Page 1 of 1 1
Topic Options
Rate This Topic
#207105 - 06/09/20 10:11 PM Case trimming question
Mr. Bisley
member


Registered: 06/18/19
Posts: 118

Offline
When cutting down 500 S&W cases to 500 JRH cases.

Should I size the virgin case first before cutting off excess case?

Top
#207106 - 06/09/20 11:58 PM Re: Case trimming question [Re: Mr. Bisley]
Carpe Diem
journeyman


Registered: 07/11/08
Posts: 94
Loc: Valley of the Sun

Offline
Depends on the diameter of your pilot, it needs to turn freely inside the case ?neck?. I usually size mine first.


.

Top
#207116 - 06/10/20 06:23 PM Re: Case trimming question [Re: Carpe Diem]
ivoryhunter
stranger


Registered: 02/26/19
Posts: 14
Loc: NJ

Offline
My Lyman trimmer instructions say that pilots are based on properly sized case.

Top
#207122 - 06/11/20 10:01 PM Re: Case trimming question [Re: ivoryhunter]
wheelguns
old hand


Registered: 06/29/08
Posts: 760
Loc: Western Montana

Offline
I trim mine before sizing,otherwise they are a little to tight in my RCBS case trimmer. Sizing dies are all just a bit different in size. The difference between my 454 hornady die and my 454 RCBC die is considerably. The RCBC die being tighter, and about 60 fps faster over the hornady die loaded with same bullets and powder. I guess what I'm saying is there are many variables, and the only why to know for sure is try it both ways.

Top
#207128 - 06/12/20 02:27 PM Re: Case trimming question [Re: wheelguns]
98Redline
old hand


Registered: 10/10/10
Posts: 724
Loc: Eastern PA

Offline
I cut all of my 500 S&W cases to JRH length before I sized them.

As long as you are consistent in your process it doesn't really matter if your cases are .002" shorter or longer than the spec. That isn't going to change the internal case volume to any appreciable degree as to impact the powder burn.

What will be impacted is the crimp. If your cases are .002 short but they are ALL .002 short, the crimp consistency will be there. If the case lengths vary between say +.001 to -.002 then the crimps will vary and you will likely see performance/accuracy differences between the long and short cases.

As an example, look what Hornady does with their Leverolution ammo. The straight wall cases on those rounds are notably shorter than spec, but they perform well because all rounds are crimped the same.

Top
Page 1 of 1 1


Moderator:  Chance Weldon, Gregg Richter, Gary 
Hop to:
 Portal Sidebar
Who's Online
2 registered (Billc, Mark Hampton) and 44 anonymous users online.
Top Posters
9836
Whitworth
9608
s4s4u
9537
jamesfromjersey
7645
wapitirod
7327
TCTex.
6812
KRal
5284
Ernie
5057
Gary
4704
Tigger
4647
Franchise
4461
pab1
4440
Chance Weldon
4370
Dan B.
4132
Gregg Richter
3755
johnwilliams
  Member Hunts
Long Range Ram
Long Range Ram

Maine bobcat
Maine bobcat

   Access Requires Login

Generated in 0.04 seconds in which 0.01 seconds were spent on a total of 14 queries. Zlib compression enabled.




Copyright © 2000-2008
HandgunHunt.com, Inc.