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Discussion Starter · #1 ·
Today I tested the 338MX with TAC and AA2520 powders. Bullet used was the Hornady FTX 200 grains, and the cases where new bulk Hornady. Primers used were Remington 9-1/2. Temperature was 80-82 with the wind at 5mph. Chrony was 10 feet from tip of barrel, and I show the adjusted muzzle FPS. Each test was 6 shots, and all shots are at 100 yards. The scope was left as it was when sighted with factory ammo, and the POA was at the # 10 –X-. POI with factory ammo is 2.75-3.50 inches high dead center. The POI during today’s test would probably be better had I not been rushing. I had a .308 and a 45/70 on each side, and had to time my shots between them otherwise would get secondary blast Chrony errors. I show the Chrony results followed by target pics.
WARNING – THE LOADS SHOWN BELOW ARE FOR INFORMATION PURPOSES ONLY – DO NOT ATTEMPT TO LOAD WITH THEM AS YOU MUST FOLLOW THE VENDOR’S MANUAL INSTRUCTIONS. IF YOU DO SO, YOU DO AT YOUR OWN RISK.

TAC – 40.5 grains
2252
2173
2180
2182
2246
2222
Avg FPS = 2209, energy ft/lbs = 2168, std. dev = 32.28 & adj. muzzle FPS = 2215
In the pictures below you notice that POI is all over the place and to the right.



TAC – 41 grains
2283
2289
2276
2283
2204
2205
Avg FPS = 2257, energy ft/lbs = 2262, std. dev = 37.08 & adj. muzzle FPS = 2262
In these pictures the POI improved to the point that twice I almost had 2 shots in 1.



TAC – 41.5 grains
2284
2314
2265
2305
2250
2310
Avg FPS = 2288, energy ft/lbs = 2325, std. dev = 23.94 & adj. muzzle FPS = 2294
In these pictures it opens up again, but I think it was me rushing more that the load/rifle.



TAC – 42 grains
2284
2341
2338
2268
2313
2294
Avg FPS = 2306, energy ft/lbs = 2363, std. dev = 26.99 & adj. muzzle FPS = 2312
These are similar to the ones before. Too much rushing.



AA25-20 – 44.5 grains
2455
2462
2435
2423
2469
2480
Avg FPS = 2454, energy ft/lbs = 2675, std dev = 19.53 & adj. muzzle FPS = 2460
In these pictures it shows more like the factory results in that POI is much more centered it is higher and the groups are closer.

Oh oh….. I can just hear Hal saying that his Chrony is *%[email protected]$($} ;D ;D



AA2520 – 45 grains
2469
2496
2464
2454
2476
2501
Avg FPS = 2477, energy ft/lbs = 2725, std. dev = 16.83 & adj. muzzle FPS = 2483
In these pictures the grouping just got a littler tighter.



AA2520 – 45.5 grains
2516
2534
2516
2492
2523
2504
Avg FPS = 2514, energy ft/lbs = 2808, std. dev = 13.37 & adj. muzzle FPS = 2520
In the next two sets of pictures, I think it is again me rushing plus I’m getting tired from getting kicked (yes Hal, this one kicks ;)).



AA2520 – 46 grains
2523
2555
2543
2524
2530
2526
Avg FPS = 2534, energy ft/lbs = 2851, std. dev = 11.70 & adj. muzzle FPS = 2540
Same as picture before.



BTW, I had not pressure signs, although in a couple of occasions, ejection was somewhat sticky, and the bolt holding the lever turned loose. My initial impression from this test is that the rifle likes heavier loads as shown by results with higher FPS. It also seems to like AA2520 over TAC, although with 41 grains of TAC it did very well. I think I’ll try another ½ grain in both TAC and AA2520 next time at the range. I also want to try IMR3031. That is it, have a great w/e.
 

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Good info, shooting and pics Al! One can always count on details from you which helps all others with the same gun/caliber. Between you and Hal nobody should be wondering what powder, bullet combo they should try.

Good stuff. I take it nobody was punching holes in your targets for you today like they were me. Too much cross lane shooting going on where we were. ???
 

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Discussion Starter · #3 ·
Thanks Scott. It's fun doing it plus it is a good way to share information which is one the things, in addition to its members, that makes this forum so great. :D
 

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Thanks for posting your results. You and the other guys are definitely helping me since I only started reloading last year and then only for my 45-70. I am keeping notes and have all of the components needed for the .338 but have not started yet. I know to reduce your (and others) results and work my way up but the postings will certainly help me on my way to finding the right load for my rifle. I already have the AA2520 bought, I just have to find the time to get started. Keep up the good work :).
 

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Ok, Al, here we go again with the Chrony. 46.0 gr of AA2520 out of my gun averaged 2436 fps adjusted muzzle of 2442 fps with a SD of 12.5. I am right around 100 fps slower than you. Again, I got 2493 with that factory lot you and I both shot - 3110213. My 3 shot group is a bit tighter than yours, but I didn't have anyone shooting around me.




I don't really like the results of TAC. Maybe if you load up another .5 gr it will be better. It really seems to throw the shots off to the right. I'm going to bookmark this so I can refer to it again.
 

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1895Gunner said:
Good info, shooting and pics Al! One can always count on details from you which helps all others with the same gun/caliber. Between you and Hal nobody should be wondering what powder, bullet combo they should try.

Good stuff. I take it nobody was punching holes in your targets for you today like they were me. Too much cross lane shooting going on where we were. ???
Scott, I really, really hate it when other folks shoot my target. I ask them, in a less than nice manner, to stop it. I have had this happen a time or 2 at a crowded range in PA.

Al, I don't know how you can use the Chrony when there is that much shooting going on around you. I always go early in the morning and finish with the Chrony before the range gets crowded.
 

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Discussion Starter · #7 ·
Halwg said:
Al, I don't know how you can use the Chrony when there is that much shooting going on around you. I always go early in the morning and finish with the Chrony before the range gets crowded.
Unless I join a private club, and I'm not sure there is one around here, it is the way it is. As to getting there early, I did. I arrived at the range at 6:36am and I was second in line beating 3rd in line by about 45 seconds. Then 5 minutes later the 4th shooter arrived. Here in So. Fla we only have two public ranges - - - the one I go to which is to the North in Broward County and the other is all the way to the South about 50-60 miles away.
 
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