For months I could do no wrong, average 0.4" 5 shots at 70 yd, averaging .95 MOA at 101 yds. Then the slugs changed. Most noticeable was that they no longer had the slimy mottled lube that so many found off-putting. Newer batches seem to have either a dark gray glossy coat or a lighter gray sticky coat, and they don't shoot worth a crap in my .22 Impact 700 mm despite trying various tunes.
This is a Davidson seating depth comparator. In the PB world we use these to set cartridge OAL. There are holes around the rim for different calibers; in the .22 hole is an NSA .217 23 gr slug. The tool measures where the diameter reaches nominal, where the ogive begins if you will, so that you can seat bullets to touch the lands of be off them by a given amount. With your calipers you measure from the base of the bullet to the opposite face. It's a .224 hole, of course, but .217 and .218 slugs won't drop through.
For the NSA slugs the measurement is 1.108". For the old slimy good-shooting H&N .218 23 gr it's 1.085-1.088. For the newer batches of the same .218 23 gr slug it's 1.094-1.098.
So maybe the seating depth is different. Maybe I should try the pin probe.
This is a Davidson seating depth comparator. In the PB world we use these to set cartridge OAL. There are holes around the rim for different calibers; in the .22 hole is an NSA .217 23 gr slug. The tool measures where the diameter reaches nominal, where the ogive begins if you will, so that you can seat bullets to touch the lands of be off them by a given amount. With your calipers you measure from the base of the bullet to the opposite face. It's a .224 hole, of course, but .217 and .218 slugs won't drop through.
For the NSA slugs the measurement is 1.108". For the old slimy good-shooting H&N .218 23 gr it's 1.085-1.088. For the newer batches of the same .218 23 gr slug it's 1.094-1.098.
So maybe the seating depth is different. Maybe I should try the pin probe.