why lyman bullet 200g powder difference

[Thinktwicez71]

i am a total noob here , so please ignore my stupidity.

what makes the lyman 452460 200gr bullet be able to start at 3.5g bullseye and go to 5.6

but the 452630 200g lyman the data says start at 4.9g bullseye and go to 6.0

can someone please explain why one 200g bullet from lyman can start at 1.4g less of the same powder over another 200g bullet .

load data on page 382 of lyman 49th edition.

[MtGun44]

Probably the intended use. The 452460 is a match boolit, don't know the other one offhand.
Probably not max pressure limited.
Bill

Another point - the 3.5 is a known good match load, real accurate with that boolit, but frequently
is too low power to cycle a gun without lower power recoil spring added. I imagine the 4.9 is
where the load will cycle the action with a std spring reliably.

[Trey45]

The 452460 has more bullet inside the case, less case capacity, more pressure, just the opposite of the 452630, by the way, there is no such thing as a stupid question.

[Bert2368]

There IS a stupid question- The one you were too embarassed to ask, and not asking got you killed...

[fredj338]

Bearing surface & OAL. It's about case volumn, decrease the volumn, increase the pressure.

[JesterGrin_1]

i am a total noob here , so please ignore my stupidity.

what makes the lyman 452460 200gr bullet be able to start at 3.5g bullseye and go to 5.6

but the 452630 200g lyman the data says start at 4.9g bullseye and go to 6.0

can someone please explain why one 200g bullet from lyman can start at 1.4g less of the same powder over another 200g bullet .

load data on page 382 of lyman 49th edition.

As others have said there is no such thing as a stupid question. So if you have a question ask. Also read all you can and use the search function here as you will also find lots of good information.

Other than your Lyman 49th Edition book you can also go to Hodgdon.com for up to date load info.

Also as said even if one Bullet will weigh the same as another one can take up more space than the other which will change the amount of space available for powder.

On another note start at the starting charge weight listed and work your way up to an accurate load and also look out for pressure signs as well. All this info is on this site.

[Thinktwicez71]

i sitll honestly don't understand this , everywhere i look online , if you type in 200g lswc for a 45acp , people are talking about loads that are 3.5-4 for bullseye powder , am i missing something ? Secondly , i tried sizeing them to .001-.0015 over size and loaded with 4.4-4.8 and they leaded some , not as bad as the ones that where .451. should bumping up the charge more help with sealing the bore better? with the bullet i am shooting , the lyman book specs 4.9 - 6.0 for bullseye powder. What would you try for powder/ seating depth / powder grains to help get rid of the leading in this kimber 45acp ?

and yes ....i know my 4.4-4.8 was below starting grains load , so maybee that even has something to do with it , my cast bhm is 9 (test confirmed)

[Trey45]

Change to a harder lube maybe, or maybe just a different lube. You might try adding some antimonial lead to your mix to harden your alloy also.

[Cherokee]

Adding antimony will also tend to give you a larger diamater bullet. Adding powder will increse the pressure and may cause the bullet to expand enough to cut the leading. If you are using commercial cast bullets, they are probably harder than you need. If you are casting your own, then what is your alloy ?

[Thinktwicez71]

my alloy is straight wheel weights air cooled , tested by my gunsmith at 9bhn

[Thinktwicez71]

and i sort out all the zinc and tape on kind , those don't go in there

[Thinktwicez71]

here are some loaded

[leadman]

Might try dropping your bullets from the mold into a bucket of water to harden them some. Some have good experiences with soft bullets in the 45, but I found water dropped worked better and stopped the leading.