.280 AI& monolithics

[Jokostel]

If you run an all copper projectile or a variant alloy similar to that near jam(hell any bullet for that matter)... and load shop, you get what you deserve.
I'm done with this thread. Done with you.

 

[ofdscooby]

Easy guys I apriciate all the input I usually start around .030 off for most my loads then find the right charge I just tweak the length a little to try and squeeze a little more accuracy out of them. With the Barnes I'll go a little farther off and start low in my charges and work up as anyone should do. I'll post up my results as soon as I can send some down range.

 

[ofdscooby]

Well the rifle is done will post up some pics shortly I'm more worried about performance right now took it out once for break in using 139 grain GMX's and IMR 4831 the higher I went with the charges the better it did but I ran out of powder space never showed any pressure signs so I'm back at it with Barnes 140 TSX's and 145 LRX's using IMR 4350 hopefully I'll get it tightened up. The groups with the GMX's went from about 2" and ended around and 1.25"
Weird thing is I'm having trouble getting and land marks on dummy rounds when trying to establish length to the lands I'll have to talk to my smith about that in Monday when I see him. I'll update on Monday I hate CA by the way for making me go through this!

 

[PGJPJ]

I ran some of my first 168 grn Barns LRX through my 280ai. I only did 6 rounds total, as I'm mainly working on a load for Berger 168 VLD.

I used RL 26, and at 57 grains, 2770 fps. 58 grains gave me 2820. Anyway, I was able to stabilize them, I'm running 1:8 twist barrel. Accuracy was a bit over 1 moa, nothing to write home about, but I didn't play with seating depth at all yet.

Anyway… just some data points. The 145 LRX also looks pretty cool. You'll find something that shoots. I think Oregon won't be too far behind CA.

 

[RockyMtnMT]

ofdscooby,

We have a 143g for the 9" twist and a 155g for a 8.5" twist. If you have some elevation helping you the 155g will work great. The 143g would be my first choice given your twist rate. I prefer full stabilization for any bullet. Our Hammer Hunter bullets are not particular about seating depth. You can seat them to whatever depth is most convenient for your set up. Because of our PDR (Parabolic Drag Reduction) design they do not have pressure issues that many mono's do. Our bullets are precision lathe turned so accuracy will not be an issue. We run our hollow points deep and use a copper alloy that is soft enough to work down to low velocity impacts yet able to handle any high velocity impact and maintain bullet integrity for deep penetration.

Give them a go, you won't be disappointed.

Steve

 

[ofdscooby]

here you go boys i think I found it on the second trip out with my .280 ai. Anyone just joining in this gun is my F.U. California gun and it will never see lead. First trip out wasn't very promising but it seemed to get tighter with 4831 in the higher charges so I dropped down to a faster powder and the same thing started to happen the higher the charge the tighter it got. I got my best group at 56.5 and then at 57.0 it opens back up. So time to load some more up get a read on the speed so i can stretch the legs a little.

first pic was of the first time out and the 139 gmx and IMR 4831

 

[PGJPJ]

I re ran the 168 grain LRX with RL 26. I'm still going to try a bit more charge, but accuracy is getting close. This is with a 0.050" jump