Crimp Groove on an Auto Boolit

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On a different thread, Crimpin on the groove, I posted a comment about crimping the boolit into the crimp groove using it as a depth gauge and putting a slight taper crimp on it so it headspaces correctly as the question was about a crimp groove. A couple of people commented that they had never seen a crimp groove on an auto boolit and I guess this is the first ones I have bought that have them but didn't realize it so I thought I would post a picture of the boolit and ask "Is this indeed a crimp groove"?

Missouri Bullet Company IDP #4-XD 200gr RNFP .452
It sure looks like one to me.
BTW: I works great seated into the "crimp groove" in my Kahr over 4.2gr of Promo.

Yes it is a crimp grove. That is the Magma 45-200-rnfp. Good for both revolvers and 45 acp. Usually works well in the acp when crimped slightly into the grove. You need to hold your dimension on the case mouth. For head space.
acp dies I have (Dillon) does not have a seat plug that centers the rnfp very well. You may wish to modify your plug with epoxy or get a revolver seat plug. Just make sure you can get the bullets straight.

I have that mold btw. It's a great shooter in acp and smacks hard.

Yep....crimp groove on a 45 ACP boolit as it is more than likely meant for a 45 Colt. This doesn't mean the boolit can't be used for the 45 auto though. I actually designed a 45ACP/45 Colt boolit for my needs and it's running in at about 225 grains. Very accurate in the ruger flat top 45 revolver with either the 45 Colt cylinder or the 45 ACP cylinder and the design does very nice in the 45 colt lever action rifle as well as in the 45 ACP pistol.

http://www.accuratemolds.com/bullet_detail.php?bullet=45-225B-D.png

I don't crimp in the crimp groove for the auto as I designed it to be crimped about in the middle of the front drive band.

Missouri Bullet Company IDP #4-XD 200gr RNFP .452
It sure looks like one to me.
BTW: I works great seated into the "crimp groove" in my Kahr over 4.2gr of Promo.What is your COAL with that boolit design?

I'm running it at 1.173 and taper crimping it to .474. Goes in with just a little push.
BTW: MBC markets this boolit as being designed specifically for a Springfield XD. I also checked some Berrys Boolits also in RNFP and 200gr that I haven't used yet and they look identical to these, crimp groove and all.
Guess the question which I didn't think of when ordering them was why if it was for an XD it had a crimp groove?

I believe that is a design for the 45 long Colt to be used in lever actions in cowboy action shooting with low recoil.
It may work in 45 ACP but should be taper crimped since that is what the designer of the cartridge and firearm intended.
I also think the bit about the design being for the XD is a marketing technique, a call to Magma can establish the truth of this claim.

Since max SAAMI spec for case mouth diameter in 45 ACP is .473" the case mouth should be crimped to at or below that figure. Most use around .471-.470" or so as an average, as this crimps both short and long cases and turns the case mouth flare in.

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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