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If the weight and profile are similar, I don't think there should be any difference. Lead Flat Point and Lead Flat Nose are the same thing as far as I know.
Depends on how hot you are loading them. If one is longer than the other and you seat them to the same OAL, then the longer bullet will be seated deeper and will have increased pressure.
Also the location of a crimp groove if you are crimping as that usually determines the case volume as well. I have noticed different brands of revolver bullets have crimp grooves that are in different places so you have to pay attention when changing bullets with an established load.
Another two questions. Can a 405 gr cast with gas check be used in place of a regular cast bullet without gas check. And can a .458 diameter cast bullet be substituted for a .458 dia.?
The main thing you need to concern yourself with, all other things the same, is how deep the bullet is seated in the case. This has the most effect on pressure, and velocity, when the bullets are similar in composition, weight, and bearing surface.
Another two questions. Can a 405 gr cast with gas check be used in place of a regular cast bullet without gas check. And can a .458 diameter cast bullet be substituted for a .458 dia.?
On the gas check question. If bullet weights are same, seating depths the same.....it should present no problem.
On the .458 cast bullet question. I assume that you mean, a cast substituted for a jacketed bullet. Obviously, you would have to work up a load for the cast. Also, the bore diameter may play into this a bit. Generally.....cast bullets tend to shoot more accurately if they are somewhere between 0.001” to 0.003” larger in diameter than the firearm bore. “Slugging” the firearm bore will give you an indication of about where you would want to be with a cast bullet. I also said “generally”......this is not to say that a cast bullet of same size as the bore will not shoot accurately. However, leading and accuracy may be issues.
Also, it most situations you should not interchange cast and jacketed bullets, without a thorough bore cleaning. Again as generality......cast bullets do not shoot well through a bore with jacketed bullet fouling remaining! If you have a very smooth, slick bore, this may not be a huge issue. A somewhat rough bore has more copper fouling which has a detrimental effect on cast bullet accuracy!
Obviously the statements above are my opinions and should be valued as such. memtb
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