The firearm thread

[Indiana_Jones]

Was planning of turning up around 11ish myself

-Indy

[The Pastor]

Just loaded 97 rounds, way to easy now.

One case wasnt sized? kinda weird lol. ran out of powder for the last 3 cases, so annoying!

I have 50 flat nose and 47 flex tips rounds loaded at 40gr. Good thing i didnt go at max.

But i still want to know what will happen pressure wise with the same loading but a 10gr heavier bullet. More or less pressure?

Got the powder measure thrower thing hooked up, saved A LOT of time, real quick to reload now. Really crappy design for bolting the stand on tho, really bad.

Saturday here we come!

[ManDownUnder]

But i still want to know what will happen pressure wise with the same loading but a 10gr heavier bullet. More or less pressure?

MORE

Think of it as throwing a ball as hard as you can. Are you more likely to over exert yourself thowing a light one - or heavy one? The big pills take more push to get them going

[The Pastor]

MORE

Think of it as throwing a ball as hard as you can. Are you more likely to over exert yourself thowing a light one - or heavy one? The big pills take more push to get them going

how much more?

[Wolf]

Just spoke with shiny side up: unless something really horrific happens he'll be there - wants to know if it's cool to bring along two of his next generation of hoplophiles and what (aside from a goodly number of firearms and ammunition) he needs to bring.

If all goes well and he can make it, then so can I as I'll be catching a ride with him.

[Mr Merde]

Just spoke with shiny side up: unless something really horrific happens he'll be there - wants to know if it's cool to bring along two of his next generation of hoplophiles and what (aside from a goodly number of firearms and ammunition) he needs to bring.

If all goes well and he can make it, then so can I as I'll be catching a ride with him.

Bring him along and the next generation.

Looks like we are going to have a good day judging by the number of people comming.

[jono035]

how much more?

The main rule with smokeless is that the hotter it is, the faster it burns. As pressure rises, so does temperature, therefore a round developing more pressure burns faster, producing more pressure so it burns faster etc.

This is a surprisingly delicate balancing act where a little extra powder or extra bullet weight (or extra crimp pressure etc.) can really spike pressures quite quickly.

I'll get some numbers from QuickLoad and see what I can see.

[The Pastor]

Bring him along and the next generation.

Looks like we are going to have a good day judging by the number of people comming.

yeah looks like a few are coming, what about jrandom?

[Indiana_Jones]

Sounds like it's gonna be a turn out and a half

-Indy

[Mr Merde]

yeah looks like a few are coming, what about jrandom?

Havent heard from him at all.

[jono035]

From playing with QuickLoad using the .308 Winchester as a parent case (they don't have .308 marlin in this version):

AR2206 with Speer SP2023 bullet seated 4.4mm into the case
41.5grains under a 150gr bullet = 2600fps, pmax of 45k psi
41.5grains under a 160gr bullet = 2550fps, pmax of 47k psi

Add an extra 2mm seating depth and you get 49k.

That's much less of a difference than what I would have expected, I guess rifle cases must be a little less sensitive to these kinds of changes... There are a lot of other factors that can affect this, though, that would only be found by slowly working up. Different bearing surfaces, jacket hardness/thickness, core hardness, overall diameter, seating depth and crimp pressure of the bullet could all affect internal pressures.

Doesn't sound like the type of change that will blow up your gun, to be sure, but it could still stretch the locking lugs or separate the case head.

[ManDownUnder]

how much more?

Dunno but as usual - a number of factors come into play... crimped/not cruimped, bullet seating depth, charge, powder type, primer type... the usual long list of suspects...

[Wolf]

Havent heard from him at all.

I sent him a text but no reply, either.

[Flip]

Took my Brown Bess out rabbit hunting last week. Loaded it with 46 grams of No5 shot over 100 grains of No2 BP with 20mm wads cut from old carpet. Went for a walk got 6 and completely missed 3. Tended to shoot high and the lock time was a bit of a issue. I was however very happy with the results.

On another topic, the Alexander easter bunny hunt, well we are in. Team BASTARD (Bunny Assignation Squad Targeting All Rabbits Dead) is going south again. Have a work property set up for a couple of nights practice on the way.

This was some vid from last years hunt, we went wobblie hunting on the way back.

http://www.youtube.com/watch?v=Y5UW9VMwb50

[Mr Merde]

Took my Brown Bess out rabbit hunting last week. Loaded it with 46 grams of shot over 100 grains of No2 with wads cut from old carpet. Went for a walk got 6and completely missed 3. Tended to shoot high and the lock time was a bit of a new problem to me. I was very happy with the results.

Claasic hunting, sweet.

I went out for a day, with my 45-70 Trapdoor loaded with BP, but unfortunately never got the opportunity to take a shot.

Yep the lock time on these older guns bring something else into the equation.