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How large a diameter?

This is a discussion on How large a diameter? within the Reloading forums, part of the Firearm Forum category; I'm reloading for my .30 Carbine Blackhawk. Of course its diameter is .308. Now, I've been told many times and repeatedly that I should use ...


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Old February 24th, 2017, 08:20 PM   #1
 
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How large a diameter?

I'm reloading for my .30 Carbine Blackhawk. Of course its diameter is .308. Now, I've been told many times and repeatedly that I should use at least a .309 diameter when using cast bullets. I've also been told many times and repeatedly that I should be able to easily insert the bullet into the forcing cone at the breach of the barrel. The problem is that .309 bullets do not easily fit into the forcing cone, lest I use a hammer.

So which of the 2 pieces of advice should I go with?



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Old February 25th, 2017, 06:43 AM   #2
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jski, Either you were told wrong or you didn't understand the situation. Bullets should pass through the cylinder's throat .... not the barrel's throat. Chances are a .309" bullet will not pass through the throats on your cylinder unless you ream them. Why? The factory assumes you will use .308" jacketed bullet .... which should also pass through the cylinder throats with minimal finger pressure. This feat is done by pushing a bullet nose first through the front of each cylinder throat.
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Old February 25th, 2017, 09:12 AM   #3
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On topic, but an aside; Are the Ruger 30 Carbine cylinders designed for the case to headspace on the mouth?
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Old February 25th, 2017, 10:45 AM   #4
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mdi, Yes, like other rimless cases, the 30 Carbine headspaces on the case mouth.
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Old February 25th, 2017, 10:00 PM   #5
 
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With the headspacing at the case mouth and the tightening of the cylinder throats, I was forced to push the .309 bullet deep into the case ... maybe too deep ... to get it to seat properly in the chamber. It would certainly constitute a compression load.

I used the 50 .309 diameter bullets I had and called Montana Bullet Works and changed my order to .308.
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Old March 3rd, 2017, 03:53 AM   #6
 
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For revolvers, you need the following:
1) the lead bullets should be AT LEAST a snug slip fit through the cylinder's throats
and
2) the lead bullet should be AT LEAST 0.001" LARGER than the actual measured groove diameter of the barrel (don't assume you know the groove diameter, measure it or have a gunsmith measure it). If you decide to use an 18-22 BHN alloy, be sure the bullet is AT LEAST 0.002" larger than the actual groove diameter. Even with a jacketed bullet, the bullet should be the same diameter as the actual groove diameter. SAAMI specifies the groove diameter as 0.308-0.310", with jacketed bullets being 0.306-0.309 for the manufacturers so the ammunition works in all guns. The reloader is free to match components to his gun. Notice that even for the manufacturers, a jacketed bullet that is 0.001" larger than the groove diameter is just fine.
Finally, how can you push the bullet through the forcing cone, as it hits the rifling? Don't understand that thought.
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