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Journey to Stop Smoking!

yoderjac

5 year old buck +
I agree I wouldn’t get to discouraged about the accuracy yet. If I remember you are shooting the xtp mags which don’t seem to shoot as well for many. You may try a wad also if you would like to see any more accuracy.


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Good point. I've got lots of work to do once the Acumax bullets I plan to hunt with become available again. Last I heard it was supposed to be mid-May, but that has come and gone.

Thanks,

Jack
 

yoderjac

5 year old buck +
Finally! The Acumax .452s in 275 grain are available. I ordered 100 of them today. As soon as they arrive, I hope to get back to the range.

Thanks,

Jack
 

yoderjac

5 year old buck +
I also got some charge bottles with screw on tops since I was having leakage from the old White Hot pellet tubes I had saved. I spent some time tonight measuring out charges in them. Next, I checked out the Pittman bullets. They are something to behold. I sized a dozen of them and used the old White Hot tubes for them. I'm hoping to find time to get to the range tomorrow.

55d3cfc1-56b0-4f57-a072-f50d25297948.jpg


Thanks,

Jack
 

yoderjac

5 year old buck +
I made it to the range today with the Pittman bullets. I got perplexing results:

31480ec5-aef8-4927-ada3-186ba0d0176c.jpg


I have not fired the gun since my previous posts. These three shots were using a bull bag from a bench. When I loaded the first Pittman bullet, it was significantly harder to push down the barrel than my fowling shots. However, subsequent shots went down the barrel with very little force like before.

Shot 1 - 1508
Shot 2 - 1972
Shot 3 - 1468

Next, I decided to move the group.
bff982cf-419b-45cf-a107-bd2873efab83.jpg


I adjusted the scope windage before shot #4
Shot 4 - 1952

I adjusted the scope windage again before shot #5. I then decided to take 2 more shots after 5 to form a group.

Shot 5 - 1999
Shot 6 - 2214
Shot 7 - 2271

I was pretty happy with that group, so I decided to adjust elevation.

c0b8095b-7c3e-4280-b3a6-cfe59faec31b.jpg


Shot 8 - 2331

Ok, I obviously adjusted the wrong direction...So, let's try again.
eb862ff1-cb2e-4863-81fc-6483afea0ddd.jpg


Shot 9 - 2123

All in all, I'm quite happy. The perplexing part was the high deviation in velocities with the first few shots. The gun settled down quite nicely. I was taking my time between shots, walking to the target and numbering each shot to kill time and allow the barrel to cool. Could it be something about the bullets I was shooting to foul the barrel last time? Could have the slight heating increased velocity so consistently?

Thanks,

Jack
 

spaniel

5 year old buck +
So all of those shots were the same charge? Velocities from 1500 to 2300fps? That's a heck of a spread.

Remind me...you're sabotless...did you size under and knurl up or just try to size and shoot smooth? Easiest explanation for the spread if you didn't knurl is you can't size the bullets precisely enough to get equal pressure. It's been years but I think this is why people were sizing small and using coarse files to knurl the bullets back up to meeting the bore.
 

yoderjac

5 year old buck +
So all of those shots were the same charge? Velocities from 1500 to 2300fps? That's a heck of a spread.

Remind me...you're sabotless...did you size under and knurl up or just try to size and shoot smooth? Easiest explanation for the spread if you didn't knurl is you can't size the bullets precisely enough to get equal pressure. It's been years but I think this is why people were sizing small and using coarse files to knurl the bullets back up to meeting the bore.

Yes, the same charge within a grain or two. I was not super careful getting charges identical since this was my first go. It is quite possible that charge differences were a factor. I've since reloaded my charge tubes and they are now within about .5 grains. To me, it looks like the gun settled down after the first couple shots. I had previously shot other bullets to foul the barrel and the gun sat after that. I'm thinking there was oxidation in the barrel and the first few shots cleared it. Note that my first bullet was quite tight to load and took a lot of pressure. As I shot, it became much easier to load. I've since learned that after a shooting session, it is a good idea to pull the plug and run a brush down the barrel. So, for now, I'm blaming for the velocity spreads.

As for the bullets, I'm not far along yet to knurl bullets, and I have not tried using a sabot or wad yet. I'm a hunter, not a bench shooter, so my plan is to start with keeping things as simple as possible and then adjust as needed.

My plan going forward is to go take one shot and compare the impact point and velocity to the last shot of my previous session. I'll then run a brush down the barrel when it is warm and let the gun sit for a week or so. I'll then repeat that process and see how the first shot does as that is the important one. If I'm still having issues, velocity or accuracy, I'll look at more advanced techniques. Another possibility was barrel heating. I did wait between shots and walked to the target and labeled each shot to kill time and let the barrel cool. I did not use a brass cooling rod or anything like that.

In time, I may get to knurling bullets, but I hope I don't have to go that far.

Thanks for the suggestions,

Jack
 
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