I was planing on using Dillon dies
Regardless of die, I highly recommend setting up your die with case gages. You do not want a case that is too long.
This ledge is the difference between Go and No Go. Seldom will you ever size your cases to the correct length by the hit and miss method of sizing to the shell holder plus a quarter turn. You need gages to measure shoulder set back.
I recommend small base dies for these rifles for following reason: you do not want a long case or a
fat case to delay bolt closure. It is positively risky in these actions.
At this location the firing pin is touching the receiver bridge and is fully forward. If the bolt has to stop to crunch fit a fat case or a long case, that free floating firing pin is just wacking the heck out of the primer and yet, the lugs are not engaged. This is where out of battery slamfires occur in this rifle.
You can see the receiver bridge and firing pin in these pictures. The primary function of the receiver bridge is to cam the firing pin back during extraction and hold the back of the bolt up. It is very ineffective in preventing the firing pin from rebounding off the primer during feed as it is only retracted during cam down.
This pencil mark is the location at which the firing pin is free to go all the way forward. Given a sensitive primer, your rifle can slamfire here. If your rifle slamfires here, at least there is some lug engagement, but the lugs are not fully seated and engaged so it is possible there would be damage to the lug or receiver seats.
Long and/or fat cases just increase the potential for in and out of battery slamfires. Therefore, make sure your cases are smaller than the chamber.
Here is some of my chronograph data of 150’s and my load. I don’t know why, but my load clocks faster in my SAKO than a Garand, maybe the barrel is tighter.
Code:
[SIZE="3"]M1 Garand Douglas Barrel 1:10 twist
150 gr FMJBT 1966 Ball
14 Nov 2011 T= 74 ° F
Ave Vel = 2545
Std Dev = 20
ES = 68
Low = 2513
High = 2581
N = 8
M1 Garand 5 9XX, XXX
150 gr Sierra Match HPBT 47.5 IMR 4895 CCI#34 190 ≤ WWII ≤ 195 OAL 3.29”
24 Mar 04 T= 70 ° F
Ave Vel = 2630
Std Dev = 33
ES = 109
Low = 2580
High = 2689
SAKO 24" Barrel
150 gr Sierra Match HPBT 47.5 IMR 4895 CCI#34 190 ≤ WWII ≤ 195 OAL 3.290"
17-Aug-06 T = 85 °F
Ave Vel = 2703
Std Dev = 26.41
ES = 80.66
High = 2739
Low = 2659
N = 10[/SIZE]