There are no laws that prohibit ML bullets from being the same diameter from bullet-to-bullet.... component-to-component .... accessory-to-accessory. You may have five different fractional and/or one-thousands-difference in diameters in each Powerbelt 15/20 pk.

You need to try them for fit & accuracy. That's the best way to find a good bullet. What works well in gun built one minute after yours - on the same assembly line -- may not shoot anywhere near the same target holes sid-by-side.

That's the beauty of this sport. Whenever someone here announces they worked-up a nice, personalizedbullet, primer & powder choice-load, they really did all the preparation & work themselves.