Rocky Mountain Reloading load data

[CopperFouling]

At the recommendation of a friend, I bought some Rocky Mountain Reloading .357 flat-nosed bullets. Since the design of the bullet does not match what I have in my Lyman manual, I am stuck looking for another source of information. Is there a manual out there that has load data (.38 Spl. and .357 Mag.) for these bullets? Thanks.

And if this is a question asked frequently, I apologize. I did try a search, but I did not find a thread for this.

 

[wackemanstackem]

Good luck I bought some from them for my 45 and 40 since they where all i could find have called and texted him to no avail.That being said I had trouble with his flat points ,they have a very wide nose and had to seat very low ,lower than I am used to so kept backing off the powder till I got it right.I used lead data for the weight which is the norm for a plated or you can use jacketed data and back off atleast 10% if you dont go less than recommended oal. find some data on your weight bullet for powder and work it from there.

 

[Walkalong]

Which particular bullet? RMR has sold various bullets.

 

[KansasSasquatch]

Just start with the minimum jacketed data for your weight and seat them to 1.45". Work your way up carefully. Make sure they all leave the barrel and stay a little below max for that weight of jacketed bullet.

 

[CopperFouling]

they have a very wide nose and had to seat very low

That's kind of what I was noticing. The crimp groove appears higher on them than on the other jacketed bullets that I have used. I obviously want to seat them to an acceptable OAL.

Which particular bullet? RMR has sold various bullets.

The bullets are 158-grain round-nose flat points. They are completely jacketed, and they have a crimp groove. I tried to find an image, but the site is sold out of .357s right now.

 

[wackemanstackem]

Go with what sasquatch said youl be fine ,your oal is not as critical in your revolver as far as chambering like a semi-auto,put them on the crimp groove and you should be fine.

 

[Hondo 60]

Rocky Mountain Reloading does NOT make bullets.
They are a middleman.
They buy from others & package them for retail customers.

So there is no manual that lists "Rocky Mountain Reloading bullets".
You'll just have to find data for a similar bullet.

 

[Hungry1]

I recently reloaded and shot several hundred of these bullets in 357 Magnum cases. Very happy with them.

I used 1.540" COAL

This length seated the bullet in the lower portion of the cannelure.

I used Red Dot.

They all shot Very Well .

 

[longdayjake]

If it helps, the bullets you bought are the 158 grain RN Xtreme. From Xtreme bullets. I personally just use jacketed data to load them. The cannelure should give you a pretty good idea of where to seat them. Just work up your loads like you would with any other unfamiliar bullet and you will be fine.

 

[burger]

I use these same bullets and love them. my favorite load is
7.7 grains unique
seated to the cannelure.


Posted from Thehighroad.org App for Android

 

[CopperFouling]

If it helps, the bullets you bought are the 158 grain RN Xtreme. From Xtreme bullets. I personally just use jacketed data to load them. The cannelure should give you a pretty good idea of where to seat them. Just work up your loads like you would with any other unfamiliar bullet and you will be fine.

Sounds good. Thanks.

7.7 grains unique

I've been using Bullseye for my .38s and 2400 for my .357s, actually. I've not used Unique yet.

 

[CopperFouling]

I checked in another reloading manual that I have. Speer lists a 158-grain TMJ FN (Part No. 4207) with a COAL of 1.57" and a starting charge of 13.8 grains of 2400. Is that Speer bullet essentially the same as the Xtremes?

 

[longdayjake]

The TMJ is a plated bullet, but I think the plating is slightly thicker than the Xtreme. That said, a lot of plated companies recommend using data for TMJ.

 

[CopperFouling]

The TMJ is a plated bullet, but I think the plating is slightly thicker than the Xtreme. That said, a lot of plated companies recommend using data for TMJ.

I called Xtreme today, and the customer service person told me the same (to use TMJ load data). Problem solved. Thanks for the help.