Case trimmers

[five.five-six]

I have a Lyman hand crank trimmer and some trimz-it trimmers. The Lyman seems to slip and I keep ruining good cases. The trimz-it indexes off the shoulder which is great for headspace but guess what? My crimp die indexes off the headstamp. trimz-it doesn’t account for web stretching so on a 550 I have to trim between sizing and charging stations. Might as well just use my single stage in that case.

[OLD-skool454#3]

I use the LE Wilson/SINCLAIR trimmer and have been pretty impressed and happy with it.

[ar15barrels]

I have a Lyman hand crank trimmer and some trimz-it trimmers. The Lyman seems to slip and I keep ruining good cases. The trimz-it indexes off the shoulder which is great for headspace but guess what? My crimp die indexes off the headstamp. trimz-it doesn’t account for web stretching so on a 550 I have to trim between sizing and charging stations. Might as well just use my single stage in that case.

Buy a Dillon trimmer and setup a case processing toolhead with an RCBS lube/decap die in station 1 and the Dillon trimmer in station 3.
Make sure to set the lube die so it counteracts the trimmer in station 3 to eliminate the shellplate platform flex that you are getting while sizing.
The platform flexing while sizing is why you get variation in shoulder length which then translates into trim length variation that is messing up your crimps.
The Dillon trimmer references off the case head because it's mounted in a press.
The Dillon trimmer sizes and trims in one station.
You need to decap separately and then neck expand afterward.
The neck expanding gets done by another decapping die that you install in your LOADING toolhead to clear out primer pockets of any media from the tumbling that you do to remove the lube from the case processing toolhead.

[Spyder]

Giraud is the way to go.

[Sailormilan2]

I agree that the Dillon setup is the way to go. But then I use a Hornady LNL. I resize and deprime in position #1, and resize again and trim in position #3. This allows trimming with no extra effort, and works well for all my rifle calibers.

[ar15barrels]

I have both the Dillon and Giraud trimmers so I know the strong and weak points of each.
Giraud is the way to go if shoulder lengths are consistent.
Since the OP specifically said he has a shoulder length inconsistency, then the Dillon is the better way to go since it references the case head instead of the shoulder.
By getting the trim lengths exactly the same, the crimps are more consistent since the crimping operation also references to the case head.