That might be making is a bit too simplistic. Assuming same bullet construction (lead, jacketed, copper) and similar shape, then yes. Using data for a lead bullet under a solid copper bullet could get you in trouble. Seating a long pointy round nose bullet to the same OAL as a wad-cutter or similarly very blunt profile bullet of the same weight could also potentially get you in trouble.Same weight ='s same data.
start low and work up
That might be making is a bit too simplistic. Assuming same bullet construction (lead, jacketed, copper) and similar shape, then yes. Using data for a lead bullet under a solid copper bullet could get you in trouble. Seating a long pointy round nose bullet to the same OAL as a wad-cutter or similarly very blunt profile bullet of the same weight could also potentially get you in trouble.
Anyone know why they did this?
I would be tempted to fill the cavity with a hard grease and see if that keeps the fouling down and the barrel cleaner.
I had no idea of the size of the hollow base on these bullets
https://www.berrysmfg.com/product/bp-9mm-356-115gr-hbrn-tp
View attachment 904285
Anyone know why they did this?
I would be tempted to fill the cavity with a hard grease and see if that keeps the fouling down and the barrel cleaner.
how is this for a concept from the past?
View attachment 904286
Increasing bearing surface length in a lightweight bullet.
Yes, BUT !!!All of the load data I see is for Berry's HBRN. Would the data be the same for flat base bullets?
Please explain.HB may have lower maximums powder charges then FB bullets.
FB maximum powder charges may be to much/high for a HB bullet.
I'm using Berry's RN with a flat base.Assuming the same weight and loaded to the same length or longer it should work fine. As usually best practice is to start low and work up when you make minor changes in a load like this. What specific bullet are you going to use. There may be data in other sources using that exact bullet.
That definitely helps. ThanksYes, BUT !!!
You need to understand the rules... Both bullets have the same weight and are of the same construction (plated lead). So they will use the same Load Data. But, they vary ever so slightly in their plating thickness, and of course barrel contact length, so there will be minor differences. All these minor differences will be found by beginning your load testing at lower loads and working up in small increments.
• If this is your first loading experience with Berry bullets, then we would insist you go all the way back to Starting Load.
• However, if you have previous experience and notes from the other Berry bullet, the differences are so minor between these 2 bullets that you may only need to step back 0.2gr from your previous loads.
In my testing the final loads came up as 0.1gr difference in my gun between the 2 Berry products. You'll need to do your own testing, or course, in your gun to verify.
Hope this helps.