Barnes Expander MZ aligner tool size?

[gnartogue]

I am shooting .45 cal barnes expander mz bullets in .50 cal sabots. I am looking to purchase an aligner tool and I am confused as to whether I should get the .45 cal or .50 cal aligner. Is there a better tool that anyone would recommend? Any info would be appreciated.
https://shop.barnesbullets.com/en_us/bullet-alignment-tools.html

 

[Bill V]

50 cal but I noticed that they are out of stock. The aligner not only fits the profile of the MZ nose but also keeps the bullet centered in the bore. The 50 caliber is slightly less than .500 diameter.

 

[gnartogue]

50 cal but I noticed that they are out of stock. The aligner not only fits the profile of the MZ nose but also keeps the bullet centered in the bore. The 50 caliber is slightly less than .500 diameter.

good to know. I found them in-stock elsewhere. thanks for the quick reply