Just added popple holes to my gun, how much will load data change

[Glock17open]

I have a CK arms 9 major gun, that I added three popple holes to.  I am currently load 6.7 grns of WAC, a 124 grn Montana gold bullet. Winchester small pistol magnum primer. With an oal of 1.16.  My question is how much powder will I need to add to get back to my original PF.  Previous PF was 172. Thanks in advance.

[Glock17open]

I will be test with my Chrono graph this weekend.

[echotango]

Try the same and go up .1 at a time.  I went to 3x 3/16 holes from 3 1/8 and did not need that much.

[zzt]

Two 3/16" poppels dropped my major load from 172PF to 168.

 

The poppels make the gun run flatter, but rob the comp of gas.  I went with a much slower powder than WAC and ended up getting flatter AND softer.

[Glock17open]

2 hours ago, zzt said:

Two 3/16" poppels dropped my major load from 172PF to 168.

 

The poppels make the gun run flatter, but rob the comp of gas.  I went with a much slower powder than WAC and ended up getting flatter AND softer.

Thanks for your reply, I have 10 lbs of WAC. So it will be a while before I try a new powder.

[zzt]

23 minutes ago, Glock17open said:

Thanks for your reply, I have 10 lbs of WAC. So it will be a while before I try a new powder.

 

Use it for minor steel challenge loads.