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Shooting & Reloading - Mausers, Big Bores and others >> Cast Bullets

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gungadoug
.333 member

Reged: 13/08/12
Posts: 285
Loc: NM

Help! Cast in DR regulation
#219759 - 18/11/12 01:15 AM

I have a Simson double in 405 Win, which does very well with Jacketed bullets. Would like to shoot cast due to price, etc. I have some nice 265 gr. Keith style, which will go just as fast as the jacketed without leading, However at 50 they are 2' apart! I have to DROP the velocity to get them to start to come together, and by the time I get close to regulation, the cases won't seal, and velocity is unusable. I'm kinda confused! Any help would be appreciated!
Thanks, Doug

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Idahoshooter
.275 member

Reged: 27/10/12
Posts: 64
Loc: Idaho, USA

Re: Help! Cast in DR regulation [Re: gungadoug]
#219764 - 18/11/12 04:01 AM

Doug,
If it were my rifle and I wanted to use that specific bullet, I would try different powder. I'd start with Trail Boss and work my way to the slower powders. If that didn't work then I'd try a heavier bullet. In my 45/70 double, changing powder makes a big difference in where the loads print, even with loads producing the same velocity.

Greg

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gungadoug
.333 member

Reged: 13/08/12
Posts: 285
Loc: NM

Re: Help! Cast in DR regulation [Re: Idahoshooter]
#219783 - 19/11/12 12:21 AM

Yeah, I've tried several powders, fro the standard cast bullet to h4895, but all print apart! Maybe the weight is the issue after all. I feel like the "stay time" in the bore is much less than jacketed, and this may be the trouble. Really confused about having to reduce velocity to bring together however!
Doug

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Mauser416
.300 member

Reged: 20/06/07
Posts: 162
Loc: Corpus Christi, Texas

Re: Help! Cast in DR regulation [Re: gungadoug]
#230122 - 16/05/13 03:23 AM

What was your regulating load? Folks have reported very good success with the 75% rule.

Start with your regulating load and use the same powder charge but drop the bullet to 75% i.e. if regulated with 60 gr. of RL-15 and 400 gr. bullet use 60 gr. of RL-15 and a 300 gr. bullet.

You can also use the same bullet weight but reduce the powder charge down to 75% so in the case above it would be a400 gr. bullet with 45 gr. of RL-15.

For some folks the 75% rule has been spot on and for some it has required a little bit of fine tuning.

Eric

--------------------
There is nothing worse in this world than an enslaved man who naively believes himself free, except, perhaps, trying to explain to that same man his predicament.

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aromakr
.375 member

Reged: 20/04/11
Posts: 849
Loc: Hamilton, Montana

Re: Help! Cast in DR regulation [Re: Mauser416]
#230342 - 22/05/13 04:28 AM

Doug:
Bullet weight and diameter will certainly effect regulation. I would find a mold that is the same weight as your jacketed bullet and .001-.002 larger than groove dia. Plus the ogive/nose shape should be similar. i.e. if it regulates with a round nose, it probably will not with a spitzer.
Bob

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AkMike
.416 member

Reged: 19/11/05
Posts: 2576
Loc: Anchorage, Alaska

Re: Help! Cast in DR regulation [Re: aromakr]
#230451 - 24/05/13 02:23 PM

Have you tried 5744 powder?

If you decide to go with a mold I highly recommend Tom at accuratemolds.com.

If it's not shown he'll build it and he's very fast compared to others.

--------------------
"When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand

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DarylS
.700 member

Reged: 10/08/05
Posts: 26994
Loc: Beautiful British Columbia, Ca...

Re: Help! Cast in DR regulation [Re: AkMike]
#230462 - 25/05/13 12:24 AM

Trail Boss, or are you looking for 'some' power too?

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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