.20 caliber Sierra Blitzking bullets

[SS427]

To be fair to Sierra I thought I should follow up my Zombie Max bullet post with this one.

I tested another Sierra 32 grain Blitzking load this weekend in my .20 VT and got better results. I dropped down to 18 grains of H4198 at four different seating depths, and while overall the results were not as good as the Z-max bullets at the same charge, the Sierra load that was .014 off hard jam was the best test load of all so far. Two three shot groups measured .226 and .180. I will load 50 of them at the same charge and seating depth and see how it does with five shot groups.

Something of interest, and I've never noticed this before, but both the Z-max and the Blitzkings shot the best at about the same depth away from hard jam. Anyone else ever see this when changing bullets? I wouldn't draw any conclusions from this but I will be paying attention in the future to how it works out.

[george ulrich]

Originally Posted by SS427

To be fair to Sierra I thought I should follow up my Zombie Max bullet post with this one.



Something of interest, and I've never noticed this before, but both the Z-max and the Blitzkings shot the best at about the same depth away from hard jam. Anyone else ever see this when changing bullets? I wouldn't draw any conclusions from this but I will be paying attention in the future to how it works out.

yes, pretty much same can vary for different barrels ( larger or smaller bore dia.s)

[montdoug]

If the ogive is the same distance from or into the lands and you've found the place the rifle likes it best you are repeating the same seating depth using lands to ogive and my experience is that the rifle will like all different brands of bullets seated there. Total OAL matters in relation to the magazine for feeding but almost every bullet make is a different length than the next and it's the measurement of where the ogive is in relationship to the lands that matters to load accuracy.
In my notes on a given rifle I always have it's bullet preference and preferred seating depth measured from the ogive first thing. Next I always include which comparator I used to do the measurement cause I have several. My 2cents .

[MrMajestic]

That's interesting Doug. I never thought about it but now need to experiment. Thanks.

[Alex]

...that the COL is affected by the bullet base to tip length, which is extremely (in the case of thousandths) important, especially with plastic tipped bullets, with respect to the ojive. Prove this to yourself by measuring a box of your favorites. You will find that the base to ojive is very consistent, the base to tip not nearly as much.


Benchrest shooters even measure the boattail depth!


When I first started reloading, this about drove me crazy.


Only other measurement of this type that has given me as much headache is the early differences in the 204 Ruger brass differences in the base to shoulder distance. Couldn't figure why I got such good groups with my once fired factor loaded reloads and my virgin brass reloads sucked.


The fix on this seems to have strongly affected the new 17HH factory loads. My CZ 17HH Varminter is so accurate with the Hornady factory stuff that with the little I have shot this past summer (moved to the city til the kids finish HS - driving me nuts!), although I bought a stack of Privi 22H brass, this rifle may end up following in the tracks of my 22 Hornet Micro Hunter from Browning and the way it shoots 35 gr VMax factory stuff.


Alex