Looking at the SAAMI for 10 mm (and if I?m reading it correctly) the case at the mouth with no projectile = .424
With a projectile = .423
Last time I crimped I went to .421

Purchased new, do not remember the date, fires fine still.

Guys,
Thanks for the info.
The bags are interesting and worth having, I?ll be getting those and trying them out.
When you use case lube on the inside of your dies, i am assuming you clean that out before using them?

Thanks for both replies.
I am thinking of using eezox on the inside of my dies because it is dry after it coats and won?t have powder hang up.
The listed test was very interesting. I have frog lube that I use on my guns so now I have to consider using it on my dies.

Looking for what everyone does to protect their dies from rust (inside and out)?
I am considering using eezox to protect the dies.
I suspect I am not the first person to ask this but when I did a search I came up empty.
Thanks
Carl

Shadow,
Thanks
I am using the Lyman 4 die set, with the taper crimp as a separate last step.
One thing that was different, the round that had the issue was the last one in the magazine

Thanks Shadow, I?ll give it a try

Thanks guys
My kimber has never (had it for 6 years or so) failed to feed anything I?ve put through it. I guess I?m surprised the bullet setback changed so easily. I ha 2 different text for seating depth, one said 1.25 and the other said 1.26.  I?ll try seating it deeper for the next go round. Question: should my taper crimp be tighter to support the bullet better?
Appreciate the help

Took my first 5 rounds (ever) to the range today to test my work.
Once fired Starline brass
Federal no 150 large pistol primers
Hornady 10mm 180 gn FMJ-FP
Allianz powder - power pistol
Loaded to 8.4 gn
COAL 1.26
I also measured the case following the taper crimp and it was .422
I first shot 5 rounds of Georgia Arms factory 180 gn FMJ-FP?s as a starting point, only 2 of the 5 rounds registered on the chrono ( I have some work to do on using the chrono) and they came out as:
1133
1118
I put my reloaded 5 rounds in with the following results on the chrono:
1191
1207
2 shots did not register and the last round would not feed
When I got home I measured the last round and it was 1.198 ( I have verified all rounds at 1.26 when I loaded them)
Also checked the case diameter at the crimp and it was .422
The case has some ?scratch? marks on it that look odd (not there prior to attempting to feed it in the pistol (I attached a photo)
I was using a kimber 1911 with a 5? barrel
Any thoughts on what I did wrong?

I was lucky enough to purchase 4# of power pistol from Powder Valley 2 days ago. They seem to have stock rotate in frequently

Hello,
I am new to the forum and new to reloading.
I have been shooting 10mm since I purchased, new, my Wyoming Arms 10 (which I still have in my collection).
Decided to try reloading and 10mm seemed like a good place to start.
I have:
300 once fired starline brass, deprimed and cleaned.
1k federal large pistol primers.
2 lbs of power pistol
1 lb of HS-6
100 hordany 180 gr fmj-fp.
200 hordany 155 gr xtp.
A Lyman turret press
Lyman dies
A scale, tricker, and powder measure
Calipers
Lyman 50th edition reloading book and Hornady reloading app
A 10mm case gauge
A frankford arsenal hand primer
A chronograph arrives tomorrow

I?ve done a lot of reading and looking to shoot my first reloaded rounds this weekend.
I appreciate all the info everyone posts here.

Looking forward to participating.

Any insights are weclome.
Thanks

Carl