MP

[Michael]

Received a notification from MP last week that a couple of molds were back in stock. Ordered them last Thursday, our UPS man delivered them around 4pm today. As I have mentioned before, gotta love Slovenian newspapers, even though my wife feels differently.

Speaking of MP molds, looking at couple of others. Does anyone have any experience with his 44 Terminator mold or the 65gr .227 mold, any tips or results that you care to share.

Many thanks,

Michael

 

[Wadsworth]

The molds you bought wont get you in trouble, but the darn newspapers they're packed in sure do! Wad

 

[CWLONGSHOT]

Awesome molds. I treat mine with mineral oil for storage. (Short moderate term storage.)

CW

 

[Dimner]

I have the brass .227 65gr mold. I have nothing much I can tell you about it, unfortunately. I got frustrated with it and stopped using it. The bright side is that I could tell that it was 100% an issue with me. I had a heck of a time keeping the mold temp from not getting too hot. That caused my bases and sprue cuts to rip. I tried a bunch of different methods to fix it, the best at the time was waiting about 20 seconds for the sprue to cool. So I got impatient and gave up and went to a NOE aluminum mold. It's the first brass mold I have owned.

I did end up with enough good bullets to do some shooting and they worked fairly good in my AR15. I could tell that I would be able to find the right load to get 2-3moa at 100 yards.

Also keep in mind this was pre covid. so like 2 years ago? And I would like to think I'm more knowledgeable with what I am doing. I have different practices now on my alloy, melt temp, casting speed etc. I think it would be pretty easy to get better results now.

 

[boatswainsmate]

Brass Mold? Heat cycling them before use will save you headaches. They also like to be run HOT. Boats

 

[Dimner]

Here are some loads that did well for me:

Powder	Charge	Avg Velocity	Standard Deviation	Extreme Spread
Rx7	15	2083.5	6.856	15
H4198	15.5	1970	13.115	26
H4198	16.5	2269.4	19.06	51

I tried H4895 and Alliant 2400 but they did not do well in my 16" barrels.

 

[Tomme boy]

I have had real good luck with rl10x with the 65gr mp. 2600-2700fps can't remember right now. most ar barrels are now 1-7tw so that may be your problem. i have a 1-8 and a 1-9 twist and both do fine. With the edge going with towards the 1-9.

 

[Spindrift]

I’ve shot the MP 227-65 a bit in my .223 bolt gun, lubed bullets mostly. It shot very well, I like it!
I have a 6-cav, works like a charm.

 

[ChestnutLouie]

I am considering the purchase of an MP mold for use in my 45 ACP hi-point carbine (powder coated)

How much do they charge for shipping?

Thanks
Francis

 

[RBHarter]

It's included in the price I believe.

 

[Tomme boy]

Its around $25 for shipping in the USA

 

[Dimner]

Shipping is also super fast. I got mine in 3 business days!

Tommy is correct about the $25. There is a shipping calculator in the cart on MPs website.

 

[ChestnutLouie]

I received the MP 452-374, 230 grain round nose with no lube grove. WOW what a nicely made mold. I cast a few pounds and did not tap the mold even once, they all fell out when I opened. But I have questions.

Bullets cast from the MP mold are .695" long

with a COAL of 1.270" for the MP mold so there is about .339" inside the case

-------------------------------------------------------------------------------------

Bullets cast from my LEE 230 grain tumble lube round nose are .665" long

with a COAL of 1.267" for the Lee mold so there is about .290" inside the case


The recipe that I used for the LEE bullets is from the LEE book @ 6.5g to 7.0g of 800X with a coal of 1.200" (Federal Large Pistol Magnum Primers)
the velocity difference between magnum and regular primers is slight and I have more magnums

I am using 6.6grains of 800X (at the low end)

what are your experiences / thoughts on the safety of the MP bullets at this COAL?

thanks
Francis

 

[Michael]

Hi Francis. I do not have any personal experience with this mold. Generally I will start with setting the COL to long as the magazine and/or chamber will allow. I have read that some rounds are particularly sensitive to seating depth and pressure go up significantly when seating deeper than recommended. Your concerns have merit, I myself would not worry about it, not at 45ACP pressures and cast bullets. Considering the large number of 230-ish grain mold options out there, one could compare load data from Lee with that from different sources, Lyman, Hodgdon/IMR, Speer, etc. and see how they differ. I think if 0.030" in seating depth with cast bullets in a 45ACP was problematic there would be a lot of chatter and warnings in manuals and etc., I could be completely wrong, Start low and work up is always good a practice. Being this particular post has not drawn a lot of attention, might start a new post post with your query for better visibility. MP molds sure are nice aren't they? Hope this helps.

 

[ChestnutLouie]

Hi Francis. I do not have any personal experience with this mold. Generally I will start with setting the COL to long as the magazine and/or chamber will allow. I have read that some rounds are particularly sensitive to seating depth and pressure go up significantly when seating deeper than recommended. Your concerns have merit, I myself would not worry about it, not at 45ACP pressures and cast bullets. Considering the large number of 230-ish grain mold options out there, one could compare load data from Lee with that from different sources, Lyman, Hodgdon/IMR, Speer, etc. and see how they differ. I think if 0.030" in seating depth with cast bullets in a 45ACP was problematic there would be a lot of chatter and warnings in manuals and etc., I could be completely wrong, Start low and work up is always good a practice. Being this particular post has not drawn a lot of attention, might start a new post post with your query for better visibility. MP molds sure are nice aren't they? Hope this helps.

I'll do that, thanks.

 

[CZ93X62]

I don't know how faithfully MP follows the design guidelines of the Lyman #452374, but Browning had very specific design parametersfor his 230 grain bullet meant for the GI cartridge form. Lyman allegedly followed the Browning design specs closely.

Using my own 1970's-vintage #452374, Lyman gives an OAL spec of 1.272" for the finished cartridge. When seated at this length, the ogive avoids the abrupt and short throat leade found in GI pistol barrels. IMO, this is also fairly deep seating of the bullet base. My usual load that duplicates GI ballistics is 5.0 grains of Bullseye (so imaginative, eh?) or 5.4 grains of WW-231, which gives 825-840 FPS in 5" barrels. To duplicate my carry loads, I use 5.7 grains of 231 for 875-890 FPS (WWB JHPs).

 

[seagiant1]

Hi,
Fantastic Molds!

 

[ChestnutLouie]

I don't know how faithfully MP follows the design guidelines of the Lyman #452374, but Browning had very specific design parametersfor his 230 grain bullet meant for the GI cartridge form. Lyman allegedly followed the Browning design specs closely.

Using my own 1970's-vintage #452374, Lyman gives an OAL spec of 1.272" for the finished cartridge. When seated at this length, the ogive avoids the abrupt and short throat leade found in GI pistol barrels. IMO, this is also fairly deep seating of the bullet base. My usual load that duplicates GI ballistics is 5.0 grains of Bullseye (so imaginative, eh?) or 5.4 grains of WW-231, which gives 825-840 FPS in 5" barrels. To duplicate my carry loads, I use 5.7 grains of 231 for 875-890 FPS (WWB JHPs).

No lube gruve, a rather long nose and they weigh 240 grains -- the part of the bullet that touches the rifeling is longer than the Lee 230TL