Sizing tolerances.

Message

#1 Post by **ruger_steve** » Fri Jun 22, 2018 7:44 am

I have just bought a 308 RPR rifle and A reloading kit made by Lyman.

I have been looking in the Lymans 49th edition and it’s labelling the .308 as something like 2.015 long without the head, but my once fired brass, after resizing is showing as 2.008.

I just wanted to know what the tolerances are in relation to these books and the brass?

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#2 Post by **dromia** » Fri Jun 22, 2018 7:54 am

Why would you remove the base of the cartridge?

#3 Post by **1066** » Fri Jun 22, 2018 8:09 am

Hello Steve - and welcome to the forum..

2.015 is the maximum length, at 2.008" you will be fine. I would reload and shoot them all again, they may grow a couple of thou, then trim the whole batch to the shortest one to get them all equal.

OAL, although listed as 2.8 (case and seated bullet) tends to be a bit fluid.

#4 Post by **ruger_steve** » Fri Jun 22, 2018 9:30 am

Excellent thank you. I was a little worried as I read somewhere (still new to this. Very new) that rounds can be slightly longer, but never shorter. However this was talking about how much the head was inserted into the cartridge because of the amount of extra pressure

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#5 Post by **dromia** » Fri Jun 22, 2018 9:33 am

ruger_steve wrote:However this was talking about how much the head was inserted into the cartridge because of the amount of extra pressure

??????????

#6 Post by **bradaz11** » Fri Jun 22, 2018 9:36 am

what I think when I hear bullets being called heads

#7 Post by **ruger_steve** » Fri Jun 22, 2018 9:43 am

bradaz11 wrote:what I think when I hear bullets being called heads

Lol. What else would you call them? I say the whole thing is a cartridge. Separately is casing and bullet head.

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#8 Post by **ruger_steve** » Fri Jun 22, 2018 9:43 am

dromia wrote:
ruger_steve wrote:However this was talking about how much the head was inserted into the cartridge because of the amount of extra pressure

??????????

Talking about reloading. The further you insert the bullet head the less room between the powder and the head meaning higher pressure when ignited. The more room the less pressure.

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#9 Post by **dromia** » Fri Jun 22, 2018 9:47 am

The head is the bottom of the case, the bullet is the bullet. Which part of the bullet is the bullet head?

If you are serious about reloading and wish to be a responsible and safe handloader then it is incumbent upon you to learn the correct nomenclature to avoid confusion, mistakes and potentially dangerous situations.

#10 Post by **ruger_steve** » Fri Jun 22, 2018 11:28 am

Are you serious? Everything I have read has referred to the projectile as the head or bullet head including the RFD’s selling then. I don’t think anyone (barring you) would not know that I was referring to the little bit that comes out of the tube part of the gun and whizzes through the air. I understand the need to be precise with this but come on, that is splitting hits a little isn’t it?

If I called a shop and asked to buy some bullet heads, what do you think they’d send me?

As I say, nothing I have read has referred to the ‘head’ as the cartridge or bottom so you must forgive me for not communicated that way.

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