Garand Component Questions ( J word loading)

[FLINTNFIRE]

Relative to commercial cases vs GI cases there is an issue of volume.
Of course it depends on the source of the brass.
US GI cases made say prior to 1960 generally have thicker walls then is the case with commercial cases. Thicker cases can remove more calories from a hot chamber than thinner cases. MY guess is the thicker cases were designed with the BAR and Browning machine guns in mind, but that is only a guess on my part.
I found out the hard way in a P17 bolt action gun that using loads developed for commercial cases in GI cases resulted in loose primer pockets. The GI brass may also be softer. The loads with IMR 4895 if remember do not fill the case and maybe there is less of an issue between GI and commercial case. As others have mentioned the port pressures developed by imr4895 are consider ideal for the Garand when using GI Spec parts in the gas system.

I have weighed some of my military brass and some of the commercial stuff was actually heavier , volume tests are good to do when approaching higher end loads .

And yes I had always heard military brass reduce loads , but there is differences even in different lots and brands of commercial , I try to lean to the lower side and stay safe .

Had a 17 Remington all original , was a favorite , had a coworker try to give me a 17 Winchester with a Johnson automatics barrel , I passed as he was the kind you then owed something to .

I ream the crimp out with a Lyman spinner mounted on the side of bench , use a Lee APP and deprime then ream then tumble wash and size , have a fondness for the M1 , shoot in the range CMP matches when I can .

Doing 2500 cases is going to be a lot , and the en blocs are getting more expensive , as is everything though .

[MakeMineA10mm]

MakeMineA10mm,

Your post makes me feel better about the Garand loading. I have 8 lbs. of IMR4895 coming from Midway. Their 1lb. container is on sale (I can get 8 1lb. containers for less than their 8 lb. container....go figure).

After I get that loaded I plan to order some AA2520 & use it with my WLRM primers. Your post gave me that confidence.

I'm fortunate in that my two sons grew up learning to reload with me. Also, I'm in no hurry. When I get tired, I quit & continue the next day (my Gracy Match Prep helps). Also, I have a very understanding wife: she's stuck with me through hunting, fishing, MX racing, hare scrambles ( now called GNCC), reloading, casting, IPSC, IHMSA, XTC & all of the CMP disciplines.

Many thanks!
Henry

That’s awesome, Henry! Glad I helped some. Be sure and take a picture for us of all the pretty ammo!