Gjordin
Member
When you a choosing a jacketed bullet is it safe to use bullets that are oversize? Example .400 bore and a .401 bullet. I have read it safe with solid lead bullets.
Bullet dia. question???
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243winxb
Member
Bore & Groove are 2 different things. Bullet diameter .001" larger than the groove is ok. Lots of times you will see jacketed bullets at .400" and lead at .401" Bore is a common term we all use. SAAMI uses "bore" for what i would call the lands? A hole is bored thru the barrel blank, then grooves are cut into it, called rifling. http://www.saami.org/PubResources/CC_Drawings/Pistol/40%20SandW.pdf
rcmodel
Member in memoriam
.001" makes no appreciable differance in pressure, even with jacketed bullets.
Hornady pistol bullets for instance are in general, .001" larger then Speer, Sierra, jacketed bullets of the same caliber.
Plated bullets are often made .001" larger then jacketed bullets.
With lead bullets, if it will fit in the chamber, it is safe no matter how big it is.
A lead bullet will be made to fit the chamber throats & bore by the time it moves one bullet length out of the case.
If you have ever sized & lubed cast bullets you would notice the force required to size them down several thousandths is just a few pounds, not 1,000's of pounds like chamber pressure.
rc
Hornady pistol bullets for instance are in general, .001" larger then Speer, Sierra, jacketed bullets of the same caliber.
Plated bullets are often made .001" larger then jacketed bullets.
With lead bullets, if it will fit in the chamber, it is safe no matter how big it is.
A lead bullet will be made to fit the chamber throats & bore by the time it moves one bullet length out of the case.
If you have ever sized & lubed cast bullets you would notice the force required to size them down several thousandths is just a few pounds, not 1,000's of pounds like chamber pressure.
rc
Gjordin
Member
So is my term "bore" used incorectly?
rcmodel
Member in memoriam
Bore is fine.
Everyone knows what you are talking about.
But as 243winxb said, technically, the actual bore, as drilled through the barrel, is measured to the tops of the lands, while the grooves are deeper.
Using a 30-06 rifle for instance, the "bore" made by the drill bit is .300", or .30 cal, while the groves made by the rifling cutter in the bore hole are .004" deep x 2, or .308" across.
SO, it uses .308" bullets, not .300" "bore size" bullets.
rc
Everyone knows what you are talking about.
But as 243winxb said, technically, the actual bore, as drilled through the barrel, is measured to the tops of the lands, while the grooves are deeper.
Using a 30-06 rifle for instance, the "bore" made by the drill bit is .300", or .30 cal, while the groves made by the rifling cutter in the bore hole are .004" deep x 2, or .308" across.
SO, it uses .308" bullets, not .300" "bore size" bullets.
rc
For lead bullets, you want a bullet that is at least 0.001" larger than groove diameter.
For jacketed bullets, you can shoot bullets that are several thousandths smaller than the groove diameter. The 9x19 guns used in WWI and WWII had groove diameters as great as 0.360" groove diameters shooting a 0.355" bullet.
Back in the '60s-'80s, 9x19 was not a popular cartridge. The commercial barrels were still made to military sloppy standards.
Due to not being popular, it was hard to find 9mm bullets. It was very common to fire 0.357" jacketed bullets even in barrels with a groove diameter of 0.3550". Never had any problems.
The first you must consider, though, is your question. Your question sounds as though you want to just jump right into a load without working up from a starting load.
To this day, there are 0.357" jacketed bullets I prefer over 0.355" bullets and continue to load them.
For jacketed bullets, you can shoot bullets that are several thousandths smaller than the groove diameter. The 9x19 guns used in WWI and WWII had groove diameters as great as 0.360" groove diameters shooting a 0.355" bullet.
Back in the '60s-'80s, 9x19 was not a popular cartridge. The commercial barrels were still made to military sloppy standards.
Due to not being popular, it was hard to find 9mm bullets. It was very common to fire 0.357" jacketed bullets even in barrels with a groove diameter of 0.3550". Never had any problems.
The first you must consider, though, is your question. Your question sounds as though you want to just jump right into a load without working up from a starting load.
To this day, there are 0.357" jacketed bullets I prefer over 0.355" bullets and continue to load them.
Gjordin
Member
any of you guys load 40 s&w? Any tips on loading, good combos on powder primer and bullet types?
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