New here/ reloading about 9mm

What is everyone’s take on trimming 9mm brass? The books all have different minimums. I know the different lengths can cause a pressure difference.
 
TG is fast and highly energetic. It's abundant and popular - not sure which is the cause, and which is the effect there. It's also economical - I guess that's important to some loaders. To me, the propellant is the least expensive of the components and thus, isn't hardly a factor.

TG is at its best making your basic plated range shooters for most calibers. If you're loading to punch a bunch o' holes in paper at the range, then TiteGroup an ideal propellant.

It makes accurate low recoil loads for USPSA. It isn't case position sensitive nor is as temperature sensitive as W231. It is also results in large powder charges (compared to weight) that make double charges very easy to spot even with the small powder charges used. Price isn't a huge concern, but availability is which is why I never tried N320 because it isn't available enough.

I use a Gem Pro scale, it is a reasonably priced scale. I always turn off all fans and the AC when I use it as it is sensitive enough that those will cause it to fluctuate. It actually drove me batty until it was cool enough that I didn't have them on, and I noticed it was rock steady.

Trimming 9mm brass, I don't bother.
 
It (TiteGroup) makes accurate low recoil loads for USPSA.

That comes as no surprise to me. Recoil is indeed light with TG.

It (TiteGroup) isn't case position sensitive nor is as temperature sensitive as W231.

Hodgdon advertises TG as not being position sensitive. I've run some tests with it using 38 Special (large case volume) and light loads (low propellant volume). Result: there is some position sensitivity. But my tests represented pretty much an extreme scenario; so I won't make the claim that they are incorrect. I'm just saying that I have been able to produce some position sensitivity. To be fair, I have achieved some very consistent chronograph results using TiteGroup.

As for W231 being temperature sensitive, I have heard that. But I have not noticed it personally. Over the years, I have run my pet 45 ACP 200LSWC 5.0gn W231 loading over a chronograph countless times. I've done this at all times of the year. Nothing has raised any eyebrows. They run right around 840 f/s every time I check them.
 
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