Yeah, I've seen it pretty often too, though sometimes it's the very first shot that greatly exceeds the rest of them. I generally keep my bores sparkling clean. Compact powders like magpro I like to keep at or near case capacity since unpredictable "funkiness" can ensue in ignition characteristics if there's much spare space. Assuming the cartridges are uniform, the only thing I can think of is temperature differences causing the velocity spikes (?).Stag that's what I'm experiencing with magpro. My first 4 shots will be within 25 fps then 1 60fps faster or slower. Drives me crazy.
If you're talking 280 AI--most definitely buy it, you won't find any 280 rem either. I assume your bergara receiver is more than likely reamed to Nosler's SAAMI-submitted spec. You may also want to contact Quality Cartridge and talk to the fellow there. If you need some additional quantity to make an order I could be talked into it as my collection of 280 AI brass is small and only going to hold out for so many more resizings.Found some new Nosler Brass for not too bad of a price. Should I snag 100 or hold out for Peterson?
I ran your numbers through QL compared to your original ones--it says you actually decreased your fill ratio--correspondingly pressure, velocity etc also dropped.seems like it wants to compressed. seated my bullets .020 deeper and it looked good until the 10th shot. I'll stay with this seating depth and up the charge some. I dropped down to 59.7gn. I'll let you know what happens. I still have about 9lbs of it.
Don't suppose you can pm where you found it? ; )Have 100 pieces of new Nosler inbound. Just need the action now.
DoneDon't suppose you can pm where you found it? ; )
Just out pf curiosity--I switched up to H4831 today and the results were pretty much the same, one shot out of each group was a way out deviation in velocity. So my conclusion is that there is either something wrong with my cartridges not being equalized or something in my set-up is changing pretty dramatically with warm up. I notice it's the first shot that usually is the "deviant"--but sometimes it's extra slow, other times it's extra fast. Magpro combined with the 180 to 185 gr VLDs makes for some very impressive velocity and energy, not really behind the 300 wby magnum by very much.Stag i dropped it to make sure i wasn't going overboard. I will start upping the charge now to see what happens.