Loading manuals indicate the max length for 7mm RUM brass should be 2.840". I always run new brass (Rem. of course) through my sizer die & check the length. I find that some are shorter than 2.840" & could be anything from 2.837" on up. Is this a problem & can it affect accuracy :?:
New Brass Length
- Thread starter bobbyrum
- Start date
- Nov 4, 2004
- 25,494
- 9,394
Consistancy is always a key ingredient for accuracy.
I would trim all your cases to the min 2.830" and start from there.
It may not actually have much, if any, effect on accuracy but it sure would make me feel better knowing that the cases are all the same length.
JD338
I would trim all your cases to the min 2.830" and start from there.
It may not actually have much, if any, effect on accuracy but it sure would make me feel better knowing that the cases are all the same length.
JD338
Richracer1
Handloader
- May 12, 2005
- 2,141
- 121
bobbyrum":yyuirh34 said:
This is interesting, the Nosler #6 shows 2.850 for max, but Hodgdon's 2008 manual indicates 2.840 for the max. Anyway, I went with the Nosler data, but since I use the RCBS X F/L die, I trimmed .020 (per the RCBS instructions) for a 2.830 case length.
- Thread starter
- #5
I had a brain fart, I guess :roll: I meant trim length is 2.840, not max length.I would'nt worry about it.
Some one here may feel different about it, but I try to trim my brass to the same length.
I sometimes end up trimming a couple a little to short before I get my trimmer set just right. Never caused a noticable difference in acuracy.
I am talking a couple of thousadths here and I supose If I were shooting in a match I would pay more atention to it.
But for game hunting I think its not worth worying about.
Why not put a mark on the primer on the short ones so you will know when you shoot ones witch ones they are , then you will know.
You might even find your individual rifle likes that length better.
...tj3006
Some one here may feel different about it, but I try to trim my brass to the same length.
I sometimes end up trimming a couple a little to short before I get my trimmer set just right. Never caused a noticable difference in acuracy.
I am talking a couple of thousadths here and I supose If I were shooting in a match I would pay more atention to it.
But for game hunting I think its not worth worying about.
Why not put a mark on the primer on the short ones so you will know when you shoot ones witch ones they are , then you will know.
You might even find your individual rifle likes that length better.
...tj3006
- Thread starter
- #7
