.50bmg

If you look carefully at their site. They do not want to publish a STARTING load for .50BMG

Me, I take the max and use 75 % of that load has a starting point.

And I do not use my AX-50 for testing. A one shot rifle only.
 
This seems like an appropriate thread to post this in (hopefully not a repost, I didn't go through the whole thread)

 
This all I have so far for my serbu load development before winter kicked in.

H50BMG powder 26" barrel, 642-655 grain surplus bullets, IVI Match brass.

Grains - FPS

1) 225g - 2550 fps
2) 225 - 2602
3) 225 - 2536
4) 225 - 2547

5) 227.5 - 2584
6) 227.5 - 2495
7) 227.5 - 2494

8) 230 - 2575
9) 230 - 2559
10) 230 - 2581
 
Did you measure the grouping, any pictures ?

Very nice work.

I am not sure but, do you think shooting five (5) rounds is better for statistics than three 3(3) ?

I am curious, when you shot the second and third round did you use the semi-auto feature or one round at a time (slow fire versus rapid)
 
mrblue357 said:
This all I have so far for my serbu load development before winter kicked in.

H50BMG powder 26" barrel, 642-655 grain surplus bullets, IVI Match brass.

Grains - FPS

1) 225g - 2550 fps
2) 225 - 2602
3) 225 - 2536 MEAN = 2558.8, SD = 25.5
4) 225 - 2547

5) 227.5 - 2584
6) 227.5 - 2495 MEAN = 2524.3, SD = 42.2
7) 227.5 - 2494

8) 230 - 2575
9) 230 - 2559 MEAN = 2571.7, SD = 9.3
10) 230 - 2581
Click to expand...

I do not think we have enough data
 
mrblue357 said:
This all I have so far for my serbu load development before winter kicked in.

H50BMG powder 26" barrel, 642-655 grain surplus bullets, IVI Match brass.

Grains - FPS

1) 225g - 2550 fps
2) 225 - 2602
3) 225 - 2536
4) 225 - 2547

5) 227.5 - 2584
6) 227.5 - 2495
7) 227.5 - 2494

8) 230 - 2575
9) 230 - 2559
10) 230 - 2581
Click to expand...


The surplus pulled bullets can shoot sub MOA if you sort the ogives with a Sinclair Ogive comparator. I also size them through a lee sizer just to take down some of the pull marks. Swissin shot MOA at 700m with my loads of US-869 233.7 gr even more accurate I use H-50 BMG powder 237.5 gr seated to canalure groove with med crimp. Anneal every firing and after 4-6 reloads you will probably need to ream the neck out to remove donut at the neck shoulder junction. You can make your own bump die out of a lee FL die if you know someone with an EDM machine or special tooling.
 
DG Photography said:
The surplus pulled bullets can shoot sub MOA if you sort the ogives with a Sinclair Ogive comparator. I also size them through a lee sizer just to take down some of the pull marks. Swissin shot MOA at 700m with my loads of US-869 233.7 gr even more accurate I use H-50 BMG powder 237.5 gr seated to canalure groove with med crimp. Anneal every firing and after 4-6 reloads you will probably need to ream the neck out to remove donut at the neck shoulder junction. You can make your own bump die out of a lee FL die if you know someone with an EDM machine or special tooling.
Click to expand...

Which annealing machine do you use for .50BMG
 
stac50bmg said:
Did you measure the grouping, any pictures ?

Very nice work.

I am not sure but, do you think shooting five (5) rounds is better for statistics than three 3(3) ?

I am curious, when you shot the second and third round did you use the semi-auto feature or one round at a time (slow fire versus rapid)
Click to expand...

This is just a start of my load development. What I was looking for mostly was the velocity and to see if it would cycle reliably in the gun. Once I like where the velocity is at and the gun functions reliable I'll work on bettering my loads. All rounds were fired in semi but taking time in between shots.

DG Photography said:
The surplus pulled bullets can shoot sub MOA if you sort the ogives with a Sinclair Ogive comparator. I also size them through a lee sizer just to take down some of the pull marks. Swissin shot MOA at 700m with my loads of US-869 233.7 gr even more accurate I use H-50 BMG powder 237.5 gr seated to canalure groove with med crimp. Anneal every firing and after 4-6 reloads you will probably need to ream the neck out to remove donut at the neck shoulder junction. You can make your own bump die out of a lee FL die if you know someone with an EDM machine or special tooling.
Click to expand...

I just picked up the lee sizer but I'll look into getting the Ogive comparator. I'm not sure how many reloads I could get out of this brass, it gets scratched up pretty good after it gets cycled.
 
I would look into the head space/bump gauge comparator as well this will allow you to determine the least amount of resizing that still allows easy extraction. Inspect your brass closely depending on your load the brass will dent in different spots the easy fix is to put rubber or clear tubing on your charge handle some high speed video revealed this as the culprit! Keep your chamber nice and clean as well. If you are getting long vertical scratches this could be due to hard extraction as the case to chamber wall clearance is a little to snug on extraction sizing a few thou smaller will remedy this but can also shorten brass life annealing will help this though!
 
I'll keep a close eye on the brass for sure and look into getting those tools as well.

That's the first I've heard of that annealer, was going to get the grizzly one at some point but I like that one better.
 
mrblue357 said:
I'll keep a close eye on the brass for sure and look into getting those tools as well.

That's the first I've heard of that annealer, was going to get the grizzly one at some point but I like that one better.
Click to expand...

I had the Grizzly it was a nice unit! I bought a Bench Source and really like it best, Annealer I have come across. It cost me close to $600 with the .50 carrier plate as well.

Have you experienced case denting? Keep a close eye some are small but sharp could cause case failure. If you see dents just add some tubing to your charge handle or piece of MTB/MX grip.
 
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