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DDouble
.300 member


Reged: 17/02/06
Posts: 127
Loc: Brazil
help in reloading the 470 with unknown powder
      #138557 - 06/07/09 11:16 PM

Poste this elsewhere, but I do need help with .470 reloading. I am in south america and cannot bring powder and primers into the country easily (a major understatement)

I have a few old Remington 91/2M primers and a single base powder CBC (magtech). This is their slowest burning powder and is called CBC 124 used in 300wm and 7mRM.

Today I tried a few 500 grains woodleights throug my cronograph:

90 grains +12 grains filler = 1747 fps

95 grains +10 grains filler = 1801 fps

Federal factory = 2049 fps


Question 1: is this remington primer much worse than the 215?? So that I will never get good results??

Question 2: was 50 fps to little for a 5 grain increase in powder? Is this powder no good?

Question 3: as I increase the charge, how much can I compress the powder?

--------------------
Ddouble

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bwananelson
.400 member


Reged: 08/10/07
Posts: 1195
Loc: DELTONA FLORIDA
Re: help in reloading the 470 with unknown powder [Re: DDouble]
      #138559 - 07/07/09 12:32 AM

are you using a filler or does this powder max the case

--------------------
THERE ARE NO DO OVERS IN LIFE DONT LET A CHANCE AT A DREAM SLIP AWAY.

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DarylS
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Reged: 10/08/05
Posts: 26873
Loc: Beautiful British Columbia, Ca...
Re: help in reloading the 470 with unknown powder [Re: DDouble]
      #138560 - 07/07/09 12:33 AM

In a case that size, I'd think 50fps is about right with the slow rifle powder with light to moderate loads.

A powder used in the magnum cases noted, is probably very slow and might not give you full velocity. It is probably similar to 4350, 4831 or 7828.

Most slow rifle powders can take compression in stride, work better when and a full case to a compressed load might be necessary to obtain factory ballistics.

I do not load for a .470, but have 'some' experience loading ctg.s that have no data - similar circumstance to yours. You are lucky in having factory ammo for cross-referencing.

Measure a factory case at the web(about 3/8" above the rim) to see what the expansion is. Use a mic, not callipers if possible) You can load to that expansion in once fired brass. Go slow, perhaps 2 to 3 gr. increase at a time.

The Rem 9 1/2 mag primers should be just fine, although a longer burn as given by the Fed 215 is generally prerred. Also, since you have a chronograph and knowledge of loading, you will probably have no problems with obtaining good results. Shot to shot consistancy will show whether or not the primers are up to the task of igniting the charges. the shot to shot consitancy should improve with the more powder you use, as well, compression, if loading will permit, will help the powder burn properly. Beware that too much compression can make the bullets move forward (spring-back) from their seat in the case - something to watch for.

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


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

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DDouble
.300 member


Reged: 17/02/06
Posts: 127
Loc: Brazil
Re: help in reloading the 470 with unknown powder [Re: DarylS]
      #138615 - 07/07/09 09:41 PM

Thanks a lot for inputs. Daryl thanks for reassuring me about the primers. It seems everybody else uses 215s.

I will increase the charge slowly and check speed and pressure signs.

The powder is not filling the case at 95 grains. I belive that will happen at about 105 grains.

I may try another unkown poeder (CBC 126) which is supposed to be a little faster. I used this one because all the 470 people (like Searcy) uses 4831.

--------------------
Ddouble

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bwananelson
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Reged: 08/10/07
Posts: 1195
Loc: DELTONA FLORIDA
Re: help in reloading the 470 with unknown powder [Re: DDouble]
      #138647 - 08/07/09 10:50 AM

what speed is your gun regulated,a double right.use your graph you probably wont see signs of pressure from what i have been taught here speed needs to be monitored and a good manuelcemail the powder factory thet will help

--------------------
THERE ARE NO DO OVERS IN LIFE DONT LET A CHANCE AT A DREAM SLIP AWAY.

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