Rifle case FL resizing

[LC Tikka]

When FL resizing a Win case and also a Lapua case in the same die, give or take a slight spring back variation, won't the cases be the same size? Disregarding neck thickness. Refer to 284 win rounds.
LC

 

[CatShooter]

When FL resizing a Win case and also a Lapua case in the same die, give or take a slight spring back variation, won't the cases be the same size? Disregarding neck thickness. Refer to 284 win rounds.
LC

Yup... there might be small variations due to differences in anneal/hardness, but for all practical purposes, they will be the same.

 

[nosualc]

When FL resizing a Win case and also a Lapua case in the same die, give or take a slight spring back variation, won't the cases be the same size? Disregarding neck thickness. Refer to 284 win rounds.
LC

Yup... there might be small variations due to differences in anneal/hardness, but for all practical purposes, they will be the same.

Presuming that your sizing die makes contact with both cases in all areas, they should be the same outside dimensions (modula variances in hardness/springback).

Inside dimensions will likely be different.

-nosualc

 

[fguffey]

When FL resizing a Win case and also a Lapua case in the same die, give or take a slight spring back variation, won't the cases be the same size? Disregarding neck thickness. Refer to 284 win rounds.
LC

LC Tikka, In ten words or less,? I would suggest you develop methods and techniques that enable you to measure the length of case before and again after sizing. For free to me, I make tools that measure the length of a case from the shoulder/datum to the head of the case, everyone else choose to purchase the tools, seems the general consensus is no one can drill ‘the perfect datum’, but, for a comparator the case being measured must use the same datum.

Then there is the other part that can not be explained in ten words or less, the case can have resistance to sizing, the press has an ability to overcome resistance to sizing, apple and oranges, I sort cases by head stamps, lots and dates. This method does not eliminate the possibility of having cases that have more and or less resistance to sizing, it does reduce the possibility.

Then there is the other option, the one that enables you to answer your own question. Purchase a feeler gage, Redding sells thickness gages, same thing. When sizing a case and the press is adjusted to full length size and the die is screwed into the press with an additional 1/4 turn of the die measure the gap between the shell holder and bottom of the die before lowering the ram, the gap will, in thousands will indicate the case has more resistance to sizing than the press provided, a hard headed remedy for the problem of increasing the presses to overcome the cases ability to overcome resistance to sizing is ‘crank-er down’ as in add an additional fraction of a turn like an additional 1/4, 1/2, 3/4 or one turn.

Methods and techniques, it should dawn on the reloader there is something wrong when the case becomes that difficult to size, annealing the case is a good alternative to punishing the press.

 

[LC Tikka]

Thanks all. As Win cases are smaller than Lapua in the body. If the FL die pretty much forms either fired case to the same size, when choosing a chamber reamer and clearances why then would I get a reamer to suit one case make or the other if reloading?
The way I see things when reloading is, my die internal size and therefore the FL resized case would be the most important items to consider for a reamer spec. So I intend to get some fired cases off a mate, FL size and measure.
Does this approach make sense? as most people say to get a reamer to suit the chosen new case and do not mention resizing.
You can only fire a new case once!!
LC

 

[amlevin]

In ten words or less,? 8) 8)

When was the last time you even thought less than 10 words on a topic

 

[bigedp51]

In ten words or less,? 8) 8)

When was the last time you even thought less than 10 words on a topic

Or even think about staying on topic, what do fguffey's magic feeler gauges, home made datums, Redding selling thickness gages, etc have to do with American made brass and brass made in Finland?

And fguffey used 317 words that had nothing to do with the topic. :

 

[BoydAllen]

I find that the spring back of cases of the same brand varies considerably with the amount of work hardening. For example, one time when I forgot that I had set my FL die (6PPC, Lapua brass) for a set of cases that had been fired and FL sized a lot, the first case that I sized from a lot of new cases had its shoulder bumped .0035. Both sets of cases had been fired in the same rifle and barrel. The die had been set to bump the "experienced" brass by no more than .001. For that reason if I am sizing and measuring cases to order a closely fitting chamber reamer, I always look for the most heavily used brass that I can find to size and measure, and if more than one brand is to be used in the barrel, I will also opt for the brand that is the springiest. I try to order reamers that are a close fit with sized brass, and have done this for perhaps a half a dozen reamers, for myself and friends.
Added later: I also avoid using cases that have only seen mild loads, much preferring those that have been really hammered for this purpose, to make sure that brass from the chamber that I am ordering a reamer for will be able to be effectively sized if it sees really hot loads. PPC shooters have found that if they shoot hot loads, that a die that works for milder loads will not adequately size cases that have been fired hot. Some have more than one Harrell Precision die to deal with this situation.