RCBS 45-255KT vs Lyman 452424 Cast Bullet shootout!

[BigBearJoe]

it'll improve the situation about 99% better.



the problem with them isn't out, it's in.
slip a couple of 9mm bullets back in the case and you won't have that pistol very long.
they simply ain't made to take 90-K more than once.

You are correct, bullet crimp jump in revolvers (why I always roll crimp in the crimp groove), and bullet setback in semi autos. Even when loading 45acp and 9mm lugar, I always make a very firm taper crimp. Crimping for semiautos also seems to help consistency, and therefore accuracy. Crimp jump only jams up the revolver, whereas, setback can destroy the gun. Bullet jump even happens to cap & ball revolvers

 

[Bret4207]

I kinda disagree with you on the part about the bullets not needing to be crimped at all. All revolver ammo should have the bullets crimped to keep them from pulling out during recoil and causing the cylinder to lock up. I've personally seen this happen before. This isn't so much of a problem with magazine fed semi-autos because the magazine keeps the bullets from moving outward during firing.

For me, I'm a firm believer in crimping in the crimp groove for revolvers, that's what it's there for. However, a couple of weeks ago I decided to test out a Pietta 1858 Remington new Army replica I have had for a few years now but never shot. I bought it used still in the box and it came with a 45 colt conversion cylinder. I made up some 45 colt blackpowder cartridges using the RCBS 45-255KT bullets over 32 grains FFFg Goex. The bullets were too long crimped in the groove so I crimped them over the forward (top) driving band to shorten them up to fit the cylinder. As it turns out, these shorter BP cartridges crimped above the driving band were surprisingly accurate in that gun! The only problem was that on the second cylinder-load, the cylinder started sticking around the cylinder pin. The cylinder still rotated and fired off the second set, but removing the cylinder after that second loading required a leather mallet and fresh water to dissolve the BP residue to pull the pin out. I never have had this problem shooting round balls with the other 1858 Remington I have, an Uberti. I'm thinking that the Alox used to lube the bullets mixed with blackpowder residue might have been the problem. Next time I'll try lubing the bullets for the blackpowder cartridges with SPG to see if that improves the situation any.

all good fun

Depends entirely on what you're shooting load-wise. The heavier the bullet, the heavier the load, the more things head in that direction. But you can use different types of crimp or use other methods to gain neck tension if it's required. My point is that you don't have to use the crimp groove. You can use a lube groove or crimp on the bullet body if you want. It's all part of the game you play wringing out a gun. The bullet that shoots best in your gun might be a complete flop in a different one. You never know until you play around.

 

[Dogdoc]

Not throwing stones .

Accuracy tests should be done with one chamber, that removes 4-6 sets of variables right off . I never hold to that especially after a baseline expectation is established. I matched up the chambers in the RBH I still have one that throws one out , probably the big one I tried to match but .455 is too big when the other 5 are .4540-.4545

Disagree . What matters to me is how the load shoots in the revolver for six rounds as will be the case in a field situation . If I can get a load that groups 2 inches or less at 25 yards for 6 rounds in sequential revolver chambers I am happy. Shooting with one cylinder is like shooting on a barrel fixture in a 1911. It does not tell what the revolver in total can do. When I am shooting at a coyote in my cow pasture , I may need multiple shots and sure do not have time to line up a particular chamber.

 

[Bret4207]

Disagree . What matters to me is how the load shoots in the revolver for six rounds as will be the case in a field situation . If I can get a load that groups 2 inches or less at 25 yards for 6 rounds in sequential revolver chambers I am happy. Shooting with one cylinder is like shooting on a barrel fixture in a 1911. It does not tell what the revolver in total can do. When I am shooting at a coyote in my cow pasture , I may need multiple shots and sure do not have time to line up a particular chamber.

But the question is which bullet shoots best with what load in that gun? If you want to remove variables, then one chamber is chosen and when you find the best load with the best bullet you know you've eliminated the variables by a factor of 5 and you should then find the best accuracy with all 6 loaded. I understand completely what you are saying, but if you are going to do an "X vs Y" showdown you have to eliminate whatever variables you can. Then you should, in theory at least, have the best grouping bullet/load for any chamber in the gun.

BTW- Welcome! Nice to see someone with a cow pasture that blasts coyotes!