Has anyon done this....

[giz189]

Had a brain fart awhile back. Looked in loading manual to get "trim to" length for 41 mag. Found it, then while setting up trimmer, I subtracted .010 from this figure. Now I have about 100 41 mag cases that measure about 1.275". Is there a problem with the short cases o do I just need to shoot them till they stretch back out?

[Adam10mm]

Why are you trimming pistol brass? It's a waste of time. Load and shoot.

[giz189]

Why are you trimming pistol brass? It's a waste of time. Load and shoot.I like for the end of the case to end up in the crimp grove each time.

[deltaenterprizes]

.010 is not that big a deal as long as you are not loading maximum loads.

[sagacious]

No, there is no problem at all with the 1.275" cases. You may wish to keep that batch of cases separated for a while so you can adjust the crimp stength to match.

It's not uncommon to find .010" short cases even in factory ammo.

[giz189]

That was my thinking, I just wanted to see if anyone else thought along those same lines. Thanks for the replies.

[Jim]

One one hundredth of an inch is not going to set you back that far. I would suggest you just don't load them to max capacity.

[stubshaft]

I've done it for the same reason. Basically to insure the same crimp tension. There is no reason not to as long as the cases are rimmed and do not headspace on the case mouth.

[Cadillo]

Trimming cases is desirable on any pistol round that uses a rolled crimp as opposed to a tapered crimp, which is much more forgiving with regard to case length. Consistent roll crimps are dependent upon consistent case length.

Any time I trim rifle cases, I trim them exactly 0.010" less than minimum spec. Some loading manuals actually suggest doing this as it reduces the frequency of required trimming and does no harm.

[R.C. Hatter]

:coffeecom Trimming of cases is necessary, from time to time, especially with respect
to rimmed cases where a roll crimp is used. After several firings, especially with heavy loads, cases will stretch, resulting in non-uniform crimps. Such a condition is not very
conducive to the best ignition and accuracy. I believe that for best possible results, cases should be trimmed periodically.

[454PB]

Did you trim before or after sizing?

I always trim after sizing, since the cases get longer when sized.

[bruce drake]

See, you just wanted to make 41 Special cases!

[AZ-Stew]

10 thousandths is a very small amount. It's about the same as the thickness of 2-1/2 sheets of paper. I wouldn't even bother to change the seat/crimp die setting. The difference in bullet pull will be very slight compared to the remainder of your cases and your bullet seating depth will remain constant. I would keep them as a separate batch, however, just because.

Regards,

Stew

[giz189]

Did you trim before or after sizing?

I always trim after sizing, since the cases get longer when sized.Yeah, I trimmed after sizing. I figured that one out the hard way too. Amazing how those cases grow when you trim and then size them ain't it?:redneck: