300gr 45 ACP Lading

[Johann Marais]

Naandsê,

Het enige een van julle 45 ACP herlaaiers al ooit Frontier se 300gr 454 Casul punt gelaai in sy 45 ACP?

Ek hou daarvan om met swaar punte te skiet en ek sal graag wil weet of dit sal kan werk.

[tripodmvr]

Hierdie deur Google gekry. Dui op moontlike faktore wat oorweeg moet word.

http://castboolits.gunloads.com/showthread.php?t=8080
This is a link to the molds and maintenance section for heavy 45 acp stuff.
I measured a bunch of cases and started seating flat base bullets deaper into the case to see how far you could go and still have it chamber.(which meant how far can the base of the bullet go into the case)

anyway, I took a few 230 BD acps and seated them deap in increments until I started getting a bulge, then measured it to get an idea of what base deapth would still funtion in a 45 acp.
I have a Star PD, AMT Longslide hardballer and M-98 16" barrel to test in.
I tried some WW, R-P and TZZ 87 and 93 cases.
I thought the TZZ Israeli military cases would be the worst as they have the least case capacity. They ended up being the best for deap seating a bullet.
The 230 BD acp is .6" long with a square base. The cases are .9" ish
The chamber on my Star PD is about .478" ID, the M-98 is .477", I didn't take the AMT down to measure it.

So with the TZZ 87 cases I can have the base of the bullet about .510" in the case and still have it chamber.
Next thought, existing 45 bullet molds with a gas check. Now I can just measure to the bottom of the bottom drive band?
I have the Lee C452-300 RF that is .763" long and .65" to the bottom of the drive band. When seated to 1.225 OAL it would just fit in the magazine. Almost to the top crimp groove. Next I'll have to see how it shoots without a gascheck?
I also have a MM 340gn 90% nose that is .833" long and .730" to the bottom drive band. When seated to 1.19" it will fit the magazine and feed fine.

Now I'll have to spend some time with quickload and order a heavier recoil spring for the AMT. I don't think I'll even try pushing the Star PD with the aluminum frame and all.

Now a question about slide recoil momentum. Should we use momentum or energy? I'm thinking momentum.
For every action there is a reaction...
factory 45 acp = 230@855 = 196650(grain*feet/second) GFS (what a strange unit)
Other loads available look like 185*1140 = 210900 GFS
230*875 = 201250 GFS, Looks like similar numbers.
so M1*V1 = M2*V2 (almost) to take the units out of it. M1*V1/M2 = V2 ?
Should V2(velocity) be a safe slide velocity to not damage the gun? If so, then...
230*875/310 = 649 fps. Can we safely shoot a 310 grain bullet at 649 fps out of a stock 45 acp and not damage the gun?(assumeing the pressure is safe)

Now we put in heavier recoil springs, like for the 45-08 with a 200 SWC at 1300 (260000 GFS)with a 25(22?) lb recoil spring. 200*1300/310 = 839 fps?

A 310 grain bullet at almost factory velocity sounds pretty good to me. (With only the change of the recoil spring, and maybe some recoil buffers).

[alecjohnson]

sal 'n awesome hard slaende subsoniese rondte maak!!!!

[Johann Marais]

Dankie Tripod, wat sal soñ rondte se lading wees?

[tripodmvr]

Ek het na MP200, S221 & S265 gekyk op QL.

S221 = 5gr vir 770vps
MP200 = 3,5gr vir 743vps
S265 = 7,5gr vir 700vps - dop is 100% vol

TPL is 32,4mm = 1,275dm vir al die gevalle bo.

[Johann Marais]

Ek is baie tempted en gaan dit verseker probeer. Ek skiet met 147gr op my CZ 75 met groot
Sal lekker wees om te sien of hierdie lading dieselfde werk.

[tripodmvr]

Ek sou aanbeveel dat jy Google gebruik en kyk na ander manne wat dit al gedoen het. Weens die groot traagheid van die 300gr koeel moet die lading baie versigtig benader word - my QL berekeninge kan moontlik baie uit wees en wees dus versigtig. Alvorens jy nie werklike spoed aan 'n lading kan koppel nie is QL se syfers teoreties - ek het wel probeer om nie 800vps te oorskry nie. Die oorsese manne het baie dryfmiddels om uit te kies.

Die 2de probleem is die vorm van die koeel wat die dop agter laat uitswel en dan wil dit nie kamer nie. Die swaarste koeel vir ACP is gewoonlik 260/265 - Lee se handleiding kom net tot by 260gr. Magasynlengte is wat ek as TPL gebruik het.

[Johann Marais]

Baie dankie, Tripod, dit is baie goeie raad.