had one round move in or out.....

[pug]

Yep with my 6PPCs the bullets are in the rifling and thats where I like them. In fact if I remember right the the .197" group I shot with the AR was with the bullet on the rifling with no crimp. Course there wasn't much bullet seated in the neck but as long as it stayed there till I got the bolt closed I was happy.

[pug]

Oops Kurtz you slipped in there before I could finish typing. Dunno what to say. I just set a 180 gr round nose (which really rides tight in the feed ramps) .220" in to a sized piece of brass and maually fed it from the magazine and it unseated .008". The brass was from Davis which has .004" neck tension so once again I know the bullet will move. One other difference is whether your chamber is tight or not. My 300 fireball chambers freely with the shoulder stopping the case movement not the body.

[snowhack]

I don't mind the jump-ons.......


I use the Lee factory crimp die on my .270 Win. (launched via a Model 700) I don't see much diff in accuracy, crimp and no crimp, as I don't crimp my match loads. I do know of heavy slugs moving in cases that may have a loose neck...in autos. The 240gr Match King comes to mind.
I seated a couple of 180gr Hornadys in my brass and they go in pretty tight. Tighter than my .270s. I use .223 military brass and the necks are formed down after cutting the case to 1.40" or so (final trim of 1.35"). I keep the expander pin in regardless because I think it makes a more uniform neck shape. My seated neck diameter is .330". I don't have the crimp die yet so I don't have the crimped measurement. If its diff that is. I ordered it today.

What were we talking about again?

[kurtz]

when I was working on the ramp I would feed the rounds from the magazine dropping the bolt with the bolt release....I'm using Hornady dies and .223 brass and end up with the same as you .004 neck tension, unless using Hawk and one other bullet that I can't think of the name..I end up with .005 neck tension with those....never had any move chambering....I probably get a little carried away realoading, nitrile gloves, de-oil bullets, one tumble to polish brass..another tumble to de-oil brass.....OCD

[Foxfire]

I use a 30 carbine Lee crimp die with a 3/8 fender washer sitting around the bullet. Took my calipers and went to H--- D--- and miked a few different thicknesses. I can put my crimp any place I like.
I even drilled a 1/8 hole at opposite edges and suspended it next to the die so to be out of the way. WORKS GREAT FOR ME

Fox out!

[snowhack]

I got my M1 carbine die and started crimping the cartridges I loaded already. I didn't see a large crimp band. If what I saw was the crimp band it was only a milimeter thick. I trim cases to 1.34" is this why or am I doing something wrong?
I tighten the crimp die to the shell holder and then about 3/4 of a turn or so more. Seems to work fine.