paper weight/thickness?

[BRUCE MOULDS]

i have found some 85gm/square metre rag paper.
how does this relate to how we think of paper in lbs.
i know toat lb wt paper can vary in thickness, but how thick might the 85 gm paper be?
keep safe,
bruce.

[sharpsguy]

The easy way to find out is to take a dial caliper to the store with you and measure a sheet. I've done it a number of times. You can't tell by just looking.

[BRUCE MOULDS]

yes that is what i would do if it was not in china.
just wondered how that method of describing paper weight relates to the old method.
keep safe,
bruce.

[Gunlaker]

Bruce, I just did some "googling" on paper weight conversions. There are a bunch of charts available if you look for "paper weight conversion". It looks like that paper is a little heavier than what we usually use. Maybe the equivalent of 20 lb paper. The gsm just stands for grams per square metre I think.

Chris.

[beltfed]

85 gsm /1.48 =57.43 lb/ream (US/UK papermakers unit of weight per unit area== Ream is 500 sheets of 17x22".
Very Heavy, thick paper. Not at all
suitable for PPing
Typical writing paper is 16 #/rm to 20 or so.
My paper is 7,8, 9 #/rm for PPing. -thickness at 0.00150 for the 7#
etc
beltfed/arnie

[martinibelgian]

Bloody heavy stuff - you want something in the order of 50 grams/sqm, no more. 90 grams is pretty heavy printer paper.

[BRUCE MOULDS]

thanks guys.
you just saved me a lot of money.
keep safe,
bruce.

[beltfed]

Kind of like card stock for making wads
beltfed/arnie

[BRUCE MOULDS]

might have discovered the best wad material ever?
keep safe,
bruce.

[rfd]

i would never trust anything less than using a sample sheet to test out with my own ppb's. anything less is a gamble of sorts because you know how critical .0001" can be with patching paper and the final bullet diameter and fit to the bore. if no sample sheet, it's gambling guesstimate at best.

[BRUCE MOULDS]

rfd,
if the paper is 1/2 decent and you can get a lot of it, best thing is do that and then get a mould to suit.
worth the money.
the paper above can be purchased by the metric tonne!
it is 3/4 cotton, 1/4 linen.
pity it is not about 0.0015 thick.
keep safe,
bruce.

[rfd]

considering the price of a GOOD mould and the comparable silly cheap cost of paper, no thanx ... i'll fit the paper to the ppb.

[Dan Cash]

i have found some 85gm/square metre rag paper.
how does this relate to how we think of paper in lbs.
i know toat lb wt paper can vary in thickness, but how thick might the 85 gm paper be?
keep safe,
bruce.

Bruce, I have some 40 gram per square meter paper in my hand which mikes .002. I would guess the 85g paper might be .004 though it culd be denser and not thicker to gain the weight.

[beltfed]

PLease note that the Basis Weight of paper -as in XX grams/sq m. or #/ream
ONLY refers to the Weight per unit area, NOT the thickness.
Thickness factor is also influenced by how dense the paper has been made by
Calendering (pressing) it as it is made and whether Super Calendered in a subsequent step.
So, you Need to know the caliper/measured thickness to help determine its
use to us
beltfed/arnie

[country gent]

Just as a point of information for measuring paper thickness good michrometers would be better than calipers. Better still would be one of the large anvil Starret mikes for paper and compressable materials. Also a height stand and dial indicator would work well. The stand and indicator would allow measurements at the edge to almost the center of a 8 x 11 1/2 sheet. When measuring you don't want to include the very edge of the paper in the measurement as it may be deformed burred from cutting

[Lead pot]

You also cant go much by # either. I have some 7.5# that is thicker then 9#. It all depends how much seizing they have in it to keep ink from bleeding through or translucent

[beltfed]

Papermaking 101:
The opacifier /ink holdout additives are what we do NOT want
in our PP paper. These include silicon dioxide, titanium dioxide, etc.
That is unless you want to be firelapping/polishing your bore.
These additives have little to do with how thick the paper will be.
Same with sizing additives.
We want thin, dense strong paper that is relatively additive free.
Such as tracing paper, and similar.
Caliper/thickness is mostly governed/whatever the weight, by how much the paper is
pressed(in papermaking jargon: calendaring) thru high pressure rollers.

[BRUCE MOULDS]

and the more those rollers have compressed the paper, the less the bullet has to bump up when you light the fire.
the other issue with barrel life is how you wipe.
keep safe,
bruce.

[Leeroy151]

i use printer paper adhesive labels and they seems to be 0.009 per each wrap around. I think I would use cigarette rolling paper if i wanted something thinner. Maybe some sugar water to make it stick.

[Lead pot]

Scott tissue toilet paper is good. No joke :) I have a undersized bullet I needed to get up to bore diameter and I needed to use a triple wrap to get it there with the paper I use so I measured the scott paper and a double wrap adds a little over .010" compressed. Just cut it with the grain (as it runs off the roll) and it works very good for patching.

[BRUCE MOULDS]

and you can save moey by using recycled.
bet money noone thought of that but ere too decent to say it!
keep safe,
bruce.