Bullet dropped light. How to adjust load data?

[multigunner76]

My lee 124 grain TL mold is dropping light. Right at 117 grains instead of 124. I have been loading the 124 grain boolits to 4 grains of Red Dot. How should I adjust the load data to the lighter boolit. This is a new alloy blend. Id like to adjust the load to the weight if I can. Any suggestions?

Wanted to add. Although I have been reloading for a few years, Ive just started casting my own. I ran out of the lead I started with. It dropped spot on at 124 grains. Now I have around 1k lbs. of this new alloy and I dont know what to do to adjust the load. Thanks!!!

[RED333]

Looks like you have 2 ways to go.
New alloy or work a new load for you new alloy.
Just look at is a new learning experience.

[multigunner76]

Looks like you have 2 ways to go.
New alloy or work a new load for you new alloy.
Just look at is a new learning experience.

New alloy is out of the question. Would it be safe to try the 4 grains of Red Dot? or should I start a little lighter? Seems to me that the Lighter boolit should take a tad bit more powder.

[Yodogsandman]

Use a little less powder to get the same velocity. Work it up again and enjoy shooting all that new alloy up.

[multigunner76]

Use a little less powder to get the same velocity. Work it up again and enjoy shooting all that new alloy up.

Your right, I typed more and was thinking less. Its time to step away from the bench tonight.

[boho]

Many things may need to be checked. Are they lighter because they lost diameter? Different alloy will cast different. If they're smaller you may need to adjust case mouth expansion and taper crimp. 7 grains weight shouldn't affect a red dot load more than 1\10. My 124 gr and 115 gr 9mm load are the same with no problems.

[multigunner76]

Diameter is spot on after running through the sizing die. I didnt check them to start with. Im sure its just the alloy

Boho, Love the sig line. Words to live by!!

[tomme boy]

Before you do anything else, go shoot it and see how it does. It might just surprise you. And also try some of the loads without running the bullets thru the sizing die. Make up a couple dummy rounds and see if they chamber. If they do, load a days worth of shooting that way and try them out.

Most if not all TL bullets shoot better if they are not sized. I like to double coat them with thinned alox. Just try a few this way.

[HATCH]

You are dealing with just a 6% difference in weight. If powder was linear then you would use 3.75 grains and be the same but its not.
I would try the same load and just see.

[zuke]

It's 7 grain's. Try your original load and see how it work's.

[44man]

Why bother? Just use the 124 loads, you do work loads for accuracy anyway, don't you?

[multigunner76]

The 9mm load I use has always been 4 Grains of Red Dot. It has always done what I wanted. No, I have not worked up this load for accuracy per say. I didnt need to I guess. May sound strange to yall but this load works for me and I didnt see a reason to change it. Im gonna load 10 of the lighter boolits with the original load and see what happens. I was just being cautious.

[captaint]

I would call it good, myself, and keep on shooting. That 7 grains light means next to nothing. 7 grains heavy might be worth a look at load data, but not 7 light. Mike

[mdi]

Like the fellers above mentioned, shoot them with the original charge. If I were to change anything it would be to go back to the starting load and load a few, then work back up t your 4.0 gr. load...

[boho]

Thanks gunner. Being a dad is the most important thing I've got going on!

[multigunner76]

Thanks gunner. Being a dad is the most important thing I've got going on!

Me and you both Brother

[gray wolf]

If you have not worked up the load for accuracy, then I doubt you will notice a 7 grain difference. ( really ) To try and change 1000 # of alloy probably will make you a tad crazy. All other parameters being equal the load should be safe. Shoot some and see what it does. For 7,10,15 and 20 yards it ain't gonna show a difference. You say the load is working for you, What does that mean ? Anyway if it does not make you happy then rework the load, what else it there to do ? Your not in a critical area from what you have said, over thinking ? perhaps. Give the old load a go.