New at reloading need opinion

[std7mag]

Big assumption that the bullet needs help to get engraved.

Really??
Most of the mono bullet manufacturers recommend to start with a jump of 0.05".

Why do you think that is?

 

[edix]

Thanks again everyone for responding. No i have not had any work done on the bolt. Never knew bushing was a thing. Factory loads the primers look very normal when shot. I don't understand how that would change just because of a hand load and a low powder load as well. Could I just have bad brass as well? This is new Alpha brass never shot. Even after resizing it does not fit. I do have this measuring tool not 100% sure if needed but again. I throw money at problems sometimes even if unnecessary.

 

[David Milisock]

Well that has been mentioned in post numbers 3, 9, 10, 15, 29, 31 and 32.

Well yes but the primers don't reflect an out of tune bolt. The ejector mark and the burnish marks on the case head seem to indicate the the bolt is not true to the case head.

I would assume that if the bolt was trued up that the pin bushing would jut be done at that time even though me and others have never needed that done even at 65,000 PSI.

 

[std7mag]

Question for you. Since more jump equals less internal case volume, which equals higher pressure, at what point is more jump a wash concerning pressure? I used COAL numbers back when I began reloading, circa 1970. What with all the different styles of bullets I think that tells me nothing. I am probably wrong.

If it was a pistol cartridge were talking about, absolutely I would worry about reducing the case volume by shortening the COAL.

But, since it's a ridle cartridge using much slower burning powder, the difference of 0.04" seating depth isn't that much of an issue.

At most you're looking at maybe 500-1,000 psi.
If you're that close to the ragged edge, you need to come down in powder charge anyway.

 

[Tommie]

OP's factory ammo does not crater, and i doubt they are using harder primers than a cci450 (what the OP was cratering)

Maybe. Maybe not. I’m not being argumentative. Really the primers look pretty darn rounded for an over-pressure situation. JMO.

 

[Webster]

Really??
Most of the mono bullet manufacturers recommend to start with a jump of 0.05".

Why do you think that is?

Don't really know. Common sense would tell you that traveling 22" down barrel would engrave a bullet. I would like to hear an explanation of what goes wrong if you don't have about 50 thou jump. Maybe for safety reasons they want to make sure the bullet doesn't stick in the barrel if you extract a round.

 

[Webster]

Really??
Most of the mono bullet manufacturers recommend to start with a jump of 0.05".

Why do you think that is?

I see nothing on the Hammer Bullet website about needing about 0.050" jump.
Below from the Hammer website.

Load Development​

A reputable ammunition loading manual should be consulted for load development using a particular powder. Always follow good loading practices outlined in your loading manual. Our PDR design will tend to have less pressure due to less bearing surface contact with the bore. We recommend looking for a powder showing fairly low load density for similar weight bullets, so as not to run into compressed loads. We also recommend using a magnum primer to start ignition more quickly in order to seal the chamber as the bullet enters the bore. As new highly efficient cartridges are entering the market, the use of standard large rifle primers has often proven to work better. Use of a chronograph to watch muzzle velocity compared to similar weight bullet velocity listed in loading manual will aid in load development. Muzzle velocity exceeding max load velocity listed for similar weight bullets in loading manual should be approached with caution. Muzzle velocity is an indication of pressure. Always watch for known pressure indicators such as heavy bolt lift or ejector marks on brass as well. We have found that Hammer Bullets® are not sensitive to seating depth. Seating to mag length for repeating rifles or just off the lands will generally work very well without need to adjust for better accuracy. Load development should be easy. Find your seating depth, choose your powder and primer, use start load data and work up your load to desired velocity, sight it in, and have fun hitting it with a Hammer.

 

[Benchrest Braxton]

Maybe. Maybe not. I’m not being argumentative. Really the primers look pretty darn rounded for an over-pressure situation. JMO.

i 100% agree with you.

I think there is something to be learned here with all of this. i told him to try the peterson brass and see if the issue goes away. I personally think the issue is the alpha brass being to small/hard to properly expand at the 0.200 line for his chamber.

 

[Ringostar]

Nobody has asked about primer size on the factory loads? I know that you’re using small rifle on your loads, but if the factory loaded ammo is large rifle that can explain the difference on cratering. I have an unbushed 700 that has no issue with large primers, but if I use small primer brass I get cratered primers. This could explain why you don’t see this with the factory loads. I’ve never tried machined bullets, so can’t offer anything on them.

 

[bozo699]

Primers are a poor way to look for pressure signs. However the ejector swipe is a pretty good indicator but the real way to tell if your over pressure is to measure the base of the case. You should see no more than .0005 expansion at the web.
Std7mag has a lot of experience with monolithic bullets, if I wanted to use them he would be the guy on this forum I would contact. I’m not a alpha fan like everyone else is but no matter if it’s not the monolithic bullets causing the problem I would check neck clearance in the chamber, if that’s good I would buy some Lapua Brass and see if the problem goes away I think you will find you have to tight of neck
Wayne