less recoil with lead vs same velocity copper?

[mikeystew]

so i decided to try and cheat the mini mag corner i've been backed into by my AR-7, the only ammo it seems to like... by buying hi velocity 40g leads. they are a little faster than mini mags and the same weight, but dont seem to kick back the bolt anywhere near as hard, infact not even enough to eject any spent brass.
so at the rick of sounding like a know nothing, which admittedly i don't about rimfire, are lubed leads just faster than plated bullets given the same charge?
im thinking these bullets just dont have as much powder pushing them to reach the same velocity as a plated bullet.

 

[Winnipeg Toymaker]

If both bullets are the same weight and same grade ( not one high velocity and the other regular) then the speed should be the same. On the boxes of ammo from different manufacturers, the speed is usually noted, they all seem to be the same. Guess it may be regulated by the casings being the same size and gov't. regulations for powder ammounts.

 

[Fassteel]

Well the Mini mag is a 36gr bullet, but if both are supposed to be flying at 1260 FPS they should run your semi auto, easily. I shot lots of 1050 FPS ammo in semi autos with out any issues. FS

 

[mikeystew]

Well the Mini mag is a 36gr bullet, but if both are supposed to be flying at 1260 FPS they should run your semi auto, easily. I shot lots of 1050 FPS ammo in semi autos with out any issues. FS

the mini mag hollow points are 36g, but the mini mag round nose in my lap are 40g... all i know is the mini mag at 40g and 1235fps cycled th gun fine but the federal champion 40g solid lead at 1260fps didn't eject one empty case...

 

[Farmer Harv]

I have the same issue with an Advantage Arms .22 conversion kit for a Glock. 40gr Minimags and Remington Golden Bullet are fine, but nothing else will cycle and eject properly even if they're rated at the same or higher velocity.

Seems strange, but I've given up trying stuff and now just use these all the time now. Maybe try some Rem Golden bullets and see if they work for you also.

 

[mlehtovaara]

I was under the impression lead expanded better to create a better seal between the barrel and bullet creating slightly more pressure. Uless being pushed too fast when leading occurs. If all other things are equal they should cycle just fine. The velocities are probably exagerated on the cheaper lead ammo id say.

 

[thebigslide]

Lead seals the bore better and makes more efficient use of powder. There is also less friction between lead and steel vs. copper and steel.

Lead high velocity .22s generally use a slower powder to reduce the peak pressure (to prevent leading). That's why they perform better in longer barrels as compared to jacketed .22s. You may be experiencing cycling issues because the pressure wave has peaked when the bullet is long past the gas port.

Restricting the gas port slightly may help. It may be worth tinkering with.

 

[sevoman]

I doubt that there is much difference in 22LR between plated and plain lead bullets given similar loadings.The only way to really find out is to get a chrono and measure the velocity.Chances are that the plain lead bullets are a higher velocity round,but this has nothing to do whether they are copper washed or not.This is unlike in centrefire rounds where a true jacketed bullet will shoot slower than lead for a given charge weight due to the fact that jacketed bullets have more resistance going down the bore.