Wad swap in RSI load

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Wad swap in RSI load

Postby Rob MacK » Fri Feb 14, 2014 11:01 am

OK to be clear I am not recommending anyone do this this is my own project I am working on just looking for suggestions. Any decision I make is my own responsibility.

That said. I currently use an RSI load with 520 gn shot, Ched 3" hull, 38.0 gn ASteel, RSI wad and CH209.

I am considering a swap to the TPS 2 3/4" wad so I figure a powder decrease is in order. I figure I should go down to at least 34.0 gn of powder if not 33.0 to start.

Opinions please.


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Re: Wad swap in RSI load

Postby solway gunner » Fri Feb 14, 2014 11:33 am

Rob
Is this for an experiment or something? i think if you drop by 4 or 5grains itl be way too much of a drop and itl destroy the whole loading -2grains is more like it in my view- by stating ch209 do you mean cx2000 primer sub?id try it on 36grn straight off.Cheddite hulls are quite a forgiving hull pressure wise compared to rems and seem to shoot tps quite well but can spike quite easily with steel shot and top end loads v the rsi wad,let us know how you fair.
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Re: Wad swap in RSI load

Postby Jon Bergren » Fri Feb 14, 2014 11:39 am

I use VP60 shotcups in place of RSI shotcups also for 3" RSI loads. Ned S
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Re: Wad swap in RSI load

Postby Jim Atlas » Fri Feb 14, 2014 12:38 pm

Do you have any 1-1/4 or 1-1/8 oz MM or TPS data for ched or activ hulls? Might help as a cross reference for gauging your starting point. What's the psi on that load--something like 10k, right?
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Re: Wad swap in RSI load

Postby Rob MacK » Fri Feb 14, 2014 2:03 pm

Jim Atlas wrote:Do you have any 1-1/4 or 1-1/8 oz MM or TPS data for ched or activ hulls? Might help as a cross reference for gauging your starting point. What's the psi on that load--something like 10k, right?


I have some yes. I have to go over them again. I think its 10 k ish I will have to look. BPI had nothing for steel in a Cheditte hull when I called them.

Thanks man.

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Re: Wad swap in RSI load

Postby Rob MacK » Fri Feb 14, 2014 2:06 pm

solway gunner wrote:Rob
Is this for an experiment or something? i think if you drop by 4 or 5grains itl be way too much of a drop and itl destroy the whole loading -2grains is more like it in my view- by stating ch209 do you mean cx2000 primer sub?id try it on 36grn straight off.Cheddite hulls are quite a forgiving hull pressure wise compared to rems and seem to shoot tps quite well but can spike quite easily with steel shot and top end loads v the rsi wad,let us know how you fair.



Yeah it is playing but I really like the TPS in the 10 so I figured lets try it in the 12. Yes cx2000 primers.

Thanks man

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Re: Wad swap in RSI load

Postby DoubleDutchChuck » Fri Feb 14, 2014 4:30 pm

Rob MacK wrote:
That said. I currently use an RSI load with 520 gn shot, Ched 3" hull, 38.0 gn ASteel, RSI wad and CH209.

I am considering a swap to the TPS 2 3/4" wad so I figure a powder decrease is in order. I figure I should go down to at least 34.0 gn of powder if not 33.0 to start.

Rob


Rob,
I agree with Kev and think that a 2gr drop in this 131 load, with the sub'd wad, would be a good starting point. If the pressure in the printed load is actually 10,200PSI, you should be okay. I'd be interested in patterns you get with the TPS wad vs. the Sam wad.
Chuck
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Re: Wad swap in RSI load

Postby cannon » Fri Feb 14, 2014 6:18 pm

DoubleDutchChuck wrote:
Rob MacK wrote:
That said. I currently use an RSI load with 520 gn shot, Ched 3" hull, 38.0 gn ASteel, RSI wad and CH209.

I am considering a swap to the TPS 2 3/4" wad so I figure a powder decrease is in order. I figure I should go down to at least 34.0 gn of powder if not 33.0 to start.

Rob


Rob,
I agree with Kev and think that a 2gr drop in this 131 load, with the sub'd wad, would be a good starting point. If the pressure in the printed load is actually 10,200PSI, you should be okay. I'd be interested in patterns you get with the TPS wad vs. the Sam wad.
Chuck


I've loaded that exact 36-gr round (well, exactly with a MM1275). As you know the fact that I loaded it don't make it safe, but I can state with certainty that my face is still as intact as it ever was.
Smell that? Smells like sumthin died in here.
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Re: Wad swap in RSI load

Postby cannon » Fri Feb 14, 2014 6:29 pm

Alright, here's what I've got from BPI's SoS 13th Ed.:

3" cheddite
CX2000
TPS 1230
Alliant steel 40 gr.
492 gr shot
1375 FPS @ 8500 psi

Couldn't fathom that dropping to 36 gr powder & upping to 520 would be a problem. You're good for a 4000 PSI jump in pressure.
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Re: Wad swap in RSI load

Postby HCK » Fri Feb 14, 2014 9:27 pm

Hull : Fiocchi 7mm base wad 3 in.
Powder : 38.0 grns Alliant Steel
Primer : Fiocchi 616
Shot Charge : 1 1/8 ounce steel shot
Wad : BP MM12234 and
a overshot card
Velocity : 1,580 fps.
Pressure : 10,800 psi

One hodgon test mm vs tps wad tps raised pressures about 1400psi higher what mm.
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Re: Wad swap in RSI load

Postby d_money » Sat Feb 15, 2014 1:24 am

I love the tps wad. I have been loading 1 1/8 oz in a 3 " ched hull with the tps wad and 38gr steel with a 1/8" felt in bottom. The tps wad makes much less pressure than the MM wad.
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Re: Wad swap in RSI load

Postby BT Justice » Sat Feb 15, 2014 4:17 am

Rob,
This is not written in stone but a good rule is to drop your powder charge a minimum of 10 % then try it. We've found dropping the powder charge down 10% usually puts you in the safe zone with BP and PR wads vs the RSI wads.
The thing is you may come up short using the 2 3/4" wad vs the 3" RSI wad in your crimp height, this can be a big factor in how the load performs unless you can compensate with some kind of spacers to tighten up the load a bit.
It's not a bad idea for a load combination what your trying to do you just have to get it tight enough to get good performance from it, I think I gave you the load information using the 3"' Federal hull and the 2 3/4 " MM wad already but you have to adjust the wad column height in that one also.
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Re: Wad swap in RSI load

Postby BT Justice » Sat Feb 15, 2014 4:23 am

cannon wrote:Alright, here's what I've got from BPI's SoS 13th Ed.:

3" cheddite
CX2000
TPS 1230
Alliant steel 40 gr.
492 gr shot
1375 FPS @ 8500 psi

Couldn't fathom that dropping to 36 gr powder & upping to 520 would be a problem. You're good for a 4000 PSI jump in pressure.

The only problem being it's highly doubtful this is a 1375 fps load (typical of BP's loads)
There's an old load from the SoS that uses 39 grains of STEEL and the MM wad in the Federal plastic basewad hull, over my chronograph that load is going 1640 fps...big difference.. :eek:
Very good performer though.
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Re: Wad swap in RSI load

Postby cannon » Sat Feb 15, 2014 7:04 am

Yeah, I noticed that. 40 grains under an oz and an eighth is definitely at least 200 FPS above what they've got listed . . . and probably closer to 400.
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Re: Wad swap in RSI load

Postby Rob MacK » Sun Feb 16, 2014 8:28 am

Thanks to all of you some very interesting information there that I did not have. It could be a while before I can pattern there is a lot of snow down. When I do I will let you know

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