Working on a .338 win mag for hunting primarily. I have other rifles that I use for practice/competition and I have always had good luck using my Magnetospeed to confirm velocity, then tweaking the BC to meet my mil data at 1,000 yds.
With this .338, I’m using a 210 grain Hammer Hunter. These are custom lathed solids copper bullets and the G7 is listed at .266. I’m getting great groups and low SD/ES at 2970 FPS with H4350 powder.
So I finally get everything together to do stretch it out and confirm BC. With a BC of .266 I was shooting high at 1,000 so I upped the BC until it matched how many mils I actually needed to hit center. I came up with a G7 of .320. That seems a little high and seemingly large departure from other BC corrections I’ve done in the past. For example, 143 ELD-X are listed at .315 BC and for my gun I corrected it to .310 to match my results. Not a big change.
Does this check out, or not worry about it and just make sure my velocity is correct and roll with whatever BC matches my results, regardless of how far it is from the listed BC?
With this .338, I’m using a 210 grain Hammer Hunter. These are custom lathed solids copper bullets and the G7 is listed at .266. I’m getting great groups and low SD/ES at 2970 FPS with H4350 powder.
So I finally get everything together to do stretch it out and confirm BC. With a BC of .266 I was shooting high at 1,000 so I upped the BC until it matched how many mils I actually needed to hit center. I came up with a G7 of .320. That seems a little high and seemingly large departure from other BC corrections I’ve done in the past. For example, 143 ELD-X are listed at .315 BC and for my gun I corrected it to .310 to match my results. Not a big change.
Does this check out, or not worry about it and just make sure my velocity is correct and roll with whatever BC matches my results, regardless of how far it is from the listed BC?
