velocity with water drop WW

[canuck4570]

I know there is a lot of variance but just give me a average top FPS
of WW bullets water drop or oven and quench in water
in 458 magnum 500 gr bullet no gas check

[Jevyod]

Seems to me that the lack of gas check will be the limiting factor. I have heard of people pushing 50/50 COWW/pure +2% tin to 2000+ fps. with a good lube and a good bullet fit.

[canuck4570]

I am looking a 1500 to 1800 fps

[marek313]

I use basically water dropped COWWs plus 1-2% tin for most. You should be able to get to 1800 if you powder coat those. I'm shooting my cast Lee 312-155 (no GC) in my 300 blackout at around 1800 fps and I dont get any leading. Also use the same lead for 357 mag and 10mm. I have a feeling you will have to PC those though or you will get leading otherwise.

[canuck4570]

powder coat mmmm seems interesting

but I for the moment I will stay with the good old lube

[fredj338]

IMO, vel isn't your limit but pressures. So just depends on the load. I can run 1500fps range scrap loads in my 45-70 with no gc or water dropping. I would think quenched ww @ 1800fps with the right powder, slower, in the 458wm would be just fine.

[canuck4570]

actualy its for my 450 Rigby and the pressure are low with this huge case
I load with Alliant 5744
this is the bullet used its a Saeco 500 gr.
and the rifle used

https://i.imgur.com/EOxL7Dul.jpghttps://i.imgur.com/g7TIIJvl.jpg

[Larry Gibson]

I know there is a lot of variance but just give me a average top FPS
of WW bullets water drop or oven and quench in water
in 458 magnum 500 gr bullet no gas check

Depends on the accuracy level your interested in(?). The mentioned (later post) of 1500 - 1800 is probably doable, especially if you add 2% tin to the COWWs. My own experience with my 450-400-70 is that 1400 - 1600 fps with a hard PB'd cast bullet with medium burning powders before accuracy begins to fall off.....and when it falls off it falls off fast......

[canuck4570]

up to now 42.5 gr of 5744 brings me to 1470 fps and no leading
this spring more test
the load above is 1 1/2 inches at 100 yards

[Don1357]

I think you are mixing concepts.

I'm guessing you are getting at how hard you can push a water quenched boolit before it starts leading? The thing is this; Speed is not a factor in leading at all, pressure is. There are pellet guns that can push 1650FPS, with no lubrication, dead soft pellets, 0 leading. The reason being the rifles cannot generate pressure levels where the soft lead gets deformed enough for that.

Heck some powders can accelerate a boolit faster with less pressure, or the opposite; other powders can generate higher pressures and less speed. You need to look at what your particular powder is doing on your specific gun for a given weight and cramping style.

You can do a whole lot of math to come to an approximation but the easiest thing is to shoot until your grouping goes to hell. If you get lead deposits on your barrel clean it up and move on, not the end of the world.

[44Blam]

There are a few limiting factors. One is pressure and trailing edge failure... But read up on what Larry Gibson has been doing. A lot of the problem with pushing boolits too hard isn't velocity, but with RPM of the boolit...

[canuck4570]

I had once a Sako TRGS in 416 Rem and it had a 1/16 twist
this rifle I could push with a RCBS 350 gr cast bullet gas checks at 2400 fps and no leading and the accuracy was 1 inch but with IMR 7881 well bug hole all the time
tried it without gas check and open up to 3 to 4 inches.
I guess the slow twist did a part in this
so I eased the powder and around 1700 fps got back the fantastic accuracy

[Don1357]

I had once a Sako TRGS in 416 Rem and it had a 1/16 twist
this rifle I could push with a RCBS 350 gr cast bullet gas checks at 2400 fps and no leading and the accuracy was 1 inch but with IMR 7881 well bug hole all the time
tried it without gas check and open up to 3 to 4 inches.
I guess the slow twist did a part in this
so I eased the powder and around 1700 fps got back the fantastic accuracy

From 1700 fps to 2400 fps all thanks to a measly gas check is quite a performance boost.

[canuck4570]

yes but don't forget that it was a bullet without the gas check not a full base
maybe that was the big draw back

[Larry Gibson]

Same here. I push a 457483 (GC'd ) at 2300+ fps with 2 moa or less accuracy (10 shot group at 100 yards....yes that's a hard one off a bench). The identical PB'd 457124 cast hard and then heat treated won't give that same accuracy at 1600 fps.

[DonHowe]

Factory 500 gr FM's don't make 2100fps. Unless her killin elephant...