Posted an article here called something like "Long Range 30-30". Some feedback questioned why I do not crimp bullets so they don't move during loading and during recoil in a Marlin 336. Without testing I replied there was no need to crimp as the tiny recoil of a 30-30 in a 336 and the magazine tube spring do not have the pressure to move normally reloaded bullets in properly fitted dies.
What WAS the pressure required to move a seated, non-crimped bullet? I had to test.
Isaac Newton talked of "objects at rest staying at rest". That is the issue with bullets pulling OUT of a case during recoil. The 30-30 has little recoil but what about the magazine tube spring and pressure loading a full tube? My guess is the spring is way too light to do much but there's a binding as you press shells into the tube that can seem high.
I just took 4 cases, deprimed, measured wall thickness and outside neck diameters before and after sizing. With that knowledge and some Sierra 150 gr. flat points I measured neck tension. The brass varied from .009" to .011" thick. Actually I think that's real thin but it is what it is. After sizing and doing the measurements, one Remington case would only have .003" of interference fit. Two others were at .004" and one at .005". What kind of pressure would that take to push those bullets in?
Bullets were seated .35" into the case necks. That's not all the way to the neck bottom but right at the cannelure on these bullets. First time on the bathroom scale and I could not push them in at all just holding the cases in my hand. Got to 30 lbs and my hand got sore.
Devised a holder with the shell holder inside a socket. Took the case with "only" .003" interference (the thin one) and pushed to 60 lbs and the bullet did go in.
I went OVER 70 lbs on the other three, could not push any harder, my hand hurts and none of the other three moved.
My conclusion is there's no reasonable way you are going to push those bullets farther into the case during magazine tube loading and certainly not going to get them to move OUT during shooting with such low recoil.
You don't need to crimp.
What WAS the pressure required to move a seated, non-crimped bullet? I had to test.
Isaac Newton talked of "objects at rest staying at rest". That is the issue with bullets pulling OUT of a case during recoil. The 30-30 has little recoil but what about the magazine tube spring and pressure loading a full tube? My guess is the spring is way too light to do much but there's a binding as you press shells into the tube that can seem high.
I just took 4 cases, deprimed, measured wall thickness and outside neck diameters before and after sizing. With that knowledge and some Sierra 150 gr. flat points I measured neck tension. The brass varied from .009" to .011" thick. Actually I think that's real thin but it is what it is. After sizing and doing the measurements, one Remington case would only have .003" of interference fit. Two others were at .004" and one at .005". What kind of pressure would that take to push those bullets in?
Bullets were seated .35" into the case necks. That's not all the way to the neck bottom but right at the cannelure on these bullets. First time on the bathroom scale and I could not push them in at all just holding the cases in my hand. Got to 30 lbs and my hand got sore.
Devised a holder with the shell holder inside a socket. Took the case with "only" .003" interference (the thin one) and pushed to 60 lbs and the bullet did go in.
I went OVER 70 lbs on the other three, could not push any harder, my hand hurts and none of the other three moved.
My conclusion is there's no reasonable way you are going to push those bullets farther into the case during magazine tube loading and certainly not going to get them to move OUT during shooting with such low recoil.
You don't need to crimp.