Brass trimmed too short for my 7.65 x 53 ?

[mrappe]

I have converted some 30-06 brass to 7.65 Mauser for my 91 Argentine using an RCBS case forming die. After running them through a Lee full length sizing die I trimmed them with my RCBS Trim Pro to the trim to length that I found in a Hornday book of 2.08" but some how the last 2 or three some how came out as 2.07" and I have one that is 2.05" from when I was trying to set up the trimmer. How short is too short? I am not sure what the last 2 came out different other than the trimming stop rings slipped a little under pressure.

Thanks

[Snyper]

It won't hurt anything for them to be short. other than maybe accuracy

[mwells72774]

Mine run about 2.06" and they perform well with cast

[Pathfinder45]

Hmmmm, so your trimmer got loose and trimmed a few cases .020 to .030 short, right? Well of course you want to fix that. As to the few short cases, you can either throw them in the trash, or use them and forget about it. I'm still using some 30-'06 cases in my 270 Winchester and they're about .046" shorter than 270 cases. I've done it a lot. You should be fine if you are not crimping your ammo.

[F. Guffey]

I have converted some 30-06 brass to 7.65 Mauser for my 91 Argentine using an RCBS case forming die.

marappe, You used a RCBS forming die, then you used a full length Lee sizing die and 'THEN!' you trimmed.

FIRST, I measure the length of the forming die, then I add .125" to the length of the die. Not strange to me but I do not have a tool that is more accurate when trimming cases than the forming die. There is a difference in methods and techniques exercised by me than other reloaders. I measure the length of the case after forming, I measure the length of the case after sizing. There can be a difference because I off set the length of the chamber from the shoulder to the bolt face with the length of the case when measured from the shoulder to the case head.

Forming cases: I have formed 30 Gibbs from 30/06 cases. The neck of the 30 Gibbs is .217 long, that is short. After forming and firing the cases shorten .035"+.

I off set the length of the case with 280 Remington cases, the 280 Remington cases is .047" longer than the 30/06 and the shoulder is forward the 30/06 by .051" meaning I add .030" to the length of the case, longer neck with more bullet hold.

F. Guffey

Difference In methods and techniques, I want to cover as much of the chamber with the case as possible. I believe short cases are a bad habit. When forming 7.65 B.M. cases how can someone miss with the case length from the shoulder to the case head and from the end of the neck to the case head?