11-26-2023, 09:50 PM
Welcome to the forum.
Several questions need to be answered first...
1. Are you working up loads over a chrony to find what works for your barrel? So these 2 loads, they are results you obtained from your chrony workup?
2. Are you using bullet mfr or powder's mfr or published data, and starting out low and working up? Keep in mind that the published data is also based upon that source's actual barrel length, so may differ from what you have. Many sources are 24" barrels.
3. Elevation above sea level (ASL), temperature and even humidity can affect MV.
MV is affected by barrel length too but you show that as a 20" howa barel. I have shot them and they can be good shooters.
Copper bullets (the lehigh) are harder to seat against the lands so takes relatively more energy to do that, plus it is 10 gr heavier, so a lower MV for the lehigh vs the nosler would not be unexpected.
2480 for a 28.0 gr for a 100 grain cup/core like the Nosler 100, is less than the book max I show for that bullet.
I forgot what I used to use for lehigh's, I haven't shot them for quite a while.
Several questions need to be answered first...
1. Are you working up loads over a chrony to find what works for your barrel? So these 2 loads, they are results you obtained from your chrony workup?
2. Are you using bullet mfr or powder's mfr or published data, and starting out low and working up? Keep in mind that the published data is also based upon that source's actual barrel length, so may differ from what you have. Many sources are 24" barrels.
3. Elevation above sea level (ASL), temperature and even humidity can affect MV.
MV is affected by barrel length too but you show that as a 20" howa barel. I have shot them and they can be good shooters.
Copper bullets (the lehigh) are harder to seat against the lands so takes relatively more energy to do that, plus it is 10 gr heavier, so a lower MV for the lehigh vs the nosler would not be unexpected.
2480 for a 28.0 gr for a 100 grain cup/core like the Nosler 100, is less than the book max I show for that bullet.
I forgot what I used to use for lehigh's, I haven't shot them for quite a while.
"Down the floor, out the door, Go Brandon Go!!!!!"