About 4 years ago, I had similar issues with AR2217/H1000.
Since about 1998, I had being using a supply of H1000, which bizarrely was made by ADI in Oz, and imported by a Canberra gunshop from Hodgdon in the US. I believe the Oz equivalent AR2217 was not released by ADI in Oz until sometime well after 1998.
I had being using a load of 63.0 grains H1000 in my 25/06AI for about 7 years, and with the Nosler 115 grain BT it routinely delivered sub 0.5 moa at velocities ranging from 3240 to 3275.(depending on temp).
In April 2005, I purchased a 500 gram tin of AR 2217, as I was down to my last 20 shots loaded with my field load of 63.0/H1000. I was short on cases, so rather than work up from about 58 grains/2217, I decided to take the risk of loading 3 cases with 63.0 AR 2217. My first shot produced smoke from the bolt, 3482 fps on the chrono, and a blown primer once I hammered open the bolt with a rubber mallet.
I then fired 4 field loads (63.0/H1000) and recorded an average velocity of 3271 fps, and also fired loads of 61.0 and 62.0of Re 25. I have cut and pasted my chrono results below: Load: Winchester Cases, Remington 9 ½ M Primer, Nosler 115 grain Ballistic Tip - loaded length 3.235 Seating Depth .010 - .015 inches from lands.
63.0 Grains ADI AR 2217
1 3482 Blown Primer, Way over Maximum
2 Not Fired "
3 Not Fired " "
63.0 Grains Hodgdon 1000
1 3271 Near Max
2 3276 "
3 3266 "
4 3271 "
Ave 3271
Reloader 25
61.0 Grains
Shot FPS Remarks
1 3198 Pressure Near Max
2 3208 "
3 3248 "
Ave 3218
ES 50
62.0 grains Re 25
1 3293 Pressure Max
2 3293 "
3 3292 "
Ave 3293
Subsequent tests showed this lot of ADI AR 2217 is probably about 3 grains faster burning than the lot of Hodgdon 1000.
This represents about a 5% variation, which is probably within ADI's lot to lot variation tolerance.
Hope that the above is of interest. Brian